JP6839864B2 - Underground structure lid receiving frame set - Google Patents

Description

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

In places where underground structures such as underground buried objects and underground facilities in sewerage, water supply, electric power, gas, communication, etc. are connected to the ground, a receiving frame that defines an opening leading to the underground structure and being supported by this receiving frame. A lid receiving frame set for an underground structure may be installed with a lid that closes the opening. This underground structure receiving frame set is provided with a frame-side tapered surface that is inclined outward as it goes upward on the inner peripheral side of the receiving frame, and is provided on the outer peripheral side of the lid, and the lid side that is inclined outward as it goes upward. Those provided with a tapered surface are known. Hereinafter, the angle of inclination with respect to the direction orthogonal to the upper surface of the lid, which is horizontal to the upper end surface of the receiving frame, may be referred to as an inclination angle. The frame-side tapered surface and the lid-side tapered surface are set to have substantially the same inclination angle and come into surface contact with each other, whereby so-called taper fitting is performed. It is possible to suppress rattling of the lid. However, when a load is locally applied to the peripheral portion of the lid body, the portion of the lid body to which the load is applied is lowered, while the portion opposite to the portion to which the load is applied is raised. As a result, the lid may be fitted in a tilted state with respect to the receiving frame, that is, so-called sliding up may occur. Here, if both the inclination angle of the frame side tapered surface and the inclination angle of the lid side tapered surface are reduced (if both the frame side tapered surface and the lid side tapered surface are steeply inclined), the wedge effect becomes large and the lid body. It is possible to suppress the slip-up. However, the smaller the inclination angle between the frame-side tapered surface and the lid-side tapered surface, the easier it is for the lid to bite into the receiving frame. As a result, when a load is applied to the lid, the force with which the lid bites into the receiving frame becomes too strong, which causes a problem that it becomes difficult to open the lid. For this reason, a receiving frame set for an underground structure has been proposed in which an attempt is made to suppress the sliding up 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 lid receiving frame set for an underground structure described in Patent Document 1 is provided with a plurality of fitting portions in which a part of the outer peripheral surface of the lid contacts 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 located below the upper fitting portion are provided. In the lid receiving frame set for underground structures described in Patent Document 1, in both the upper fitting portion and the lower fitting portion, a part of the inner peripheral surface of the receiving frame is a part of the outer peripheral surface of the lid body. We are trying to prevent the lid from slipping up by bringing it into contact with each other.

Further, in the lid receiving frame set for an underground structure described in Patent Document 2, a frame-side upper tapered surface is formed on the upper part of the inner peripheral surface of the receiving frame, and a frame-side lower tapered surface is formed on the lower part of the inner peripheral surface of the receiving frame. Is forming. Further, an upper corner portion that makes line contact with the upper tapered surface on the frame side in the circumferential direction is provided on the upper portion of the outer peripheral surface of the lid, and the lower portion of the outer peripheral surface of the lid makes linear contact with the lower tapered surface on the frame side in the circumferential direction. A lower corner is provided. In the lid receiving frame set for underground structures described in Patent Document 2, when a load is applied to the lid body, the inner peripheral side surface of the receiving frame is plastically deformed by the upper corner portion and the lower corner portion, so that the lid body is displaced. I'm trying to control the rise.

However, the lid receiving frame set for an underground structure described in Patent Document 1 has a part of the inner peripheral surface of the receiving frame and one of the outer peripheral surfaces of the outer frame in both the upper fitting portion and the lower fitting portion. It is necessary to bring the parts into contact with each other, and high accuracy is required for the dimensions of the inner peripheral surface of the receiving frame and the dimensions of the outer peripheral surface of the outer frame. Further, also in the lid receiving frame set for underground structures described in Patent Document 2, when the upper corner portion and the lower corner portion of the lid body appropriately contact the inner peripheral surface of the receiving frame and a load is applied to the lid body. Similarly, in order to plastically deform the inner peripheral side surface of the receiving frame by the upper corner portion and the lower corner portion, high dimensional accuracy is required. Therefore, it is difficult to manufacture both the lid receiving frame set for the underground structure described in Patent Document 1 and the lid receiving frame set for the underground structure described in Patent Document 2.

Japanese Patent No. 51611148 Japanese Unexamined Patent Publication No. 2013-7198

There is a demand for a lid receiving frame set for underground structures that is less likely to cause defects.

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 less likely to cause a defect.

The lid receiving frame set for an underground structure of the present invention that solves the above object is an underground structure including a receiving frame that defines an opening connected to the underground structure and a lid that closes the opening by being supported by the receiving frame. In the lid receiving frame set
The receiving frame is provided with a frame-side tapered surface that is inclined outward as it goes upward, and is provided with a contacted portion below the frame-side tapered surface and inwardly below the contacted portion. It has a protruding stop and
The lid body is inclined outward as it goes upward, and a lid-side tapered surface that fits into the frame-side tapered surface is provided on the outer peripheral side, and has a contact portion below the lid-side tapered surface. Yes,
The stop portion is separated 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 by a predetermined distance in the downward direction. When the height position of the upper surface of the lid is lower than the height position of the upper end surface of the receiving frame by the predetermined distance, the corresponding contact portion abuts and the height position of the upper surface of the lid is changed. It regulates lowering,
In a 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 faces the abutted portion with a horizontal gap, while the abutting portion of the receiving frame. When the lid is tilted to a certain angle with respect to the upper end surface, it comes into contact with the contacted portion regardless of whether it is in contact with the stop portion or separated from the stop portion. It regulates the lid from tilting beyond the fixed angle.
The lid-side tapered surface extends downward from the frame-side tapered surface.

Further, in the lid receiving frame set for an underground structure of the present invention, the upward length of the frame-side tapered surface may be shorter than the upward length of the contacted portion.

According to the present invention, it is possible to provide a lid receiving frame set for an underground structure that is less likely to cause defects.

(A) is a cross-sectional view of a lid receiving frame set for an underground structure according to an embodiment of the present invention, and (b) is a plan view of a lid receiving frame set for an underground structure shown in (a). (A) is an enlarged view showing part A of FIG. 1 (a) in an enlarged manner, and (b) is a view showing how the manhole cover 2 shown in (a) is tilted to a certain angle. It is a figure for demonstrating how the manhole cover slides down from the initial support state shown in FIG. It is a figure which shows the part corresponding to FIG. 2A in the 1st modification of the lid receiving frame set shown in FIGS. 1 to 3. FIG. It is a figure which shows the part corresponding to FIG. 2A in the 2nd modification of the lid receiving frame set shown in FIGS. 1 to 3. FIG. It is a figure which shows the aspect corresponding to FIG. 2 in the lid receiving frame set of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1A is a cross-sectional view of an embodiment of the underground structure lid receiving frame set 10, and FIG. 1B is a plan view of the underground structure lid receiving frame set 10 shown in FIG. 1A. Is. Hereinafter, the lid receiving frame set 10 for underground structures will be 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 of FIG. 1B. Further, FIG. 1A shows the ground G, and FIG. 1B omits the ground G.

FIG. 1 shows a lid receiving frame set 10 including a manhole cover 2 corresponding to one embodiment of a lid and a receiving frame 3 formed in an annular shape supporting the manhole cover 2. The drainage pipe for sewerage, 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 drainage pipe for sewerage. Both sewer drainage pipes and manholes correspond to underground structures. A manhole is formed as a vertical hole from a sewer drainage pipe to the ground surface by a skeleton made by stacking ready-made concrete molded products. The receiving frame 3 is provided on the frame thereof, and defines an opening H connected to a manhole which is an underground structure.

The manhole cover 2 has a circular shape in a plan view that opens and closes the opening H connected to the manhole, which is an underground structure, and the manhole cover 2 shown in FIG. 1 closes the opening H. The manhole cover 2 shown in FIG. 1 is made of cast iron formed by casting. 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 portion 21, an outer peripheral surface portion 22 provided on the outer peripheral portion of the disk portion 21, and ribs 23 protruding downward from the disk portion 21 and arranged in a grid shape. The rib 23 is integrally molded with the disk portion 21 and the outer peripheral surface portion 22 at the time of casting the manhole cover 2 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 tubular shape having an inner peripheral surface portion 31 and an upper end surface 32 and formed in an annular shape in a plan view. The inner peripheral surface portion 31 will be described in detail later.

In FIG. 1A, the upper part of the figure is the above-ground side, and the lower part of the figure is the underground side. In the present embodiment, an embodiment in which the receiving frame 3 is installed on the horizontal ground G will be described as an example. The upper end surface 32 of the receiving frame 3 has an endless shape, 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 the initial state in which the lid receiving frame set 10 is installed, and the manhole cover 2 supported by the receiving frame 3 is horizontal to the receiving frame 3 and is above the receiving frame 3. It shows a state in which the height position of the upper surface 21a of the disk portion 21 corresponding to the upper surface of the manhole cover 2 coincides with the height position of the end surface 32. 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 the present embodiment, as described above, since the receiving frame 3 is installed horizontally, the upper surface 21a of the disk portion 21 is also horizontal. Note that in FIG. 1, a hinge member that rotatably connects the manhole cover 2 to the receiving frame 3 and a lock member that maintains the state in which the manhole cover 2 closes the opening H are omitted.

FIG. 2A is an enlarged view showing part A of FIG. 1A in an enlarged manner.

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 in the order described from the ground G side to the underground side. .. The frame-side tapered surface 311 is a tapered inner peripheral surface that inclines outward as it goes upward and is connected to the upper end surface 32, and the inclination angle θ1 is set to about 5 to 12 degrees. In addition, in FIGS. 2 and 3 showing the present embodiment, and FIGS. 4 to 6 showing the modified example and the second embodiment, the tilt angle is larger than the actual tilt angle so that the tilted state can be easily understood. It shows how it 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 orthogonal to the line connecting the upper end surfaces 32 of the receiving frame 3, and has an inclination angle of 0 degrees. 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. As in the modified example 1 described later, the contacted portion 312 may also be inclined outward as it goes upward, but it is hit due to the arrangement relationship with the contacted portion 222 described later. 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 that protrudes in a ring shape from a position below the contacted portion 312 to the inside of the receiving frame 3. It should be noted that the stop portions 313 do not necessarily have to be provided in a ring shape, and a plurality of stop portions 313 may be provided in the circumferential direction of the inner peripheral surface portion 31 at predetermined intervals.

A lid-side tapered surface 221 is provided on the outer peripheral surface portion 22 of the manhole cover 2, and a contact portion 222 is provided on the lower side of the lid-side tapered surface 221. The lid-side tapered surface 221 is a tapered outer peripheral surface that inclines outward as it goes upward and is connected to the upper surface 21a, and the inclination angle is set to θ1 which is substantially the same as the frame-side tapered surface 311. Further, the lid-side tapered surface 221 is a surface whose upward length is longer than the upward length of the frame-side tapered surface 311. The contact portion 222 has a cylindrical outer peripheral surface 2221 formed of a cylindrical outer peripheral surface, and a corner portion 2222 provided at a 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 degrees.

In the initial support state shown in FIG. 2A, the height position of the upper surface 21a of the manhole cover 2 coincides with the height position of the upper end surface 32 of the receiving frame 3 as described above. Further, the lid-side tapered surface 221 is in surface contact with substantially the entire surface of the frame-side tapered surface 311, and the frame-side tapered surface 311 and the lid-side tapered surface 221 are tapered and fitted. As described above, since the length of the lid-side tapered surface 221 upward is longer than that of the frame-side tapered surface 311, the lower end side of the lid-side tapered surface 221 is a portion that does not come into surface contact with the frame-side tapered surface 311. Is occurring. The contact portion 222 faces the contacted portion 312 with a horizontal gap C1. Further, the contact portion 222 is separated from the stop portion 313 of the receiving frame 3 in the vertical direction by leaving 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 how the manhole cover 2 shown in FIG. 2A is tilted to a certain angle.

When a load is locally applied to the peripheral portion of the manhole cover 2, the loaded portion of the manhole cover 2 is lowered, while the portion opposite to the loaded portion is raised and the manhole cover 2 is tilted. In FIG. 2B, a load is locally applied to the peripheral portion on the right side of the manhole cover 2, which is not shown, and the left portion of the manhole cover 2 is raised and the manhole cover 2 is tilted by a certain angle with respect to the receiving frame 3. It shows the situation. As shown in FIG. 2B, when the manhole cover 2 is tilted by a certain angle with respect to the receiving frame 3, the corner portion 2222 at the contact portion 222 of the manhole cover 2 comes into contact with the contacted portion 312 of the receiving frame 3. ing. As a result, the manhole cover 2 is restricted from tilting more than a certain angle shown in FIG. 2B, and the manhole cover 2 can be prevented from slipping up.

Here, in the initial support state shown in FIG. 2A, a horizontal gap C1 and the contact portion 222 are formed in the contact portion 312 between the contact portion 222 and the contact portion 312. Strictness is not so required for the constant angle of contact. Therefore, high dimensional accuracy is not required for the contact portion 222 and the contacted portion 312, and the lid receiving frame set 10 can be easily manufactured.

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

When the state in which the load is applied to the manhole cover 2 is repeated, the manhole cover 2 slides down from the initial support state shown in FIG. 2 to the receiving frame 3, as shown in FIG. 3A, and the receiving frame 3 The height position of the upper surface 21a 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 When tilted, the corner portion 2222 of the contact portion 222 comes into contact with the contacted portion 312 of the receiving frame 3. As a result, the manhole cover 2 can be prevented from slipping up.

Further, when the state in which the load is repeatedly applied to the manhole cover 2 is repeated, the manhole cover 2 is further slid down, and as shown in FIG. 3 (b), the contact portion 222 eventually comes into contact with the stop portion 313. .. As a result, the manhole cover 2 can be stopped from sliding down. Further, even in a state where the contact portion 222 is in contact with the stop portion 313, when a load is locally applied 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 becomes the receiving frame 3. Since it comes into contact with the contacted portion 312, rattling of the manhole cover 2 and the like 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 10 of the first embodiment shown in FIGS. 1 to 3 will be mainly described, and the configurations described so far will be mainly described. Components having the same name as the element name may be described with the reference numerals used so far, and duplicate description may be omitted.

FIG. 4 is a diagram showing a portion corresponding to FIG. 2A in the first modification of the lid receiving frame set 10 shown in FIGS. 1 to 3. In the lid receiving frame set 10 of the first modification, the configurations of the contacted portion 312 of the receiving frame 3 and the lid-side tapered surface 221 and the contact portion 222 of the manhole cover 2 are different from those of the above-described embodiment.

As shown in FIG. 4, the contacted portion 312 of the first modification is composed of a tapered tapered surface that is inclined outward as it goes upward, similarly to the frame-side tapered surface 311. However, the inclination angle θ2 of the contacted portion 312 is set to be smaller than the inclination angle θ1 of the frame-side tapered surface 311. Further, the upward length of the manhole cover 2 on the lid side tapered surface 221 is set to be substantially the same as the upward length of 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 a cylindrical outer peripheral surface 2221 is connected to the central end portion of the lower surface portion 223. The cylindrical outer peripheral surface 2221 is composed of a tapered tapered surface that is inclined outward as it goes upward, similarly to the lid-side tapered surface 221. However, the inclination angle of the outer peripheral surface 2221 of the cylinder is also set to θ2, which is smaller than the inclination angle θ1 of the tapered surface 221 on the lid side, similarly to the contacted portion 312. As a result, there is a horizontal gap C1 between the contacted portion 312 and the outer peripheral surface of the cylinder 2221, and between the contacted portion 312 and the corner portion 2222. As shown by the alternate long and short dash line in FIG. 4, the inclination angle of the outer peripheral surface of the cylinder 2221 may be set to 0 degrees.

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

As shown in FIG. 5, as in the first modification shown in FIG. 4, the upward length of the manhole cover 2 on the lid side tapered surface 221 is substantially the same as the upward length of the frame side tapered surface 311. It is set. Further, the contact portion 222 has a vertical wall portion 2223 extending downward from the lower surface portion 223 and a ridge portion 2224 protruding outward from the lower end portion of the vertical wall portion 2223. A corner portion 2222 is provided at the lower end portion at the tip end. In the second modification, there is a horizontal gap C1 between the outer peripheral end portion and the corner portion 2222 of the ridge portion 2224 and the contacted portion 312, and the ridge portion 2224 and the stop portion 313 There is a vertical gap C2 between the two. 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 with each other, but even if the ridge portion 2224 and the stop portion 313 are tilted with each other. Often, a mode in which only one of them is inclined may be adopted. In the second modification, 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 restricted from being tilted from a certain angle.

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

FIG. 6 is a diagram showing a mode corresponding to FIG. 2 in the lid receiving frame set 11 of the second embodiment. In the lid receiving frame set 11 of the second embodiment, the contact portion 222 is provided on the center side of the manhole cover 2 with respect to the lid side tapered surface 221 as compared with the lid receiving frame set 10 of the first embodiment, and is in contact with the lid receiving frame set 11. The main difference is that the portion 312 is provided inside the receiving frame 3 with respect to the frame-side tapered surface 311.

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 a contact from the ground G side to the underground side. The contact portions 312 are 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 of the receiving frame 3 (on the right side in the drawing). The contacted portion 312 is connected to the inner end portion of the stop surface portion 315. That is, the contacted portion 312 is provided inside the receiving frame 3 with respect to the frame-side tapered surface 311.

In the manhole cover 2, a lower surface portion 223 extending from the lower end portion of the lid side tapered surface 221 to the center side of the manhole cover 2 is provided between the lid side tapered surface 221 and the contact portion 222. That is, the contact portion 222 is provided on the center side of the manhole cover 2 with respect to the lid side tapered surface 221.

FIG. 6A shows an initial support state in which the height position of the upper surface 21a of the manhole cover 2 coincides with 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 from each other with a vertical gap C3, and the contact portion 222 and the contacted portion 312 are separated from each other with a horizontal gap C1. doing. The vertical gap C3 is set to be larger than the horizontal gap C1. In the initial support state, the lower surface portion 223 and the stop surface portion 315 are in a posture of horizontally facing each other, but the lower surface portion 223 and the stop surface portion 315 may be opposed to each other in an inclined state, and only one of them may be opposed to each other. May be an aspect of inclining. 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 abuts on the contacted portion 312, and the manhole cover 2 is constant. Tilt rather than angle is regulated. Here, the contact portion 222 in the second embodiment is provided on the center side of the manhole cover 2 with respect to the lid side tapered surface 221 by the length of the lower surface portion 223, and the contact portion 312 is the stop surface portion 315. It is provided inside the receiving frame 3 with respect to the frame-side tapered surface 311 by the length. Therefore, as compared with the lid receiving frame set 10 of the first embodiment, the manhole cover 2 can be further suppressed from slipping up. Further, when the manhole cover 2 slides down with respect to the receiving frame 3 as the months and days elapse, the lower surface portion 223 abuts on the stop surface portion 315, so that the manhole cover 2 can be stopped from sliding down.

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

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, in the above embodiment, the mode in which 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, but the lid receiving frame sets 10 and 11 are installed at a place where the ground G is inclined. May be good.

It should be noted that even if the constituent requirements are included only in the description of each embodiment and each modified example described above, the constituent requirements may be applied to other embodiments or other modified examples.

Further, the lid receiving frame set for an underground structure described so far is for an underground structure including a receiving frame that defines an opening connected to the underground structure and a lid that closes the opening by being supported by the receiving frame. In the lid receiving frame set
The receiving frame is provided with a frame-side tapered surface that is inclined outward as it goes upward on the inner peripheral side, and has a contacted portion below the frame-side tapered surface.
The lid body is inclined outward as it goes upward, and a lid-side tapered surface that fits into the frame-side tapered surface is provided on the outer peripheral side, and the contact portion is provided below the lid-side tapered surface. It has ribs protruding downward from the back surface with respect to the upper surface.
The rib is connected to the contact portion, and the rib is connected to the contact portion.
In a state where the lid supported by the receiving frame is horizontal to the upper end surface of the receiving frame, the contact portion faces the contacted portion with a horizontal gap, while the abutting portion of the receiving frame. When the lid is tilted to a certain angle with respect to the upper end surface, it comes into contact with the contacted portion and restricts the lid from tilting from the constant angle, and is below the connection point of the rib. It may be characterized in that it is prominent.

Further, in this underground structure lid receiving frame set, the receiving frame has a stop portion protruding inward from the contacted portion and a wall thickness below the stop portion and thicker than above the stop portion. It has an extending part and
The stop portion is separated 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 by a predetermined distance in the downward direction. When the height position of the upper surface of the lid is lower than the height position of the upper end surface of the receiving frame by the predetermined distance, the corresponding contact portion abuts and the height position of the upper surface of the lid is changed. It may be regulated to be lower than that.

Further, in a lid receiving frame set for an underground structure, which includes a receiving frame that defines an opening connected to the 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 that is inclined outward as it goes upward on the inner peripheral side, and has a contacted portion below the frame-side tapered surface.
The lid body is inclined outward as it goes upward, and a lid-side tapered surface that fits into the frame-side tapered surface is provided on the outer peripheral side, and has a contact portion below the lid-side tapered surface. Yes,
In a state where the lid supported by the receiving frame is horizontal to the upper end surface of the receiving frame, the contact portion faces the contacted portion with a horizontal gap, while the abutting portion of the receiving frame. A lid for an underground structure, characterized in that when the lid is tilted to a certain angle with respect to the upper end surface, the lid abuts on the contacted portion and the lid is restricted from tilting from the constant angle. It may be a receiving frame set.

Here, the lid may be round (circular in plan view) or square (rectangular in plan view). The horizontal direction means the outer-inner direction. For example, when the lid is round, the horizontal direction corresponds to the radial direction. The frame-side tapered surface may be provided on the entire inner circumference of the lid, or may be provided on a part of the inner circumference. For example, the frame-side tapered surface may be provided at predetermined intervals in the circumferential direction of the inner circumference. Further, the inclination angle of the frame-side tapered surface and the inclination angle of the lid-side tapered surface may be the same. In this case, the frame-side tapered surface and the lid-side tapered surface are so-called tapered fits. Further, the contacted portion may have a tapered 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 abutting portion has a peripheral surface that faces substantially parallel to the abutted portion in a state where the lid body supported by the receiving frame is horizontal 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. Further, 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 if the lid is tilted from a state of being horizontally supported with respect to the upper end surface of the receiving frame. Further, in a state where the lid is horizontally supported with respect to the upper end surface of the receiving frame, the contact portion may have protrusions or ridges protruding toward the contacted portion. Often, the contacted portion may have protrusions or ridges protruding toward the abutted portion.

According to this set of lid receiving frames for underground structures, when the lid body is tilted to the certain 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 becomes constant. Tilt rather than angle is regulated. As a result, it is possible to suppress the sliding up of the lid body. Further, in a state where the lid body is horizontally supported with respect to the upper end surface of the receiving frame, the contact portion and the contacted portion do not contact each other, and there is a gap in the horizontal direction of the lid body. .. Further, when the lid is tilted, it is sufficient that the contact portion comes into contact with the contacted portion as long as the lid does not slide up, so that the constant angle does not need to be pinpointed. It should be within a certain range. For these reasons, high accuracy is not required for the dimensions of the contact portion and the contacted portion, and manufacturing becomes easy. By adjusting the inclination angle between the frame-side tapered surface and the lid-side tapered surface, it is possible to adjust the force with which the lid body bites into the receiving frame. Further, the frame-side tapered surface and the lid-side tapered surface may form a relationship of forming an upper fitting portion and a lower fitting portion as shown in Patent Document 1, or may occur accidentally. However, this lid receiving frame set for an underground structure is easy to manufacture because it is possible to suppress the sliding up of the lid body without relying on this relationship.

Further, the receiving frame has a stop portion protruding inward below the contacted portion.
Even if the stop portion is separated downward from the contact portion in 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 doing so, when the entire lid body is lowered from the 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, so-called sliding down occurs, the contact portion Can stop the sliding down by contacting the stop portion.

Further, in this lid receiving frame set for an underground structure, the contact portion is provided on the center side of the lid body with respect to the tapered surface on the lid side.
The lid has a lower surface portion between the lid-side tapered surface and the contact portion, and has a lower surface portion.
The contacted portion is provided inside the receiving frame with respect to the tapered surface on the frame side.
The receiving frame has a stop surface portion between the frame-side tapered surface and the contacted portion.
The stop surface portion may be one that is separated downward from the lower surface portion of the lid body in which 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. ..

Since the abutting portion is provided on the center side of the lid body with respect to the tapered surface on the lid side, and the abutted portion is provided on the inside of the receiving frame with respect to the tapered surface on the frame side. When the corresponding contact portion provided on the center side of the lid abuts on the contacted portion provided inside the receiving frame, the sliding up of the lid can be further suppressed. Further, the lower surface portion abuts on the stop surface portion, so that the sliding down of the lid body can be stopped.

Further, the lid receiving frame set for an underground structure described so far is for an underground structure including a receiving frame that defines an opening connected to the underground structure and a lid that closes the opening by being supported by the receiving frame. In the lid receiving frame set
The receiving frame is provided with a frame-side tapered surface that is inclined outward as it goes upward, and has a contacted portion that is inclined outward as it goes downward and upward from the frame-side tapered surface. ,
The lid body is inclined outward as it goes upward, a lid-side tapered surface that fits into the frame-side tapered surface is provided on the outer peripheral side, and a contact portion is connected to the lower end of the lid-side tapered surface. Yes,
When the lid supported by the receiving frame is horizontal to the upper end surface of the receiving frame, the abutting portion faces the abutted portion with a horizontal gap, while the abutting portion of the receiving frame. When the lid is tilted to a certain angle with respect to the upper end surface, it comes into contact with the contacted portion and restricts the lid from tilting from the constant angle, which is the same as the contacted portion. It has an outer peripheral surface that is continuously inclined outward as it goes upward at a constant inclination angle.
The lid-side tapered surface extends downward from the frame-side tapered surface.

Further, in this lid receiving frame set for an underground structure, the lid-side tapered surface may be continuously inclined at a constant inclination angle from the lower end to the upper end.

Further, in this set of lid receiving frames for underground structures, the inclination angle of the contacted portion may be smaller than the inclination angle of the tapered surface on the frame side.

Further, the upward length of the contacted portion may be longer than the upward length of the frame-side tapered surface.
Further, the lid receiving frame set for an underground structure described so far is for an underground structure including a receiving frame that defines an opening connected to the underground structure and a lid that closes the opening by being supported by the receiving frame. In the lid receiving frame set
The receiving frame is provided with a frame-side tapered surface that is inclined outward as it goes upward on the inner peripheral side, and has a contacted portion below the frame-side tapered surface.
The lid body is inclined outward as it goes upward, and a lid-side tapered surface that fits into the frame-side tapered surface is provided on the outer peripheral side, and has a contact portion below the lid-side tapered surface. Yes,
In a state where the lid supported by the receiving frame is horizontal to the upper end surface of the receiving frame, the contact portion faces the contacted portion with a horizontal gap, while the abutting portion of the receiving frame. When the lid is tilted to a certain angle with respect to the upper end surface, it comes into contact with the contacted portion and restricts the lid from tilting from the constant angle.
The lid-side tapered surface extends downward from the frame-side tapered surface.
Further, in this lid receiving frame set for an underground structure, the lid-side tapered surface may be continuously inclined at a constant inclination angle from the lower end to the upper end.
Further, the contacted portion may extend in the vertical direction.

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

Claims (2)

In a lid receiving frame set for an underground structure, which includes a receiving frame that defines an opening connected to the 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 that is inclined outward as it goes upward, and is provided with a contacted portion below the frame-side tapered surface and inward below the contacted portion. It has a protruding stop and
The lid body is inclined outward as it goes upward, and a lid-side tapered surface that fits into the frame-side tapered surface is provided on the outer peripheral side, and has a contact portion below the lid-side tapered surface. Yes,
The stop portion is separated 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 by a predetermined distance in the downward direction. When the height position of the upper surface of the lid is lower than the height position of the upper end surface of the receiving frame by the predetermined distance, the corresponding contact portion abuts and the height position of the upper surface of the lid is changed. It regulates lowering,
In a state where the lid supported by the receiving frame is horizontal to the upper end surface of the receiving frame, the contact portion faces the contacted portion with a horizontal gap, while the abutting portion of the receiving frame. When the lid is tilted to a certain angle with respect to the upper end surface, it comes into contact with the contacted portion regardless of whether it is in contact with the stop portion or separated from the stop portion. It regulates the lid from tilting beyond the fixed angle.
A lid receiving frame set for an underground structure, wherein the lid-side tapered surface extends downward from the frame-side tapered surface. The lid receiving frame set for an underground structure according to claim 1, wherein the upward length of the frame-side tapered surface is shorter than the upward length of the contacted portion.

Images