JP2016044517A - Cover receiving frame set for underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover receiving frame set for an underground structure devised for restraining slipping-up of a cover body, without requiring high dimensional accuracy.SOLUTION: A receiving frame 3 comprises an abutting object part 312 under a frame side taper surface 311, by providing the frame side taper surface 311 inclined to the outside by turning upward, in an inner peripheral surface part 31, in which a manhole cover 2 is inclined to the outside for turning upward, and comprises an abutting part 222 under a cover side taper surface 221 by providing the cover side taper surface 221 fitted to the frame side taper surface 311 in an outer peripheral surface part 22, and the abutting part 222 is opposed to the abutting object part 312 by opening a clearance C1 in the horizontal direction of the manhole cover 2 in a state where the manhole cover 2 supported by the receiving frame 3 is horizontal to an upper end surface of the receiving frame 3, on the one hand, regulates the manhole cover 2 in inclining more than a constant angle by abutting on the abutting object part 312 when the manhole cover 2 inclines up to the constant angle to the receiving frame 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an underground structure lid receiving frame set including a receiving frame that defines an opening connected to an underground structure and a lid that is supported by the receiving frame and closes the opening.

  In places where underground structures such as underground and underground facilities such as sewers and waterworks, electric power, gas, and communications are connected to the ground, a receiving frame that defines an opening that connects to the underground structure, and the receiving frame must support In some cases, a lid receiving frame set for an underground structure including a lid that closes the opening is installed. The receiving frame set for an underground structure is provided with a frame-side taper surface that is inclined outward as it goes upward on the inner peripheral side of the receiving frame, and the lid side that is inclined outward as it goes upward on the outer peripheral side of the lid A taper surface is known. Hereinafter, an angle inclined with respect to a direction perpendicular to the upper surface of the lid that is horizontal to the upper end surface of the receiving frame may be referred to as an inclination angle. The frame-side taper surface and the lid-side taper surface are in contact with each other with the angle of inclination set to be substantially the same, and this is what is called a taper fitting, and when a load is applied to the lid body, due to the wedge effect, Shaking of the lid can be suppressed. However, when a load is locally applied to the peripheral portion of the lid, the lid is lowered at the portion where the load is applied, while the portion opposite to the portion where the load is applied is raised. As a result, a so-called sliding-up that fits in a state where the lid body is inclined with respect to the receiving frame may occur. Here, if both the inclination angle of the frame-side taper surface and the inclination angle of the lid-side taper surface are reduced (if both the frame-side taper surface and the lid-side taper surface are steeply inclined), the wedge effect increases and the lid body Slip-up can be suppressed. However, the smaller the inclination angle between the frame-side tapered surface and the lid-side tapered surface, the easier the lid body bites into the receiving frame. As a result, when a load is applied to the lid, the force that the lid bites into the receiving frame becomes too strong, and there arises a problem that it becomes difficult to open the lid. For this reason, a receiving frame set for an underground structure has been proposed that attempts to suppress the rising of the lid without increasing the force with which the lid bites into the receiving frame (see, for example, Patent Document 1 and Patent Document 2). ).

  The underground structure lid receiving frame set described in Patent Document 1 is provided with a plurality of fitting portions that are in contact with a part of the outer peripheral surface of the lid body and a part of the inner peripheral surface of the receiving frame at intervals in the vertical direction. It is a thing. That is, an upper fitting portion and a lower fitting portion positioned below the upper fitting portion are provided. In the lid receiving frame set for underground structures described in Patent Document 1, a part of the outer peripheral surface of the lid body is part of the inner peripheral surface of the receiving frame in both the upper fitting portion and the lower fitting portion. It is trying to suppress the sliding of the lid body by contacting.

  Moreover, the cover receiving frame set for underground structures described in Patent Document 2 forms a frame-side upper tapered surface at the upper portion of the inner peripheral surface of the receiving frame, and the frame-side lower tapered surface at the lower portion of the inner peripheral surface of the receiving frame. Is forming. In addition, an upper corner portion that is in line contact with the frame-side upper taper surface in the circumferential direction is provided at the upper portion of the outer peripheral surface of the lid, and line contact is made in the circumferential direction with the frame-side lower taper surface at the lower portion of the outer periphery of the lid A lower corner is provided. In the lid receiving frame set for an underground structure described in Patent Document 2, when a load is applied to the lid, the inner peripheral side surface of the receiving frame is plastically deformed by the upper corner and the lower corner, thereby causing the lid to slide. I'm trying to suppress the rise.

Japanese Patent No. 5161148 JP2013-7198A

  However, the underground structure lid receiving frame set described in Patent Document 1 is a part of the inner peripheral surface of the receiving frame and the outer peripheral surface of the outer frame in both the upper fitting portion and the lower fitting portion. It is necessary to contact the portion, and high accuracy is required for the dimensions of the inner peripheral surface of the receiving frame and the outer peripheral surface of the outer frame. Moreover, also in the lid receiving frame set for underground structures described in Patent Document 2, when the upper and lower corners of the lid appropriately contact the inner peripheral surface of the receiving frame and the lid is loaded In addition, in order to plastically deform the inner peripheral side surface of the receiving frame by the upper corner portion and the lower corner portion, a point that high dimensional accuracy is required is the same. For this reason, neither the underground structure lid receiving frame set described in Patent Document 1 nor the underground structure lid receiving frame set described in Patent Document 2 is difficult to manufacture.

  In view of the above circumstances, an object of the present invention is to provide a lid receiving frame set for an underground structure that is devised to prevent the lid from sliding up without requiring high dimensional accuracy.

A lid receiving frame set for an underground structure according to the present invention that solves the above-mentioned object is an underground structure including a receiving frame that defines an opening connected to the underground structure, and a lid that is supported by the receiving frame and closes the opening. In the lid receiving frame set,
The receiving frame is provided with a frame-side tapered surface inclined outward as it goes upward, and has a contacted portion below the frame-side tapered surface,
The lid body is inclined outward as it goes upward, a lid-side taper surface that fits the frame-side taper surface is provided on the outer peripheral side, and has a contact portion below the lid-side taper surface. Yes,
In the state where the lid supported by the receiving frame is horizontal with respect to the upper end surface of the receiving frame, the abutting portion is opposed to the contacted portion with a gap in the horizontal direction. When the lid body tilts to a certain angle with respect to the upper end surface, the lid body abuts against the contacted portion and restricts the lid body from tilting more than the certain angle.

  Here, the lid may be round (circular in plan view) or square (rectangular in plan view). Moreover, the said horizontal direction means an outer-inner direction, for example, when the said cover body is a round shape, the said horizontal direction is equivalent to a radial direction. The frame-side tapered surface may be provided on the entire inner periphery of the lid body, or may be provided on a part of the inner periphery. For example, the frame-side taper surface may be provided at predetermined intervals in the circumferential direction of the inner periphery. Furthermore, the inclination angle of the frame side taper surface and the inclination angle of the lid side taper surface may be the same. In this case, the frame-side tapered surface and the lid-side tapered surface are so-called tapered fitting. The abutted portion may have a tapered surface having a smaller inclination angle than the frame-side tapered surface. Further, the frame-side tapered surface and the contacted portion may be continuous, or another portion may be interposed between the frame-side tapered surface and the contacted portion. Further, the contact portion has a peripheral surface that faces the contacted portion substantially in parallel with the lid supported by the receiving frame in a state where it is horizontal with respect to the upper end surface of the receiving frame. The peripheral surface may be a tapered surface having an inclination angle smaller than that of the lid-side tapered surface. The peripheral surface may be continuous with the lid-side tapered surface, or another portion may be interposed between the peripheral surface and the lid-side tapered surface. The other portion is a portion that does not come into contact with the contacted portion even when the lid body is tilted from a state of being supported horizontally with respect to the upper end surface of the receiving frame. Furthermore, in the state where the lid is supported horizontally with respect to the upper end surface of the receiving frame, the contact portion may have a protrusion or a ridge protruding toward the contacted portion. The contacted part may have a protrusion or a ridge protruding toward the contact part.

  According to the underground structure lid receiving frame set of the present invention, when the lid body is inclined to the predetermined angle with respect to the upper end surface of the receiving frame, the contact portion comes into contact with the contacted portion, and the lid body is Inclination beyond the certain angle is restricted. Thereby, the sliding-up of the said cover body can be suppressed. Further, in a state where the lid is supported horizontally with respect to the upper end surface of the receiving frame, the abutting portion and the abutted portion are not in contact with each other, and a gap is left in the horizontal direction of the lid. . Further, when the lid body is tilted, it is sufficient that the abutting portion comes into contact with the abutted portion as long as the lid body does not slide up. It only needs to be within a certain range. For these reasons, high accuracy is not required for the dimensions of the abutting portion and the abutted portion, and manufacturing is facilitated. In addition, the force which the said cover body bites into the said receiving frame can also be adjusted by adjusting the inclination-angle of the said frame side taper surface and the said lid side taper surface. Further, the frame-side taper surface and the lid-side taper surface may cause a relationship that forms an upper fitting portion and a lower fitting portion as shown in Patent Document 1, or may occur accidentally. Although it is good, the lid receiving frame set for underground structures according to the present invention can be easily manufactured because it can suppress the sliding of the lid without depending on this relationship.

Moreover, in the lid receiving frame set for an underground structure according to the present invention, the receiving frame has a stop portion protruding inwardly below the contacted portion,
The stop portion may be spaced downward with respect to the contact portion of the lid body in a state where the height position of the upper surface of the lid body coincides with the height position of the upper end surface of the receiving frame. Good.

  By so doing, when the height of the upper surface of the cover body coincides with the height position of the upper end surface of the receiving frame, the entire lid body is lowered, and when the so-called sliding occurs, the contact portion Can be stopped by contacting the stop portion.

Moreover, in the lid receiving frame set for an underground structure of the present invention, the contact portion is provided closer to the center side of the lid body than the lid-side tapered surface,
The lid body has a lower surface portion between the lid-side tapered surface and the contact portion,
The abutted portion is provided inside the receiving frame from the frame-side tapered surface,
The receiving frame has a stop surface portion between the frame-side tapered surface and the contacted portion,
The stop surface portion may be spaced downward with respect to the lower surface portion of the lid body in a state where the height position of the upper surface of the lid body coincides with the height position of the upper end surface of the receiving frame. .

  The contact portion is provided closer to the center side of the lid body than the lid-side tapered surface, and the contacted portion is provided more inside the receiving frame than the frame-side tapered surface. The corresponding contact portion provided on the center side of the lid body abuts on the contacted portion provided on the inner side of the receiving frame, whereby the lid body can be further prevented from rising. Moreover, the lower surface part can contact | abut to the said stop surface part, and can stop the sliding of the said cover body.

  ADVANTAGE OF THE INVENTION According to this invention, the high dimensional accuracy is not requested | required, and the cover receiving frame set for underground structures by which the device which suppresses the rising of a cover body was made | formed can be provided.

(A) is sectional drawing of the lid receiving frame set for underground structures which is one Embodiment of this invention, (b) is a top view of the lid receiving frame set for underground structures shown to (a). (A) is an enlarged view showing an A portion of FIG. 1 (a), and (b) is a view showing a state where the manhole cover 2 shown in (a) is tilted to a certain angle. It is a figure for demonstrating a mode that a manhole cover slides down from the initial stage support state shown in FIG. It is a figure which shows the part corresponding to Fig.2 (a) in the 1st modification of the lid receiving frame set shown in FIGS. It is a figure which shows the part corresponding to Fig.2 (a) in the 2nd modification of the lid receiving frame set shown in FIGS. It is a figure which shows the aspect corresponding to FIG. 2 in the lid receiving frame set of 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  Fig.1 (a) is sectional drawing of one Embodiment of the underground structure lid receiving frame set 10, FIG.1 (b) is a top view of the underground structure lid receiving frame set 10 shown to Fig.1 (a). It is. Hereinafter, the lid receiving frame set 10 for underground structures is abbreviated as the lid receiving frame set 10. The cross-sectional view shown in FIG. 1A is a cross-sectional view taken along the line AA in FIG. 1A shows the ground G, and in FIG. 1B, the ground G is omitted.

  FIG. 1 shows a lid receiving frame set 10 including a manhole cover 2 corresponding to an embodiment of a lid and an annular receiving frame 3 that supports the manhole cover 2. A sewer drain pipe, which is an underground buried object, is buried at a predetermined depth from the ground surface, and a manhole is provided as an underground facility in the middle of the sewer drain pipe. Both sewer drains and manholes are equivalent to underground structures. The manhole is formed as a vertical hole from the sewer drain pipe to the surface of the earth by using a box made of ready-made concrete moldings. The receiving frame 3 is provided on the housing and defines an opening H that leads to a manhole that is an underground structure.

  The manhole cover 2 has a circular shape in a plan view so as to freely open and close the opening H connected to the manhole which is an underground structure, and the manhole cover 2 shown in FIG. The manhole cover 2 shown in FIG. 1 is made of cast iron formed by casting. In addition, the manhole cover 2 may be made of iron other than cast iron, or may be made of metal other than iron. The manhole cover 2 includes a disk-shaped disk part 21, an outer peripheral surface part 22 provided on the outer peripheral part of the disk part 21, and a rib 23 that protrudes downward from the disk part 21 and is arranged in a grid pattern. The rib 23 is formed integrally with the disk portion 21 and the outer peripheral surface portion 22 when the manhole cover 2 is cast for the purpose of increasing the strength of the manhole cover 2. The outer peripheral surface portion 22 will be described in detail later.

  The receiving frame 3 is made of cast iron formed by casting, and has a cylindrical shape formed in an annular shape in a plan view having an inner peripheral surface portion 31 and an upper end surface 32. The inner peripheral surface portion 31 will be described in detail later.

  In FIG. 1A, the upper side of the figure is the ground side, and the lower side of the figure is the underground side. In the present embodiment, an example in which the receiving frame 3 is installed on the horizontal ground G is described as an example. The upper end surface 32 of the receiving frame 3 is endless, and the upper end surface 32 of the receiving frame 3 is continuous with the ground G without a step. That is, the upper end surface 32 of the receiving frame 3 is aligned with the same height position as the ground G when the receiving frame 3 is installed on the ground G. Further, FIG. 1A shows an initial state in which the lid receiving frame set 1 is installed, and the manhole cover 2 supported by the receiving frame 3 is horizontal to the receiving frame 3 and on the receiving frame 3. The state where the height position of the upper surface 21a of the disk part 21 corresponding to the upper surface of the manhole cover 2 is matched with the height position of the end surface 32 is shown. Hereinafter, the state of the manhole cover 2 supported by the receiving frame 3 shown in FIG. 1A may be referred to as an initial support state. In this embodiment, since the receiving frame 3 is installed horizontally as described above, the upper surface 21a of the disk portion 21 is also horizontal. In FIG. 1, a hinge member that rotatably connects the manhole cover 2 to the receiving frame 3, a lock member that maintains the state where the manhole cover 2 closes the opening H, and the like are omitted.

  Fig.2 (a) is an enlarged view which expands and shows the A section of Fig.1 (a).

  As shown in FIG. 2A, the inner peripheral surface portion 31 of the receiving frame 3 is provided with a frame-side tapered surface 311, a contacted portion 312 and a stop portion 313 from the ground G side to the underground side in the order of description. . The frame-side tapered surface 311 is a tapered inner peripheral surface that is inclined outward and connected to the upper end surface 32 as it goes upward, and the inclination angle θ1 is set to about 5 degrees to 12 degrees. 2 and 3 showing the present embodiment, and FIGS. 4 to 6 showing the modified example and the second embodiment, the inclination is larger than the actual inclination angle so that the inclined state is easily understood. The situation is exaggerated. The contacted portion 312 is a cylindrical inner peripheral surface that is connected to the lower end portion of the frame-side tapered surface 311 and extends in a direction perpendicular to a line connecting the upper end surfaces 32 of the receiving frame 3, and has an inclination angle of 0 degree. Is set to In the present embodiment, since the receiving frame 3 is installed so that the line connecting the upper end surfaces 32 of the receiving frame 3 is horizontal, the contacted portion 312 extends in the vertical direction. Note that, as in Modification 1 described later, the abutted portion 312 can also be configured to be inclined outward as it goes upward. The inclination angle of the contact portion 312 is preferably smaller than the inclination angle of the frame-side tapered surface 311. The stop portion 313 is a portion protruding in a ring shape inside the receiving frame 3 from a position below the contacted portion 312. The stop portions 313 are not necessarily provided in a ring shape, and a plurality of the stop portions 313 may be protruded at a predetermined interval in the circumferential direction of the inner peripheral surface portion 31.

  The outer peripheral surface portion 22 of the manhole cover 2 is provided with a lid-side tapered surface 221, and a contact portion 222 is provided below the lid-side tapered surface 221. The lid-side tapered surface 221 is a tapered outer peripheral surface that is inclined outward as it goes upward and is connected to the upper surface 21a. The inclination angle is set to substantially the same θ1 as that of the frame-side tapered surface 311. Further, the lid-side taper surface 221 is a surface having an upward length longer than an upward length of the frame-side taper surface 311. The contact portion 222 has a cylindrical outer peripheral surface 2221 composed of a cylindrical outer peripheral surface and a corner portion 2222 provided at the lower end portion thereof. The cylindrical outer peripheral surface 2221 is an outer peripheral surface extending in a direction orthogonal to the upper surface 21a of the manhole cover 2, and the inclination angle is set to 0 degree.

  In the initial support state shown in FIG. 2A, the height position of the upper surface 21a of the manhole cover 2 matches the height position of the upper end surface 32 of the receiving frame 3 as described above. Further, the lid-side taper surface 221 is in surface contact with substantially the entire surface of the frame-side taper surface 311, and the frame-side taper surface 311 and the lid-side taper surface 221 are taper-fitted. As described above, the lid-side tapered surface 221 is longer in the upward direction than the frame-side tapered surface 311, and therefore, a portion that does not come into surface contact with the frame-side tapered surface 311 on the lower end side of the lid-side tapered surface 221. Has occurred. The contact part 222 faces the contacted part 312 with a horizontal gap C1. Further, the contact portion 222 is spaced apart from the stop portion 313 of the receiving frame 3 in the vertical direction with a gap C2 in the vertical direction. In the initial support state, the horizontal gap C1 is set smaller than the vertical gap C2.

  FIG. 2B shows a state where the manhole cover 2 shown in FIG.

  When a load is locally applied to the peripheral portion of the manhole cover 2, the portion of the manhole cover 2 on which the load is applied is lowered, while the portion opposite to the portion on which the load is applied is raised, and the manhole cover 2 is tilted. In FIG. 2B, a load is locally applied to the right peripheral portion of the manhole cover 2 (not shown), the left portion of the manhole cover 2 is raised, and the manhole cover 2 is inclined at a certain angle with respect to the receiving frame 3. It shows a state. As shown in FIG. 2 (b), when the manhole cover 2 is inclined at a certain angle with respect to the receiving frame 3, the corner portion 2222 of the contact portion 222 of the manhole cover 2 contacts the contacted portion 312 of the receiving frame 3. ing. As a result, the manhole cover 2 is restricted from tilting at a certain angle as shown in FIG. 2B, and the manhole cover 2 can be prevented from rising.

  Here, in the initial support state shown in FIG. 2A, the horizontal gap C <b> 1 and the contact portion 222 are not in contact with the contacted portion 312 between the contact portion 222 and the contacted portion 312. Strictness is not so required for the fixed angle of contact. For this reason, high dimensional accuracy is not required for the contact portion 222 and the contacted portion 312, and the lid receiving frame set 1 can be easily manufactured.

  FIG. 3 is a view for explaining how the manhole cover 2 slides down from the initial support state shown in FIG.

  When the state where a load is applied to the manhole cover 2 is repeated, as shown in FIG. 3A, the manhole cover 2 slides down from the initial support state shown in FIG. The height position of the upper surface 21 a of the manhole cover 2 is lower than the height position of the upper end surface 32. In the state shown in FIG. 3A, for example, even when the vertical gap C2 is smaller than the horizontal gap C1, a load is locally applied to the peripheral portion of the manhole cover 2, and the manhole cover 2 Is inclined, the corner portion 2222 of the contact portion 222 contacts the contacted portion 312 of the receiving frame 3. Thereby, the sliding-up of the manhole cover 2 can be suppressed.

  Furthermore, when the state where a load is applied to the manhole cover 2 is repeated, the manhole cover 2 further slides down, and the contact portion 222 eventually contacts the stop portion 313 as shown in FIG. . Thereby, the sliding down of the manhole cover 2 can be stopped. Even in the state where the contact portion 222 is in contact with the stop portion 313, if a load is applied locally to the peripheral portion of the manhole cover 2 and the manhole cover 2 is tilted, the corner portion 2222 of the contact portion 222 is Since it abuts against the abutted portion 312, rattling of the manhole cover 2 can be suppressed.

  Next, a modified example of the lid receiving frame set 10 described so far will be described. In the following description of the modified example and the subsequent description of the second embodiment, the differences from the lid receiving frame set 1 of the first embodiment shown in FIGS. A component having the same name as the name of the element is described with the reference numeral used so far, and redundant description may be omitted.

  FIG. 4 is a view showing a portion corresponding to FIG. 2A in the first modified example of the lid receiving frame set 10 shown in FIGS. In the lid receiving frame set 10 of the first modified example, the configurations of the abutted portion 312 of the receiving frame 3 and the lid-side tapered surface 221 and the abutting portion 222 of the manhole lid 2 are different from those of the above-described embodiment.

  As shown in FIG. 4, the abutted portion 312 of the first modified example is configured with a tapered surface that is inclined outward as it goes upward, like the frame-side tapered surface 311. However, the inclination angle θ2 of the contacted portion 312 is set smaller than the inclination angle θ1 of the frame-side tapered surface 311. Further, the upward length of the manhole cover 2 on the cover-side tapered surface 221 is set to be substantially the same as the length of the manhole cover 2 facing upward on the frame-side tapered surface 311. A lower surface portion 223 extending toward the center of the manhole cover 2 is provided at the lower end portion of the lid-side tapered surface 221, and the cylindrical outer peripheral surface 2221 is connected to the center-side end portion of the lower surface portion 223. The cylindrical outer peripheral surface 2221 is configured by a tapered surface that is inclined outward as it goes upward, like the lid-side tapered surface 221. However, the inclination angle of the cylindrical outer peripheral surface 2221 is also set to θ2, which is smaller than the inclination angle θ1 of the lid-side tapered surface 221 as in the contacted portion 312. Thereby, a horizontal gap C <b> 1 is provided between the abutted portion 312 and the cylindrical outer peripheral surface 2221 and between the abutted portion 312 and the corner portion 2222. Note that the inclination angle of the cylindrical outer peripheral surface 2221 may be set to 0 degrees as indicated by the alternate long and short dash line in FIG.

  FIG. 5 is a diagram illustrating a portion corresponding to FIG. 2A in the second modification of the lid receiving frame set 10 illustrated in FIGS. 1 to 3. In the lid receiving frame set 10 of the second modified example, the configurations of the lid-side tapered surface 221 and the contact portion 222 in the manhole lid 2 are different from those in the above-described embodiment.

  As shown in FIG. 5, as in the first modification shown in FIG. 4, the length of the manhole lid 2 that extends upward on the lid-side tapered surface 221 is substantially the same as the length that extends upward of the frame-side tapered surface 311. Is set. The contact portion 222 includes a vertical wall portion 2223 extending downward from the lower surface portion 223 and a ridge portion 2224 protruding outward from a lower end portion of the vertical wall portion 2223. A corner 2222 is provided at the lower end of the tip. In the second modification, there is a horizontal gap C1 between the outer peripheral end of the ridge portion 2224 and the corner portion 2222 and the contacted portion 312, and the ridge portion 2224, the stop portion 313, There is a gap C2 in the vertical direction. In this modified example, in the initial support state shown in FIG. 5, the ridge portion 2224 and the stop portion 313 are in a horizontal posture, but the ridge portion 2224 and the stop portion 313 may be inclined with respect to each other. It is also possible to adopt a mode in which only one of them is inclined. In the second modification, when the manhole cover 2 is tilted to a certain angle, the corner portion 2222 is brought into contact with the contacted portion 312 and the manhole cover 2 is restricted from tilting more than the certain angle.

  Next, a second embodiment of the lid receiving frame set will be described.

  FIG. 6 is a diagram illustrating an aspect corresponding to FIG. 2 in the lid receiving frame set 11 of the second embodiment. Compared with the lid receiving frame set 1 of the first embodiment, the lid receiving frame set 11 of the second embodiment has a contact portion 222 provided closer to the center side of the manhole cover 2 than the lid side tapered surface 221, The point that the part 312 is provided inside the receiving frame 3 with respect to the frame side taper surface 311 is mainly different.

  As shown in FIG. 6A, the inner peripheral surface portion 31 of the receiving frame 3 in the second embodiment has a frame-side tapered surface 311, a gap forming portion 314, a stop surface portion 315, and an abutment from the ground G side to the underground side. The contact portion 312 is provided in the order of description. In the second embodiment, the stop portion 313 shown in FIG. 2 is not provided, but a stop portion may be provided below the contacted portion 312. The gap forming portion 314 is a cylindrical inner peripheral surface extending in the vertical direction from the lower end portion of the frame-side tapered surface 311. The stop surface portion 315 is a surface extending from the lower end portion of the gap forming portion 314 to the inside (right side in the drawing) of the receiving frame 3. The contacted portion 312 is connected to the inner end of the stop surface portion 315. That is, the abutted portion 312 is provided on the inner side of the receiving frame 3 with respect to the frame-side tapered surface 311.

  A lower surface portion 223 that extends from the lower end portion of the lid-side tapered surface 221 to the center side of the manhole lid 2 is provided between the lid-side tapered surface 221 and the contact portion 222 in the manhole lid 2. That is, the contact portion 222 is provided closer to the center of the manhole cover 2 than the cover-side tapered surface 221.

  FIG. 6A shows an initial support state in which the height position of the upper surface 21 a of the manhole cover 2 matches the height position of the upper end surface 32 of the receiving frame 3. In this initial support state, the stop surface portion 315 and the lower surface portion 223 are separated with a gap C3 in the vertical direction, and the contact portion 222 and the contacted portion 312 are separated with a gap C1 in the horizontal direction. doing. The gap C3 in the vertical direction is set smaller than the gap C1 in the horizontal direction. In the initial support state, the lower surface portion 223 and the stop surface portion 315 are horizontally opposed to each other, but the lower surface portion 223 and the stop surface portion 315 may be opposed to each other in an inclined state. It is good also as an aspect which inclines. For example, the lower surface portion 223 may be inclined downward toward the center side of the manhole cover 2.

  As shown in FIG. 6B, in the lid receiving frame set 11 of the second embodiment, when the manhole cover 2 is tilted to a certain angle, the corner portion 2222 comes into contact with the contacted portion 312 and the manhole cover 2 is fixed. It is regulated to tilt more than the angle. Here, the contact portion 222 in the second embodiment is provided on the center side of the manhole cover 2 with respect to the length of the lower surface portion 223, and on the center side of the manhole cover 2, and the contacted portion 312 is the stop surface portion 315. The length is provided inside the receiving frame 3 relative to the frame-side tapered surface 311. For this reason, as compared with the lid receiving frame set 1 of the first embodiment, it is possible to further suppress the manhole lid 2 from rising. Further, when the manhole cover 2 slides down with respect to the receiving frame 3 with the passage of the month and day, the lower surface portion 223 comes into contact with the stop surface portion 315, so that the slide down of the manhole cover 2 can be stopped.

  According to the lid receiving frame sets 10 and 11 described above, it is possible to suppress the sliding of the lid without requiring high dimensional accuracy.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope described in the claims. For example, in the above-described embodiment, the case where the lid receiving frame sets 10 and 11 are installed at a place where the ground G is horizontal has been described as an example. However, the lid receiving frame sets 10 and 11 are installed at a place where the ground G is inclined. Also good.

  In addition, even if it is the structural requirement contained only in each description of each embodiment and each modification demonstrated above, you may apply the structural requirement to another embodiment and another modification.

10, 11 Lid receiving frame set 2 Manhole cover 21a Upper surface 221 Lid side taper surface 222 Contact portion 223 Lower surface portion 3 Receiving frame 311 Frame side taper surface 312 Contacted portion 313 Stop portion 315 Stop surface portion C1, C2, C3 Clearance H Opening

Claims (3)

In a base structure lid receiving frame set comprising a receiving frame that defines an opening that leads to an underground structure, and a lid that closes the opening by being supported by the receiving frame,
The receiving frame is provided with a frame-side tapered surface inclined outward as it goes upward, and has a contacted portion below the frame-side tapered surface,
The lid body is inclined outward as it goes upward, a lid-side taper surface that fits the frame-side taper surface is provided on the outer peripheral side, and has a contact portion below the lid-side taper surface. Yes,
In the state where the lid supported by the receiving frame is horizontal with respect to the upper end surface of the receiving frame, the abutting portion is opposed to the contacted portion with a gap in the horizontal direction. A lid for an underground structure that is in contact with the contacted portion and restrains the lid from tilting more than the predetermined angle when the lid tilts to a certain angle with respect to the upper end surface. Receiving frame set. The receiving frame has a stop portion protruding inward below the contacted portion,
The stop portion is spaced downward from the contact portion of the lid body in a state where the height position of the upper surface of the lid body coincides with the height position of the upper end surface of the receiving frame. The lid receiving frame set for an underground structure according to claim 1, wherein The contact portion is provided closer to the center side of the lid body than the lid-side tapered surface,
The lid body has a lower surface portion between the lid-side tapered surface and the contact portion,
The abutted portion is provided inside the receiving frame from the frame-side tapered surface,
The receiving frame has a stop surface portion between the frame-side tapered surface and the contacted portion,
The stop surface portion is spaced downward from the lower surface portion of the lid body in a state where the height position of the upper surface of the lid body coincides with the height position of the upper end surface of the receiving frame. The lid receiving frame set for underground structures according to claim 1 or 2.

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