JP6324374B2 - Cover for underground structure - Google Patents

Description

The present invention relates to a lid for an underground structure including a lid main body and a receiving frame that supports the lid main body so that the lid main body can be opened and closed.
As used herein, the term “underground structure lid” refers to a manhole cover, large iron cover, sewage culm lid that can be opened and closed so that an opening through the ground can be opened and closed. , Openable openable gutter lids, power transmission lids, power distribution iron lids, underground conduits in waterworks and gas pipes and their associated equipment and ground Fire hydrant lids, water control valve lids, gate valve lids, air valve lids, gas piping lids, water meter lids, etc. that function as open / close doors that connect

  Conventionally, as a lid for an underground structure, the outer diameter of the lid body is slightly smaller than the inner diameter of the receiving frame, and the outer peripheral portion of the lid main body and the inner peripheral portion of the receiving frame are substantially vertical surfaces and protrude from the inner periphery of the receiving frame. The thing of the flat receiving structure which supports the bottom face of a lid | cover main body with the made shelf part is known. In addition, the outer diameter of the lid body and the inner diameter of the receiving frame are made the same diameter, and the outer peripheral portion of the lid body and the inner peripheral portion of the receiving frame are formed with a steep slope downwardly, and the lid body is used as the receiving frame. The thing of the gradient receiving structure made to bite in is known.

However, in an underground structure lid with a flat receiving structure, the outer diameter of the lid body is slightly smaller than the inner diameter of the receiving frame, so that there is a gap between the outer peripheral portion of the lid main body and the inner peripheral portion of the receiving frame. There is. For this reason, when the vehicle repeatedly passes over the lid for the underground structure, the bottom surface of the lid body and the top surface of the shelf of the receiving frame may wear, and the lid body may rattle, generate vibration, and noise. It was.
On the other hand, as a lid for an underground structure with a gradient receiving structure, Patent Document 1 discloses that the inclination angle with respect to the vertical of the gradient surface of the outer peripheral portion of the lid body and the gradient surface of the inner peripheral portion of the receiving frame is 5 ° to 10 °. While limiting, the height of the gradient surface of the outer peripheral part of a cover main body is made smaller than the height of the gradient surface of the inner peripheral part of a receiving frame. In the thing of patent document 1, by limiting the angle of an inclined surface as mentioned above, the sufficient biting force with respect to the receiving frame of a lid body can be ensured, and the shakiness, vibration, and noise of a lid body are remarkable. In addition to being able to suppress, it is possible to produce an effect that the lid body hardly slides up.

JP-A-53-72357

However, in the underground structure lid described in Patent Document 1, although the above-described effect is exhibited, depending on the installation environment, an excessive biting force to the receiving frame of the lid body may be generated. When opening the lid, a lot of labor may be required, and the opening operation may be difficult.
Accordingly, the problem to be solved by the present invention is that the lid body can be prevented from rattling, vibration, and noise, and an excessive bite force to the receiving frame of the lid body can be prevented to generate an appropriate amount of labor. It is an object of the present invention to provide a lid for an underground structure that can be opened with a lid and can prevent the lid body from sliding up with respect to the receiving frame.

In order to solve this problem, a lid for an underground structure according to the present invention is a lid for an underground structure that includes a lid body and a receiving frame that supports the lid body so as to be openable and closable at an inner periphery thereof. The inner peripheral portion has a flat receiving-shaped receiving frame support portion and a receiving frame first surface portion formed by reducing the diameter toward the lower portion of the receiving frame with a gradient below the receiving frame support portion, and the outer peripheral portion of the lid body is The lid flat receiving portion supported by the receiving frame supporting portion, and below the lid flat receiving portion, vertically toward the lower portion of the lid main body, or toward the lower portion of the lid main body with a steep gradient than the first surface portion of the receiving frame. The lid has a first surface portion formed with a reduced diameter, and in the closed state of the lid body, the lid flat receiving portion is supported by the receiving frame supporting portion, and the lid first surface portion and the receiving frame first surface portion are Pressing each other by pressing force due to elastic deformation of at least one of the outer periphery of the lid body and the inner periphery of the receiving frame Is, the inner peripheral portion of the outer peripheral portion and / or the receiving frame of the lid body, a plurality of notch and / or a plurality of through-holes in the circumferential direction, a plurality of notch and / or a plurality of through-holes is It is provided in the outer peripheral part of the lid main body located below from the lid first surface part and / or the inner peripheral part of the receiving frame located downward from the receiving frame first surface part .
Further, the lid for an underground structure of the present invention is a lid for an underground structure including a lid body and a receiving frame that supports the lid body so as to be openable and closable at an inner peripheral portion, and the inner peripheral portion of the receiving frame is a flat surface. A receiving frame supporting portion; and a receiving frame first surface portion formed by reducing the diameter toward the lower side of the receiving frame with a gradient below the receiving frame supporting portion, and the outer peripheral portion of the lid body is supported by the receiving frame supporting portion. The lid flat receiving portion is formed, and the diameter of the lid flat receiving portion is reduced vertically toward the lower portion of the lid main body or with a steeper slope than the first surface portion of the receiving frame toward the lower portion of the lid main body. The lid flat surface receiving portion is supported by the receiving frame supporting portion in the closed state of the lid main body, and the lid first surface portion and the receiving frame first surface portion are the outer peripheral portion of the lid main body and At least one of the inner peripheral portions of the receiving frame is pressed against each other by the pressing force due to elastic deformation, and from the lid first surface portion The inner peripheral portion of the receiving frame from the outer peripheral portion and / or the receiving frame first face of the cover body located below located towards is characterized by formed by protruding portions which has a plurality of protruding at intervals in the circumferential direction.

  Further, the lid for an underground structure of the present invention is a lid for an underground structure including a lid body and a receiving frame that supports the lid body so as to be openable and closable at an inner peripheral portion, and the inner peripheral portion of the receiving frame is a flat surface. A receiving frame supporting portion, a receiving frame first surface portion formed by reducing the diameter toward the lower portion of the receiving frame with a gradient below the receiving frame supporting portion, and a gradient different from the receiving frame first surface portion below the receiving frame first surface portion. A receiving frame second surface portion formed by reducing the diameter toward the lower side of the receiving frame, and the outer peripheral portion of the lid body includes a lid flat receiving portion supported by the receiving frame supporting portion, and a lower portion of the lid flat receiving portion. The lid first surface portion formed by reducing the diameter vertically toward the lower side of the lid body or with a steep slope than the first surface portion of the receiving frame, and the lid under the lid first surface portion. A lid second surface portion formed by reducing the diameter toward the lower side of the lid body with a gradient different from that of the first surface portion; In the closed state of the lid body, the lid flat receiving portion is supported by the receiving frame supporting portion, and at least one of the lid first surface portion and the lid second surface portion, the receiving frame first surface portion, and the receiving frame second surface portion. At least one of them is pressed against each other by a pressing force generated by elastic deformation of at least one of the outer peripheral portion of the lid main body and the inner peripheral portion of the receiving frame.

Further, the lid for an underground structure of the present invention is a lid for an underground structure including a lid body and a receiving frame that supports the lid body so as to be openable and closable at an inner peripheral portion, and the inner peripheral portion of the receiving frame is a flat surface. A receiving frame support portion, a receiving frame first surface portion formed below the receiving frame support portion, and a lower portion of the receiving frame first surface portion, extending vertically downward toward the receiving frame or with a gradient toward the lower portion of the receiving frame. The outer peripheral portion of the lid main body is a lid flat receiving portion supported by the receiving frame support portion, and a lid first surface portion formed below the lid flat receiving portion. And a lid third surface portion that is formed to expand vertically toward the lower side of the lid main body or with a gradient toward the lower side of the lid main body below the lid first surface portion. In the closed state, the lid flat receiving portion is supported by the receiving frame supporting portion, and the lid third surface portion and the receiving frame third surface portion are outside the lid main body. Are pressed together by a pressing force according to at least one of the elastic deformation of the inner peripheral portion of the parts and receiving frame, the inner peripheral portion of the outer peripheral portion and / or the receiving frame of the lid body, a plurality of circumferentially notch and / or A plurality of notches and / or a plurality of through-hole portions of the outer periphery of the lid body located below the first surface portion of the lid and / or the receiving frame located lower than the first surface portion of the receiving frame. It is provided in the periphery .
Further, the lid for an underground structure of the present invention is a lid for an underground structure including a lid body and a receiving frame that supports the lid body so as to be openable and closable at an inner peripheral portion, and the inner peripheral portion of the receiving frame is a flat surface. A receiving frame support portion, a receiving frame first surface portion formed below the receiving frame support portion, and a lower portion of the receiving frame first surface portion, extending vertically downward toward the receiving frame or with a gradient toward the lower portion of the receiving frame. The outer peripheral portion of the lid main body is a lid flat receiving portion supported by the receiving frame support portion, and a lid first surface portion formed below the lid flat receiving portion. And a lid third surface portion that is formed to expand vertically toward the lower side of the lid main body or with a gradient toward the lower side of the lid main body below the lid first surface portion. In the closed state, the lid flat receiving portion is supported by the receiving frame supporting portion, and the lid third surface portion and the receiving frame third surface portion are outside the lid main body. Receiving frame positioned below the outer peripheral part of the lid body and / or the receiving frame first surface part, which are pressed together by the pressing force caused by elastic deformation of at least one of the inner part and the inner peripheral part of the receiving frame The inner peripheral portion is formed by a plurality of protruding portions protruding at intervals in the circumferential direction.

Preferably, the outer peripheral portion of the lid body has a lid fourth surface portion formed by reducing the diameter toward the lower side of the lid body with a gradient of the same angle as the receiving frame first surface portion below the lid third surface portion.
Preferably, when the lid main body is first placed in the receiving frame to be in the closed state, the outer peripheral surface or the lower surface of the outer peripheral portion of the lid main body and the inner peripheral surface of the inner peripheral portion of the receiving frame abut, The outer peripheral part and / or the inner peripheral part of the receiving frame are plastically deformed in a state in which a pressing force due to elastic deformation remains.

Preferably, a plurality of notches and / or a plurality of through holes are provided in the circumferential direction on the outer peripheral portion of the lid body and / or the inner peripheral portion of the receiving frame.
Preferably, the plurality of cutout portions and / or the plurality of through-hole portions are provided on the outer peripheral portion of the lid main body located below the lid first surface portion and / or the inner peripheral portion of the receiving frame located below the first frame surface portion of the receiving frame. ing.

In the underground structure lid of the present invention, the outer peripheral portion of the lid main body located below the lid first surface portion and / or the inner peripheral portion of the receiving frame located below the first frame surface portion are spaced apart in the circumferential direction. It is characterized in that it is formed by a plurality of projecting portions that are opened and protruded.
Preferably, a recess is provided at the base end of the protrusion so as to surround the protrusion.
Preferably, a reinforcing rib is provided on the back surface of the lid body, and an end portion of the reinforcing rib is separated from the inner peripheral wall of the outer peripheral portion of the lid body.

According to the present invention, in the closed state of the lid body, the weight of the lid body and the load applied when the vehicle or the like travels on the lid body are supported by the flat receiving frame support portion. It is possible to prevent an excessive biting force from being generated in the receiving frame.
Specifically, the lid first surface portion and the receiving frame first surface portion, or at least one of the lid first surface portion and the lid second surface portion, and at least one of the receiving frame first surface portion and the receiving frame second surface portion are included. Alternatively, the lid third surface portion and the receiving frame third surface portion are pressed against each other by a pressing force caused by elastic deformation of at least one of the outer peripheral portion of the lid main body and the inner peripheral portion of the receiving frame, and thereby the radial movement of the lid main body Is suppressed. Furthermore, when the lid body tries to move in the up and down direction, due to the pressing force, between the lid first surface portion and the receiving frame first surface portion, or at least one of the lid first surface portion and the lid second surface portion, A frictional force is generated between at least one of the receiving frame first surface portion and the receiving frame second surface portion, or between the lid third surface portion and the receiving frame third surface portion, and the movement of the lid main body in the vertical direction is also suppressed. The Therefore, it is possible to prevent an excessive biting force from being generated on the receiving frame of the lid body and to prevent the lid body from being loosened by the pressing force and the frictional force generated between the outer peripheral portion of the lid main body and the inner peripheral portion of the receiving frame. Sticking, vibration, noise and sliding can be suppressed.

It is a disassembled perspective view of the lid | cover for underground structures which concerns on this invention. It is a longitudinal cross-sectional view of the principal part of the lid | cover for underground structures which concerns on Example 1 of this invention. It is a longitudinal cross-sectional view of the principal part in the closed state which supported the cover main body of the cover for underground structures based on Example 1 of this invention with the receiving frame. It is a side view of the lid body of the lid for underground structures concerning Example 1 of the present invention. It is the top view which looked at the lid body of the lid for underground structures concerning Example 1 of the present invention from the back. It is a side view of the lid body of the cover for underground structures which concerns on another Example of this invention. It is a longitudinal cross-sectional view of the principal part of the lid | cover for underground structures which concerns on another Example of this invention. It is a longitudinal cross-sectional view of the principal part of the lid | cover for underground structures which concerns on Example 2 of this invention. It is a longitudinal cross-sectional view of the principal part in the closed state which supported the cover main body of the cover for underground structures based on Example 2 of this invention with the receiving frame. It is a longitudinal cross-sectional view of the principal part of the lid | cover for underground structures which concerns on Example 3 of this invention. It is the longitudinal cross-sectional view of the principal part which showed the state which the lid | cover 3rd surface part contact | abutted to the receiving frame 1st surface part in the middle of the closure of the lid | cover for underground structures which concerns on Example 3 of this invention. It is a longitudinal cross-sectional view of the principal part in the closed state which supported the cover main body of the cover for underground structures based on Example 3 of this invention with the receiving frame. It is a longitudinal cross-sectional view of the principal part of the lid | cover for underground structures which concerns on Example 4 of this invention. It is the longitudinal cross-sectional view of the principal part which showed the state which the cover 4th surface part contact | abutted to the receiving frame 1st surface part in the middle of the closure of the cover for underground structures which concerns on Example 4 of this invention. It is a longitudinal cross-sectional view of the principal part in the closed state which supported the cover main body of the cover for underground structures based on Example 4 of this invention with the receiving frame. It is a longitudinal cross-sectional view of the principal part of the lid | cover for underground structures which concerns on Example 5 of this invention. It is the perspective view of the principal part which looked at the lid body of the lid for underground structures concerning Example 5 of the present invention from the back. It is a longitudinal cross-sectional view of the principal part in the closed state which supported the cover main body of the cover for underground structures which concerns on Example 5 of this invention with the receiving frame.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the lid for an underground structure according to the present invention includes a lid body 10 and a receiving frame 30 that supports the lid body 10 so that the lid body 10 can be opened and closed at an inner peripheral portion. Are connected by a hinge hardware (not shown). The lid for the underground structure is formed of spheroidal graphite cast iron, and is attached to, for example, the upper end portion of the upper side lump of the manhole via a foundation adjustment portion, and the upper surface 14 of the lid body 10 is flush with the ground surface. Installed.
<Example 1>

FIG. 2 is a longitudinal cross-sectional view of the main part of the underground structure lid according to Embodiment 1 of the present invention. The inner peripheral surface 34 formed on the inner peripheral portion 31 of the receiving frame 30 includes a flat receiving-shaped receiving frame support portion 40 continuous with the upper surface 36 of the receiving frame 30, and a receiving frame first surface portion 42 below the receiving frame support portion 40. ing.
The receiving frame support portion 40 forms a vertical surface 37 continuous from the upper surface 36 of the receiving frame 30 toward the lower side of the receiving frame 30, and an annular flat surface that is flat in the radial direction of the receiving frame 30, that is, in the horizontal direction, below the vertical surface 37. 38 is formed.

The receiving frame first surface portion 42 is formed to be reduced in diameter toward the lower side of the receiving frame 30 with a gradient below the receiving frame support portion 40. Specifically, the gradient of the receiving frame first surface portion 42 is a range in which the angle with respect to the vertical (α in FIG. 2) is 1 ° to 10 °, and in this embodiment, the gradient α is 2 °. ing. The “gradient” used in the following description is defined as an angle with respect to the vertical.
On the other hand, the outer peripheral surface 12 formed on the outer peripheral portion 11 of the lid main body 10 includes a lid flat receiving portion 16 continuous with the upper surface 14 of the lid main body 10 and a lid first surface portion 18 below the lid flat receiving portion 16. ing.

The lid flat receiving part 16 forms a continuous vertical surface 15 from the upper surface 14 of the lid body 10 toward the lower side of the lid body 10, and an annular flat surface that is flat in the radial direction of the lid body 10, that is, in the horizontal direction, below the lid surface 10. A surface 19 is formed.
The lid first surface portion 18 is formed with a diameter decreasing toward the lower side of the lid main body 10 with a steeper slope than the receiving frame first surface portion 42 below the lid flat receiving portion 16. Specifically, the lid first surface portion 18 forms the gradient β in the range of 0 ° to 9 °. In the present embodiment, the lid first surface portion 18 has a gradient β of 1 °.

When the lid main body 10 is placed in the receiving frame 30 from the state of FIG. 2, the lower side of the lid first surface portion 18 and the lower side of the receiving frame first surface portion 42 start to contact each other. Further, when the lid main body 10 is placed in the receiving frame 30 and the closed state shown in FIG. 3 is reached, at least one of the outer peripheral portion 11 of the lid main body 10 and the inner peripheral portion 31 of the receiving frame 30 is elastically deformed or pressed by elastic deformation. The plastic body is plastically deformed with the pressure remaining, and the lid body 10 is placed in the normal lid position of the receiving frame 30.
Note that “elastic deformation” used in the following description is defined as a concept including plastic deformation in a state where a pressing force due to elastic deformation remains.

  In the case of the present embodiment, as shown in FIG. 3, the outer peripheral portion 11 of the lid body 10 is greatly deformed so as to be reduced in diameter from the state indicated by the broken line in the radial direction indicated by the solid line. Strictly speaking, the inner peripheral portion 31 of the receiving frame 30 is also elastically deformed. However, in this embodiment, the inner peripheral portion 31 is slightly smaller than the elastic deformation of the outer peripheral portion 11 of the lid body 10, so FIG. In the description of the example, the elastic deformation of the inner peripheral portion 31 of the receiving frame 30 is omitted. The same applies to any of the following embodiments.

  In the closed state shown in FIG. 3, the lid flat receiving portion 16 is supported by the receiving frame supporting portion 40, so that the weight of the lid main body 10 and the load applied by the vehicle traveling on the lid main body 10 are supported by the receiving frame. Supported by part 40. Furthermore, the lower part of the lid first surface part 18 and the lower part of the receiving frame first surface part 42 come into contact with each other, and the lid first surface part 18, the receiving frame first surface part 42, and the like are pressed by the elastic deformation of the outer peripheral part 11 of the lid body 10. Are pressed against each other.

The pressing force in this case is a restoring force generated when the outer peripheral portion 11 of the lid body 10 is elastically deformed by a deflection amount δ from the natural state of FIG. 2, and from the lid first surface portion 18 to the receiving frame first surface portion 42. On the other hand, the action part P acts in the diameter increasing direction of the lid body 10.
As described above, in this embodiment, when the lid body 10 is in the closed state, the weight applied by the weight of the lid body 10 and the vehicle traveling on the lid body 10 is supported in the flat receiving frame support portion 40. It is possible to prevent an excessive biting force from being generated on the receiving frame 30 of the lid body 10. Furthermore, the movement of the lid body 10 in the radial direction is suppressed by pressing the lid first surface portion 18 and the receiving frame first surface portion 42 with each other by the pressing force due to the elastic deformation of the outer peripheral portion 11 of the lid body 10.

  Further, in the closed state, a pressing force due to elastic deformation of the outer peripheral portion 11 of the lid main body 10 acts, so that when the lid main body 10 tries to move in the vertical direction, the lid first surface portion 18 and the receiving frame first A frictional force is generated between the first surface portion 42 and the movement of the lid body 10 in the vertical direction is suppressed. Therefore, it is possible to prevent the excessive biting force of the lid main body 10 from being received into the receiving frame 30 by the flat receiving-shaped receiving frame support portion 40 and the lid flat receiving portion 16. Furthermore, rattling, vibration, noise, and sliding of the lid main body 10 can be suppressed by the pressing force and frictional force generated between the outer peripheral portion 11 of the lid main body 10 and the inner peripheral portion 31 of the receiving frame 30. .

  In this embodiment, the inherent elastic coefficient of the outer peripheral portion 11 of the lid main body 10 and the sectional modulus of the outer peripheral portion 11 of the lid main body 10, and the intrinsic elastic coefficient of the inner peripheral portion 31 of the receiving frame 30 and the inner periphery of the receiving frame 30 are described. By setting the section modulus of the portion 31, the outer peripheral portion 11 of the lid body 10 is greatly elastically deformed. However, the present invention is not limited to this, and setting the inner peripheral portion 31 of the receiving frame 30 to be elastically deformed greatly also causes both the outer peripheral portion 11 of the lid body 10 and the inner peripheral portion 31 of the receiving frame 30 to be elastically deformed appropriately. Can also be set.

  Here, in this embodiment, in the closed state, an annular gap G1 is formed between the lid first surface portion 18 and the receiving frame first surface portion 42, and the lower portion of the lid first surface portion 18 and the receiving frame first surface portion 42 are formed. The bottom is in contact with the bottom. However, the present invention is not limited to this, and the elastic modulus of the outer peripheral portion 11 of the lid main body 10 and the inner peripheral portion 31 of the receiving frame 30, the diameter size and the angle of the outer peripheral surface 12 of the lid main body 10 and the inner peripheral surface 34 of the receiving frame 30 are set. The contact state between the lid first surface portion 18 and the receiving frame first surface portion 42 can be controlled. For example, in the closed state, due to elastic deformation of the outer peripheral portion 11 of the lid body 10 and the inner peripheral portion 31 of the receiving frame 30, the lid first surface portion 18 and the receiving frame first surface portion 42 are in contact with each other, and the annular gap G1 is not formed. There may be cases.

  In addition, in any of Embodiment 5 to be described later from this embodiment, when the lid body 10 is first closed by the receiving frame 30, the outer peripheral surface 12 or the lower surface of the outer peripheral portion 11 of the lid main body 10 and the inside of the receiving frame 30 By contacting the inner peripheral surface 34 of the peripheral portion 31, both or one of the outer peripheral portion 11 of the lid main body 10 and the inner peripheral portion 31 of the receiving frame 30 is forcibly forced in a state in which a pressing force due to elastic deformation remains. When the plastic deformation is performed, a dimensional error of the outer peripheral surface 12 of the outer peripheral portion 11 of the lid main body 10 and the inner peripheral surface 34 of the inner peripheral portion 31 of the receiving frame 30 can be absorbed without generating an excessive pressing force. Therefore, strict dimensional accuracy management of the outer peripheral surface 12 of the outer peripheral portion 11 of the lid main body 10 and the inner peripheral surface 34 of the inner peripheral portion 31 of the receiving frame 30 is not required, and the manufacturing cost can be greatly reduced. Furthermore, by leaving a pressing force due to elastic deformation between the outer peripheral portion 11 of the lid main body 10 and the inner peripheral portion 31 of the receiving frame 30, it is possible to prevent the lid main body 10 from being unexpectedly opened due to vehicle passage or the like at all times. In the opening operation, the operator can easily open the lid body 10.

As shown in FIGS. 2, 3, and 5, for example, lattice-shaped reinforcing ribs 22 are disposed on the back surface 20 of the lid body 10 of this embodiment. The end 24 of the reinforcing rib 22 is separated from the inner peripheral wall 13 of the outer peripheral portion 11 of the lid main body 10 so that the elastic deformation of the outer peripheral portion 11 of the lid main body 10 is not hindered when the lid main body 10 is placed in the receiving frame 30. It is preferable.
As shown in FIG. 4, a plurality of notches 48 are arranged in the outer peripheral portion 11 of the lid main body 10 of the present embodiment in a slit shape in the circumferential direction, for example, on the lid first surface portion 18 at substantially equal intervals. . By disposing the plurality of notches 48 in the slit shape on the outer peripheral portion 11 of the lid main body 10, the rigidity of the outer peripheral portion 11 of the lid main body 10 is lowered, so that the outer peripheral portion 11 of the lid main body 10 is further elastically deformed. It can be promoted and is suitable.

In the present embodiment, the plurality of cutout portions 48 are formed in the outer peripheral portion 11 of the lid body 10 in a slit shape, but the present invention is not limited thereto, and the plurality of cutout portions 48 are formed in the inner peripheral portion 31 of the receiving frame 30. For example, the receiving frame first surface portion 42 may be formed by notching a slit at substantially equal intervals in the circumferential direction. In this case, the elastic deformation of the inner peripheral portion 31 of the receiving frame 30 can be further promoted.
Further, the shape of the notch is not limited to the slit shape, and may be a substantially T-shaped notch 48 as shown in FIG. In order to further promote the elastic deformation of the outer peripheral portion 11 of the lid main body 10 and the inner peripheral portion 31 of the receiving frame 30, the through-hole portion 49 may be used instead of the notched portion 48. In FIG. A part thereof is a through-hole portion 49 having a window frame shape.

In the present embodiment, the receiving frame first surface portion 42 is continuously formed below the flat surface 38 of the receiving frame support portion 40, and the lid first surface portion 18 is continuously formed below the flat surface 19 of the lid flat receiving portion 16. Forming. However, the present invention is not limited to this, and as shown in FIG. 7, an R curved surface portion 41 is formed between the receiving frame support portion 40 and the receiving frame first surface portion 42, or the lid flat receiving portion 16 and the lid first surface portion 18 are The lid flat receiving portion 16 and the lid first surface portion 18 or the receiving frame support portion 40 and the receiving frame first surface portion 42 may be continuously formed with a smooth curved surface, such as forming an R curved surface portion 17 therebetween. In addition, an inclined surface such as a chamfer may be formed instead of the R curved surface portions 41 and 17.
<Example 2>

FIG. 8 is a longitudinal cross-sectional view of the main part of the underground structure lid according to Embodiment 2 of the present invention. In addition, about the location which overlaps with Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.
The inner peripheral surface 34 formed on the inner peripheral portion 31 of the receiving frame 30 of the present embodiment includes a flat receiving-shaped receiving frame support portion 40 continuous with the upper surface 36 of the receiving frame 30, and a receiving frame first surface portion 42 below the receiving frame support portion 40. And a receiving frame second surface portion 66 below the receiving frame first surface portion 42.

  The receiving frame first surface portion 42 is formed to be reduced in diameter toward the lower side of the receiving frame 30 with a gradient below the receiving frame support portion 40. In addition, the receiving frame second surface portion 66 is formed with a diameter reduced toward the lower side of the receiving frame 30 with a different gradient from the receiving frame first surface portion 42 below the receiving frame first surface portion 42. Specifically, the receiving frame first surface portion 42 forms a gradient α in the range of 1 ° to 10 °, and the receiving frame second surface portion 66 has the same orientation as the receiving frame first surface portion 42 but a different gradient α1 from 0 °. Largely formed. In the present embodiment, the receiving frame first surface portion 42 is formed with a gradient α of 8 °, and the receiving frame second surface portion 66 is formed with a gradient α1 of 6 ° that is steeper than the receiving frame second surface portion 42.

On the other hand, the outer peripheral surface 12 formed on the outer peripheral portion 11 of the lid main body 10 includes a lid flat receiving portion 16 continuous with the upper surface 14 of the lid main body 10, a lid first surface portion 18 below the lid flat receiving portion 16, and a lid. It is composed of a lid second surface portion 68 below the first surface portion 18.
The lid first surface portion 18 is formed with a diameter decreasing toward the lower side of the lid main body 10 with a steeper slope than the receiving frame first surface portion 42 below the lid flat receiving portion 16. Further, the lid second surface portion 68 is formed below the lid first surface portion 18 by reducing the diameter toward the bottom of the lid body 10 with the same orientation as the lid first surface portion 18 but with a different gradient. Specifically, the lid first surface portion 18 forms the gradient β in the range of 0 ° to 9 °, and the lid second surface portion 68 forms the gradient β1 larger than 0 °. In this embodiment, the lid first surface portion 18 is formed with a gradient β of 3 °, and the lid second surface portion 68 is formed with a gradient β1 of 6 ° that is a gentler gradient than the lid first surface portion 18.

  When the lid body 10 is placed in the receiving frame 30 from the state of FIG. 8, the lid second surface portion 68 and the receiving frame first surface portion 42 first start contact, and then the lid second surface portion 68 and the receiving frame second surface portion 66. Begins to abut. Further, when the lid main body 10 is placed in the receiving frame 30 and the closed state shown in FIG. 9 is reached, at least one of the outer peripheral portion 11 of the lid main body 10 and the inner peripheral portion 31 of the receiving frame 30 is elastically deformed, and the lid main body 10 is received by the receiving frame. Fits in 30 regular lid positions.

  In the closed state shown in FIG. 9, the lid flat receiving portion 16 is supported by the receiving frame supporting portion 40, so that the weight of the lid main body 10 and the load applied by the vehicle traveling on the lid main body 10 are supported by the receiving frame. Supported by part 40. Furthermore, a substantially intermediate position in the vertical direction of the lid second surface portion 68 and the upper portion of the receiving frame second surface portion 66 come into contact with each other, and due to the pressing force due to the elastic deformation of the outer peripheral portion 11 of the lid body 10, the lid second surface portion 68 and the receiving frame. The second surface portion 66 is pressed against each other.

The pressing force in this case is a restoring force generated when the outer peripheral portion 11 of the lid main body 10 is elastically deformed by the deflection amount δ from the natural state of FIG. 8, and from the lid second surface portion 68 to the receiving frame second surface portion 66. On the other hand, the action part P acts in the diameter increasing direction of the lid body 10.
As described above, in the present embodiment, as in the case of the first embodiment, when the lid body 10 is in the closed state, the weight of the lid body 10, the vehicle, etc. on the lid body 10 in the flat receiving frame support portion 40. The load applied by running is supported, and it is possible to prevent an excessive biting force of the lid main body 10 from the receiving frame 30 from being generated. Furthermore, the radial movement of the lid main body 10 is suppressed by the pressing force due to the elastic deformation of the outer peripheral portion 11 of the lid main body 10, and between the lid second surface portion 68 and the receiving frame second surface portion 66 in the closed state. A frictional force is generated, and the movement of the lid body 10 in the vertical direction is suppressed. Therefore, it is possible to prevent an excessive biting force from being generated on the receiving frame 30 of the lid body 10. Furthermore, rattling, vibration, noise, and sliding of the lid main body 10 can be suppressed by the pressing force and frictional force generated between the outer peripheral portion 11 of the lid main body 10 and the inner peripheral portion 31 of the receiving frame 30. .

  Here, in the present embodiment, in the closed state, an annular gap G2 is formed between the lid first surface portion 18 and the lid second surface portion 68 and the receiving frame first surface portion 42, and the lid second surface portion 68 and the receiving frame first The two surface portions 66 are in contact with each other. However, the present invention is not limited to this, and the elastic modulus of the outer peripheral portion 11 of the lid body 10 and the inner peripheral portion 31 of the receiving frame 30, the outer peripheral surface 12 of the outer peripheral portion 11 of the lid main body 10, and the inner peripheral surface of the inner peripheral portion 31 of the receiving frame 30. The contact state between the lid second surface portion 68 and the receiving frame second surface portion 66 can be controlled by setting the diameter dimension and the angle 34. For example, in the closed state, at least one of the lid first surface portion 18 and the lid second surface portion 68 may be at least in contact with at least one of the receiving frame first surface portion 42 and the receiving frame second surface portion 66. Further, due to the elastic deformation of the outer peripheral portion 11 of the lid main body 10 and the inner peripheral portion 31 of the receiving frame 30, the lid first surface portion 18 and the lid second surface portion 68, the receiving frame first surface portion 42 and the receiving frame second surface portion 66 are almost the entire surface. There may be a case where the annular gap G2 is not formed.

In the present embodiment, the receiving frame first surface portion 42 and the receiving frame second surface portion 66 are successively formed below the flat surface 38 of the receiving frame support portion 40 in order, and below the flat surface 19 of the lid flat receiving portion 16. The lid first surface portion 18 and the lid second surface portion 68 are successively formed. However, the present invention is not limited to this, and the receiving frame support portion 40 and the receiving frame first surface portion 42, and the receiving frame first surface portion 42 and the receiving frame second surface portion 66 may be formed discontinuously as in the case of the first embodiment. The lid flat receiving portion 16 and the lid first surface portion 18, and the lid first surface portion 18 and the lid second surface portion 68 may be formed discontinuously.
<Example 3>

FIG. 10 is a vertical cross-sectional view of the main part of the underground structure lid according to Embodiment 3 of the present invention. In addition, about the location which overlaps with Example 1 or Example 2, the same code | symbol is attached | subjected and description is abbreviate | omitted.
The inner peripheral surface 34 formed on the inner peripheral portion 31 of the receiving frame 30 of the present embodiment includes a flat receiving-shaped receiving frame support portion 40 continuous with the upper surface 36 of the receiving frame 30, and a receiving frame first surface portion 42 below the receiving frame support portion 40. And a receiving frame third surface portion 44 below the receiving frame first surface portion 42.

The receiving frame third surface portion 44 is formed below the receiving frame first surface portion 42 so as to increase in diameter toward the lower side of the receiving frame 30 with a gradient. Specifically, the receiving frame third surface portion 44 forms a gradient θ opposite to the receiving frame first surface portion 42 in the range of 0 ° to 9 °. In this embodiment, the receiving frame third surface portion 44 is formed with a gradient θ of 4 °.
On the other hand, the outer peripheral surface 12 formed on the outer peripheral portion 11 of the lid main body 10 includes a lid flat receiving portion 16 continuous with the upper surface 14 of the lid main body 10, a lid first surface portion 18 below the lid flat receiving portion 16, and a lid. It is composed of a lid third surface portion 26 below the first surface portion 18.

The lid third surface portion 26 is formed below the lid first surface portion 18 so as to increase in diameter toward the bottom of the lid body 10 with a gradient. Specifically, the lid third surface portion 26 forms a gradient ε opposite to the lid first surface portion 18 in a range of 0 ° to 10 °. In the present embodiment, the lid third surface portion 26 has a slope ε of 5 °.
As shown in FIG. 11, when the lid main body 10 is placed in the receiving frame 30, the lower part of the lid third surface portion 26 and the receiving frame first surface portion 42 start to contact each other. When the lid body 10 is further housed in the receiving frame 30, at least one of the outer peripheral portion 11 of the lid main body 10 and the inner peripheral portion 31 of the receiving frame 30 is elastically deformed. In the case of the present embodiment, as shown in FIG. 11, the outer peripheral portion 11 of the lid body 10 is greatly elastically deformed so as to be reduced in diameter from the natural state indicated by the broken line in the radial direction indicated by the solid line.

  In the closed state shown in FIG. 12, from the state of FIG. 11, the lid third surface portion 26 gets over the boundary 46 between the receiving frame first surface portion 42 and the receiving frame third surface portion 44, and the lid first surface portion 18 and the lid first surface portion. The boundary portion 28 with the three-surface portion 26 is substantially coincident with the boundary portion 46, and the lid main body 10 is in the proper closed position of the receiving frame 30.

  In this state, the lid flat receiving portion 16 is supported by the receiving frame supporting portion 40, so that the weight applied by the weight of the lid main body 10 and the vehicle traveling on the lid main body 10 is supported by the receiving frame supporting portion 40. The Furthermore, the lid third surface portion 26 and the receiving frame third surface portion 44 are in contact with each other over the entire circumference, and the lid third surface portion 26 and the receiving frame third surface portion are pressed by the pressing force due to the elastic deformation of the outer peripheral portion 11 of the lid body 10. 44 are pressed against each other. Furthermore, the outer peripheral portion 11 of the lid main body 10 is restrained from the inner peripheral portion 31 of the receiving frame 30 in a state of being prevented from coming off by pressing the expanded third lid surface portion 26 and the receiving frame third surface portion 44 together.

The pressing force in this case is a restoring force generated when the outer peripheral portion 11 of the lid main body 10 is elastically deformed by the deflection amount δ from the natural state of FIG. 10, and from the lid third surface portion 26 to the receiving frame third surface portion 44. In contrast, the lid body 10 acts in the diameter increasing direction.
As described above, in the present embodiment, in the same manner as in the first and second embodiments, when the lid main body 10 is in the closed state, the weight of the lid main body 10 and the vehicle etc. The load applied by traveling on the main body 10 is supported, and it is possible to prevent the excessive biting force of the lid main body 10 from being received into the receiving frame 30. Further, the lid third surface portion 26 and the receiving frame third surface portion 44 are pressed against each other by the pressing force generated by the elastic deformation of the outer peripheral portion 11 of the lid body 10, thereby suppressing the radial movement of the lid body 10.

  Further, in the closed state, the pressing force due to the elastic deformation of the outer peripheral portion 11 of the lid main body 10 acts, so that when the lid main body 10 tries to move in the vertical direction, the lid third surface portion 26 and the receiving frame first A frictional force is generated between the three surface portions 44 and the movement of the lid body 10 in the vertical direction is suppressed. Therefore, it is possible to prevent the excessive biting force of the lid main body 10 from being received into the receiving frame 30 by the flat receiving-shaped receiving frame support portion 40 and the lid flat receiving portion 16. Furthermore, rattling, vibration, noise, and sliding of the lid main body 10 can be suppressed by the pressing force and frictional force generated between the outer peripheral portion 11 of the lid main body 10 and the inner peripheral portion 31 of the receiving frame 30. .

  Particularly in the case of the present embodiment, the lid third surface portion 26 and the receiving frame third surface portion 44 are pressed against each other by the pressing force due to the elastic deformation of the outer peripheral portion 11 of the lid body 10. Furthermore, the outer peripheral portion 11 of the lid main body 10 is restrained from the inner peripheral portion 31 of the receiving frame 30 in a state of being prevented from coming off by pressing the expanded third lid surface portion 26 and the receiving frame third surface portion 44 together. For this reason, it is preferable that the vertical movement of the lid body 10 can be more effectively suppressed by the restraint by the pressing force, the frictional force, and the retaining prevention as compared with the case of the first and second embodiments.

In the present embodiment, as in the case of the first and second embodiments, the inherent elastic coefficient of the outer peripheral portion 11 of the lid main body 10, the section coefficient of the outer peripheral portion 11 of the lid main body 10, and the inner periphery of the receiving frame 30. The outer peripheral part 11 of the lid body 10 is largely elastically deformed by setting the inherent elastic coefficient of the part 31 and the section modulus of the inner peripheral part 31 of the receiving frame 30. However, the present invention is not limited to this, and setting the inner peripheral portion 31 of the receiving frame 30 to be elastically deformed greatly also causes both the outer peripheral portion 11 of the lid body 10 and the inner peripheral portion 31 of the receiving frame 30 to be elastically deformed appropriately. Can also be set.
<Example 4>

FIG. 13: is a longitudinal cross-sectional view of the principal part of the lid | cover for underground structures which concerns on Example 4 of this invention. In addition, about the location which overlaps with Example 1 thru | or Example 3, the same code | symbol is attached | subjected and description is abbreviate | omitted.
As in the case of the third embodiment, the inner peripheral surface 34 formed on the inner peripheral portion 31 of the receiving frame 30 of the present embodiment is a flat receiving-shaped receiving frame support portion 40 that is continuous with the upper surface 36 of the receiving frame 30, and a receiving frame support portion. A receiving frame first surface portion 42 below 40, and a receiving frame third surface portion 44 below the receiving frame first surface portion 42.

On the other hand, the outer peripheral surface 12 formed on the outer peripheral portion 11 of the lid main body 10 includes a lid flat receiving portion 16 continuous with the upper surface 14 of the lid main body 10, a lid first surface portion 18 below the lid flat receiving portion 16, and a lid. The lid third surface portion 26 below the first surface portion 18 and the lid fourth surface portion 50 below the lid third surface portion 26 are configured.
The lid fourth surface portion 50 is formed with a diameter that is reduced toward the bottom of the lid body 10 with a gradient below the lid third surface portion 26. In the present embodiment, the lid fourth surface portion 50 is formed with a gradient having an angle equal to that of the receiving frame first surface portion 42.

  As shown in FIG. 14, when the lid main body 10 is stored in the receiving frame 30, the lid fourth surface portion 50 and the receiving frame first surface portion 42 start to come into contact with each other, and when the lid main body 10 is further stored in the receiving frame 30, At least one of the outer peripheral portion 11 and the inner peripheral portion 31 of the receiving frame 30 is elastically deformed. In the case of the present embodiment, as shown in FIG. 14, the outer peripheral portion 11 of the lid body 10 is greatly elastically deformed so as to be reduced in diameter from the natural state indicated by the broken line in the radial direction indicated by the solid line.

  In the closed state shown in FIG. 15, from the state of FIG. 14, the lid third surface portion 26 and the lid fourth surface portion 50 get over the boundary portion 46 between the receiving frame first surface portion 42 and the receiving frame third surface portion 44 and The boundary portion 28 between the first surface portion 18 and the lid third surface portion 26 is substantially in alignment with the boundary portion 46, and the lid main body 10 is in the normal lid position of the receiving frame 30.

  In this state, as in the case of the third embodiment, the lid flat receiving portion 16 is supported by the receiving frame support portion 40, so that the weight of the lid main body 10, the vehicle, and the like are added by traveling on the lid main body 10. The load is supported by the receiving frame support portion 40. Furthermore, the lid third surface portion 26 and the receiving frame third surface portion 44 are in contact with each other over the entire circumference, and the lid third surface portion 26 and the receiving frame third surface portion are pressed by the pressing force due to the elastic deformation of the outer peripheral portion 11 of the lid body 10. 44 are pressed against each other. Furthermore, the outer peripheral portion 11 of the lid main body 10 is restrained from the inner peripheral portion 31 of the receiving frame 30 in a state of being prevented from coming off by pressing the expanded third lid surface portion 26 and the receiving frame third surface portion 44 together.

The pressing force in this case is a restoring force generated as the outer peripheral portion 11 of the lid main body 10 is elastically deformed by the deflection amount δ from the natural state of FIG. The cover body 10 acts in the diameter increasing direction from the three surface portions 26 to the receiving frame third surface portion 44.
As described above, in the case of the present embodiment, the lid fourth surface portion 50 is formed with a gradient having an angle equal to that of the receiving frame first surface portion 42. Compared to the case shown in FIG. 5, the receiving frame first surface portion 42 can function as a guide surface of the lid fourth surface portion 50, so that the lid body 10 can be smoothly closed, and the operator can close the lid. The burden can be greatly reduced.
<Example 5>

FIG. 16: is a longitudinal cross-sectional view of the principal part of the lid | cover for underground structures which concerns on Example 5 of this invention. In addition, about the location which overlaps with Example 1 thru | or Example 4, the same code | symbol is attached | subjected and description is abbreviate | omitted.
As in the case of the first embodiment, the inner peripheral surface 34 formed on the inner peripheral portion 31 of the receiving frame 30 of the present embodiment is a flat receiving-shaped receiving frame support portion 40 that is continuous with the upper surface 36 of the receiving frame 30, and a receiving frame support portion. 40 and a receiving frame first surface portion 42 below 40.

On the other hand, the outer peripheral surface 12 formed on the outer peripheral portion 11 of the lid main body 10 includes a lid flat receiving portion 16 continuous with the upper surface 14 of the lid main body 10 and a lid first surface portion 18 below the lid flat receiving portion 16. ing.
The lid first surface portion 18 is formed by a plurality of projecting portions 64 projecting at intervals in the circumferential direction below the lid flat receiving portion 16. Further, as shown in FIGS. 16 and 17, a recess 62 is provided at the base end of the protrusion 64 so as to surround the protrusion 64.

  In the closed state shown in FIG. 18, as in the case of the first embodiment, the lid flat receiving portion 16 is supported by the receiving frame support portion 40, so that the weight of the lid main body 10, the vehicle, etc. A load applied by traveling is supported by the receiving frame support 40. Furthermore, the lower part of the lid first surface part 18 and the lower part of the receiving frame first surface part 42 come into contact with each other, and the lid first surface part 18 moves the receiving frame first surface part 42 by the pressing force due to the elastic deformation of the outer peripheral part 11 of the lid body 10. Press.

As described above, in this embodiment, the base end of the protrusion 64 is provided with the recess 62 so as to surround the protrusion 64. For this reason, it becomes possible to ensure the height of the protrusion 64 high while keeping the height of the lid body (the height from the upper surface 14 of the lid body 10 to the lower end of the protrusion 64) at a predetermined height. It is preferable because the elastic deformation of the portion 64 can be promoted.
In the present embodiment, the lid first surface portion 18 is formed by the protruding portion 64, but the present invention is not limited to this, and the receiving frame first surface portion 42 may be formed by the protruding portion.

The present invention is not limited to the above embodiments, and various modifications are possible.
For example, the shapes of the lid body 10 and the receiving frame 30 are not limited to the above-described embodiments, and can be used for a square underground structure as long as the pressing force and the frictional force accompanying the elastic deformation of each part described above can be generated. Of course, various other modifications such as a lid can be considered.

DESCRIPTION OF SYMBOLS 10 Lid body 16 Lid flat receiving part 18 Lid 1st surface part 20 Back surface 22 Reinforcement rib 24 End part 26 Lid 3rd surface part 30 Receiving frame 40 Receiving frame support part 42 Receiving frame 1st surface part 44 Receiving frame 3rd surface part 48 Slit (notch part)
50 Lid 4th surface part 66 Receiving frame 2nd surface part 68 Lid 2nd surface part

Claims (12)

A lid for an underground structure comprising a lid body and a receiving frame that supports the lid body so as to be openable and closable at an inner periphery thereof,
The inner periphery of the receiving frame is
A flat receiving frame support,
A receiving frame first surface portion formed by reducing the diameter toward the lower side of the receiving frame with a gradient below the receiving frame supporting portion;
The outer periphery of the lid body is
A lid flat receiving portion supported by the receiving frame supporting portion;
Below the lid flat receiving part, the diameter of the lid is formed by reducing the diameter vertically toward the lower side of the lid main body or with a steeper slope than the first surface part of the receiving frame toward the lower side of the lid main body. One surface part,
In the closed state of the lid body, the lid flat receiving portion is supported by the receiving frame support portion, and the lid first surface portion and the receiving frame first surface portion are an outer peripheral portion of the lid main body and an inner periphery of the receiving frame. Are pressed against each other by a pressing force due to elastic deformation of at least one of the parts ,
The outer peripheral part of the lid body and / or the inner peripheral part of the receiving frame is provided with a plurality of notches and / or a plurality of through holes in the circumferential direction,
The plurality of cutout portions and / or the plurality of through-hole portions are an outer peripheral portion of the lid main body located below the lid first surface portion and / or an inner circumference of the receiving frame located below the receiving frame first surface portion. A lid for an underground structure characterized by being provided in the section .   A lid for an underground structure comprising a lid body and a receiving frame that supports the lid body so as to be openable and closable at an inner periphery thereof,
  The inner periphery of the receiving frame is
  A flat receiving frame support,
  A receiving frame first surface portion formed by reducing the diameter toward the lower side of the receiving frame with a gradient below the receiving frame supporting portion;
  The outer periphery of the lid body is
  A lid flat receiving portion supported by the receiving frame supporting portion;
  Below the lid flat receiving part, the diameter of the lid is formed by reducing the diameter vertically toward the lower side of the lid main body or with a steeper slope than the first surface part of the receiving frame toward the lower side of the lid main body. One surface part,
  In the closed state of the lid body, the lid flat receiving portion is supported by the receiving frame support portion, and the lid first surface portion and the receiving frame first surface portion are an outer peripheral portion of the lid main body and an inner periphery of the receiving frame. Are pressed against each other by a pressing force due to elastic deformation of at least one of the parts,
  The outer peripheral part of the lid main body located below from the first surface part of the lid and / or the inner peripheral part of the receiving frame located below from the first surface part of the receiving frame are protruded by a plurality of protrusions spaced in the circumferential direction. An underground structure lid formed by A lid for an underground structure comprising a lid body and a receiving frame that supports the lid body so as to be openable and closable at an inner periphery thereof,
The inner periphery of the receiving frame is
A flat receiving frame support,
A receiving frame first surface portion formed by reducing the diameter toward the lower side of the receiving frame with a gradient below the receiving frame supporting portion;
A receiving frame second surface portion formed by reducing the diameter toward the lower side of the receiving frame with a different gradient from the receiving frame first surface portion below the receiving frame first surface portion;
The outer periphery of the lid body is
A lid flat receiving portion supported by the receiving frame supporting portion;
Below the lid flat receiving part, the diameter of the lid is formed by reducing the diameter vertically toward the lower side of the lid main body or with a steeper slope than the first surface part of the receiving frame toward the lower side of the lid main body. One side,
A lid second surface portion formed by reducing the diameter toward the lower portion of the lid body with a gradient different from that of the lid first surface portion below the lid first surface portion;
In the closed state of the lid body, the lid flat receiving portion is supported by the receiving frame supporting portion, and at least one of the lid first surface portion and the lid second surface portion, the receiving frame first surface portion, and the A lid for an underground structure, wherein at least one of the receiving frame second surface portions is pressed against each other by a pressing force generated by elastic deformation of at least one of the outer peripheral portion of the lid main body and the inner peripheral portion of the receiving frame. . A lid for an underground structure comprising a lid body and a receiving frame that supports the lid body so as to be openable and closable at an inner periphery thereof,
The inner periphery of the receiving frame is
A flat receiving frame support,
A receiving frame first surface portion formed below the receiving frame support portion;
A receiving frame third surface portion formed below the receiving frame first surface portion, vertically extending toward the lower portion of the receiving frame or with a gradient toward the lower portion of the receiving frame;
The outer periphery of the lid body is
A lid flat receiving portion supported by the receiving frame supporting portion;
A lid first surface portion formed below the lid flat receiving portion;
Below the lid first surface portion, the lid third surface portion is formed by expanding the diameter vertically toward the lower portion of the lid body or with a gradient toward the lower portion of the lid body,
In the closed state of the lid body, the lid flat receiving portion is supported by the receiving frame supporting portion, and the lid third surface portion and the receiving frame third surface portion are an outer peripheral portion of the lid main body and an inner periphery of the receiving frame. Are pressed against each other by a pressing force due to elastic deformation of at least one of the parts ,
The outer peripheral part of the lid body and / or the inner peripheral part of the receiving frame is provided with a plurality of notches and / or a plurality of through holes in the circumferential direction,
The plurality of cutout portions and / or the plurality of through-hole portions are an outer peripheral portion of the lid main body located below the lid first surface portion and / or an inner circumference of the receiving frame located below the receiving frame first surface portion. A lid for an underground structure characterized by being provided in the section .   A lid for an underground structure comprising a lid body and a receiving frame that supports the lid body so as to be openable and closable at an inner periphery thereof,
  The inner periphery of the receiving frame is
  A flat receiving frame support,
  A receiving frame first surface portion formed below the receiving frame support portion;
  A receiving frame third surface portion formed below the receiving frame first surface portion, vertically extending toward the lower portion of the receiving frame or with a gradient toward the lower portion of the receiving frame;
  The outer periphery of the lid body is
  A lid flat receiving portion supported by the receiving frame supporting portion;
  A lid first surface portion formed below the lid flat receiving portion;
  Below the lid first surface portion, the lid third surface portion is formed by expanding the diameter vertically toward the lower portion of the lid body or with a gradient toward the lower portion of the lid body,
  In the closed state of the lid body, the lid flat receiving portion is supported by the receiving frame supporting portion, and the lid third surface portion and the receiving frame third surface portion are an outer peripheral portion of the lid main body and an inner periphery of the receiving frame. Are pressed against each other by a pressing force due to elastic deformation of at least one of the parts,
  The outer peripheral part of the lid main body located below from the first surface part of the lid and / or the inner peripheral part of the receiving frame located below from the first surface part of the receiving frame are protruded by a plurality of protrusions spaced in the circumferential direction. An underground structure lid formed by The outer peripheral portion of the lid body has a lid fourth surface portion formed by reducing the diameter toward the lower side of the lid body with a gradient at an angle equal to that of the receiving frame first surface portion below the lid third surface portion. The lid for underground structures according to claim 4 or 5 , characterized by the above. When the lid main body is first placed in the receiving frame to be in the closed state, the outer peripheral surface or the lower surface of the outer peripheral portion of the lid main body and the inner peripheral surface of the inner peripheral portion of the receiving frame abut, The underground structure according to any one of claims 1 to 6 , wherein the outer peripheral portion of the main body and / or the inner peripheral portion of the receiving frame undergoes plastic deformation in a state in which a pressing force due to elastic deformation remains. Lid. The inner peripheral portion of the outer peripheral portion and / or the receiving frame of the lid body can be of any claims 1 to 7, characterized in that a plurality of notch and / or a plurality of through-holes in the circumferential direction The lid for underground structures according to claim 1. The plurality of cutout portions and / or the plurality of through-hole portions are an outer peripheral portion of the lid main body located below the lid first surface portion and / or an inner circumference of the receiving frame located below the receiving frame first surface portion. The lid for an underground structure according to claim 8 , wherein the lid is provided in the section. The outer peripheral part of the lid main body located below from the first surface part of the lid and / or the inner peripheral part of the receiving frame located below from the first surface part of the receiving frame are protruded by a plurality of protrusions spaced in the circumferential direction. The lid for an underground structure according to any one of claims 1 to 7 , wherein the lid is for an underground structure. 11. The lid for an underground structure according to claim 10 , wherein a concave portion is provided at a proximal end of the protruding portion so as to surround the protruding portion. Reinforcing ribs on the back of the lid body,
The ends of the reinforcing ribs, underground structures lid according to any one of claims 1 to 11, characterized in that apart from the inner peripheral wall of the outer peripheral portion of the lid body.

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