JP7084064B2 - Cover receiving frame set for underground structures - 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 underground structures may be installed with a lid that closes the opening. In the present patent application, a state in which the lid is supported by the receiving frame and the opening is closed (a state in which the lid is fitted in the receiving frame) may be referred to as a closed state. Further, in the following description, the lid receiving frame set for an underground structure may be abbreviated as a lid receiving frame set.

The lid receiving frame set is provided with an inner peripheral surface inclined at a certain angle in the direction in which the inner diameter expands upward on the inner circumference of the receiving frame, and a tapered surface inclined outward on the outer circumference of the lid. Is known to be provided. Hereinafter, in the closed state, the angle of inclination with respect to the direction orthogonal to the front surface of the lid horizontal to the upper end surface of the receiving frame may be referred to as an inclination angle. The inclination angles of the inner peripheral surface of the receiving frame and the tapered surface of the lid are set to be substantially the same, and the tapered surface of the lid comes into surface contact with the inner peripheral surface of the receiving frame in the closed state. This is intended to secure a sufficient contact area between the inner peripheral surface of the receiving frame and the tapered surface of the lid, prevent excessive biting of the lid into the receiving frame, and ensure the ease of opening the lid. be.

Here, in order to bring the tapered surface of the lid into contact with the inner peripheral surface of the receiving frame without a gap, high dimensional accuracy is required for the receiving frame and the lid. However, it is generally difficult to bring the tapered surface of the lid into contact with the inner peripheral surface of the receiving frame without a gap due to manufacturing errors of the receiving frame and the lid, which are cast products. Further, in the closed state, sand or the like often enters between the inner peripheral surface of the receiving frame and the tapered surface of the lid. For these reasons, a gap is formed between the inner peripheral surface of the receiving frame and the tapered surface of the lid, and the lid tends to rattle with respect to the receiving frame. Therefore, a lid receiving frame set for preventing rattling of the lid has been proposed (see, for example, Patent Document 1 and the like).

In the lid receiving frame set described in Patent Document 1, the inner peripheral surface of the receiving frame is composed of a receiving frame first surface portion and a receiving frame second surface portion having a smaller inclination angle than the receiving frame first surface portion. Further, on the outer peripheral surface of the lid, a first surface portion of the lid and a second surface portion of the lid having a smaller inclination angle than the first surface portion of the lid are provided. Then, in the closed state, the first surface portion of the lid is supported by the first surface portion of the receiving frame to suppress the biting of the lid body, and the second surface portion of the lid and the second surface portion of the receiving frame are pressed against each other by the pressing force due to elastic deformation. This is an attempt to suppress the rattling of the lid.

However, in the lid receiving frame set described in Patent Document 1, the inner peripheral surface of the receiving frame is composed of a receiving frame first surface portion and a receiving frame second surface portion having different inclination angles. For this reason, the manufacturing cost is higher than that of a receiving frame having an inner peripheral surface inclined at a certain angle. Therefore, a lid receiving frame set has been proposed in which an attempt is made to suppress rattling of the lid by using a receiving frame having an inner peripheral surface inclined at a certain angle (see, for example, Patent Document 2 and the like).

In the lid receiving frame set described in Patent Document 2, a plurality of protruding portions having corner portions are provided on the outer periphery of the lid body at intervals in the height direction. Then, in the closed state, these corners are brought into linear contact with the inner peripheral surface in the circumferential direction of the inner peripheral surface to plastically deform a part of the inner peripheral surface, thereby suppressing rattling of the lid body. It is something to try.

International Publication WO2014 / 126239 Japanese Unexamined Patent Publication No. 2012-057435

However, in the lid receiving frame set described in Patent Document 2, for example, in an installation environment in which an excessive load is constantly applied to the lid, the corners of the lid excessively bite into the receiving frame to open the lid. There is a possibility that it will be difficult, and there is room for improvement in terms of suppressing the biting of the lid.

In view of the above circumstances, the present invention provides a lid receiving frame set for an underground structure that suppresses the manufacturing cost of the receiving frame, suppresses rattling of the lid body, and suppresses excessive biting of the lid body in a well-balanced manner. The purpose.

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 is supported by the receiving frame to close the opening. In the lid receiving frame set
The receiving frame has a cylindrical frame body, and has a cylindrical frame body.
The frame body has an inner peripheral surface that is provided on the inner circumference of the frame body and is inclined at a constant angle in a direction in which the inner diameter of the frame body expands upward.
The lid has a top plate portion, an annular wall portion surrounding the top plate portion, and a lid rib provided on the back surface of the top plate portion and connected to the inner circumference of the annular wall portion.
The annular wall portion has an upper contact portion and a lower contact portion provided at intervals in the height direction on the outer periphery thereof.
One of the upper contact portion and the lower contact portion is in surface contact with the inner peripheral surface in the closed state.
The other of the upper contact portion and the lower contact portion is in surface contact with the inner peripheral surface in the closed state, or linearly contacts the inner peripheral surface in the circumferential direction of the inner peripheral surface. To do
The lid rib is characterized in that the lower end of the portion connected to the annular wall portion is located above the lower contact portion.

In the lid receiving frame set for an underground structure of the present invention, the lid rib may have a lower end of a portion connected to the annular wall portion located below the upper contact portion.

Further, in the lid receiving frame set for an underground structure of the present invention, the upper contact portion may be in surface contact with the inner peripheral surface in the closed state.

According to the present invention, it is possible to provide a lid receiving frame set for an underground structure that suppresses the manufacturing cost of the receiving frame, suppresses rattling of the lid body, and suppresses excessive biting of the lid body in a well-balanced manner.

(A) is a cross-sectional view of an embodiment of a lid receiving frame set, and (b) is a plan view of a lid receiving frame set for an underground structure shown in (a). (A) is a back view of the manhole cover shown in FIG. 1, and (b) is a diagram showing a modified example of the manhole cover shown in (a). (A) is an enlarged view showing the part A of FIG. 1 (a) in an enlarged manner, and (b) is a diagram showing a modified example of (a). (A) is a diagram showing a state corresponding to FIG. 3 (a) in the lid receiving frame set of the second embodiment, and (b) is a diagram showing a modified example of (a). (A) is a diagram showing a state corresponding to FIG. 3 (a) in the lid receiving frame set of the third embodiment, and (b) is a diagram showing a modified example of (a).

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

1 (a) is a cross-sectional view of an embodiment of a lid receiving frame set 10, and FIG. 1 (b) is a plan view of the lid receiving frame set 10 shown in FIG. 1 (a). The cross-sectional view shown in FIG. 1 (a) is a cross-sectional view taken along the line BB of FIG. 1 (b). 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 an embodiment of a lid and a receiving frame 3 for supporting the manhole cover 2. The sewerage drainage 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 sewerage drainage pipe. Both sewer drains 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 movably 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, for example, made of FCD700, which is 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 has a disk-shaped top plate portion 21, an annular wall portion 22 provided on the outer peripheral portion of the top plate portion 21 and surrounding the top plate portion 21, and a lid protruding downward from the back surface 21b of the top plate portion 21. It is equipped with a rib 23.

2 (a) is a back view of the manhole cover 2 shown in FIG. 1, and FIG. 2 (b) is a diagram showing a modified example of the manhole cover 2 shown in FIG. 1 (a).

As shown in FIG. 2A, the lid ribs 23 provided on the back surface 21b of the top plate portion 21 are formed in a grid shape, and their respective ends are connected to the inner peripheral 222 of the annular wall portion 22. be. Further, as shown in FIG. 1A, the height of the central portion of the lid rib 23 is constant, but the height of the outer peripheral portion decreases toward the inner peripheral 222 of the annular wall portion 22, and the outer peripheral portion becomes annular. The height of the portion of the wall portion 22 connected to the inner circumference 222 is formed to be the lowest. The lid rib 23 is integrally formed with the top plate portion 21 and the annular wall portion 22 when the manhole cover 2 is cast for the purpose of increasing the strength of the manhole cover 2.

The configuration of the lid rib 23 is not particularly limited as long as it is connected to the inner peripheral 222 of the annular wall portion 22. For example, as shown in FIG. 2B, a circular convex portion 24 is provided in the center of the back surface 21b of the top plate portion 21, and extends radially from the convex portion 24 and is connected to the inner peripheral 222 of the annular wall portion 22. It is also possible to adopt the lid rib 23 to be used. In addition, in FIGS. 1 and 2, the hinge member for rotatably connecting the manhole cover 2 to the receiving frame 3 and the lock member for maintaining the state in which the manhole cover 2 closes the opening H are omitted. The annular wall portion 22 will be described in detail later.

As shown in FIG. 1, the receiving frame 3 has a cylindrical frame main body 31 formed in an annular shape in a plan view, a lower flange portion 32 protruding outward from the lower end portion of the frame main body 31, and a lower flange portion 32. It has a frame rib 33 provided on the upper surface of the above. In the present embodiment, a conventional general receiving frame 3 is adopted, and the inner peripheral portion 311 of the frame main body 31 has an inner peripheral surface inclined at a constant angle in a direction in which the inner diameter of the frame main body 31 expands upward. It has 3111 (see FIG. 3A). The details of the inner peripheral surface 3111 will be described later.

Like the manhole cover 2, the receiving frame 3 is made of cast iron and is made of cast iron, but the material is different from that of the receiving frame 3. The receiving frame 3 is composed of, for example, FCD600, as opposed to the manhole cover 2 made of FCD700. is doing. The reason is that unlike the manhole cover 2, the receiving frame 3 has few parts to which a direct load is directly applied, and emphasizes elongation rather than tensile strength to enhance impact resistance.

As shown in FIG. 1 (b), a plurality of frame ribs 33 (12 in the figure) are provided at predetermined intervals in the circumferential direction of the lower flange portion 32, and each frame rib 33 is connected to the outer periphery. It extends radially from surface 313. Further, as shown in FIG. 1A, the frame rib 33 is formed in a shape in which the portion connected to the outer peripheral surface 313 of the frame main body 31 is the highest and the height decreases toward the outside.

In FIG. 1 (a), the upper part of the figure is the 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 312 of the frame main body 31 has an endless shape, and the upper end surface 312 is continuous with the ground G without a step. That is, the upper end surface 312 of the frame main body 31 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 closed 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 the frame main body. It shows a state in which the height position of the front surface 21a of the top plate portion 21 in the manhole cover 2 coincides with the height position of the upper end surface 312 of the 31. In the present embodiment, as described above, since the receiving frame 3 is installed horizontally, the front surface 21a of the top plate portion 21 is also horizontal.

FIG. 3A is an enlarged view showing an enlarged portion A of FIG. 1A.

As shown in FIG. 3A, the inner peripheral surface 3111 of the receiving frame 3 has an inner peripheral surface 3111 that is inclined at a constant angle in the direction in which the inner diameter of the frame body 31 expands upward and is connected to the upper end surface 312. It is provided. As described above, by adopting the inner peripheral surface 3111 inclined at a constant angle, the manufacturing cost is reduced as compared with the above-mentioned lid receiving frame set of Patent Document 1 using the receiving frame composed of a plurality of surfaces having different inclination angles. It can be suppressed. The inclination angle of the inner peripheral surface 3111 is set to about 5 to 12 degrees. Further, on the lower side of the inner peripheral surface 3111, a stop portion 3112 protruding in a ring shape is provided inside the receiving frame 3. The stop portion 3112 repeatedly applies a load to the manhole cover 2, and when the manhole cover 2 slides down, it comes into contact with the lower end portion of the annular wall portion 22 to cause the manhole cover 2 to slide down. It is to stop.

The outer peripheral portion 221 of the annular wall portion 22 of the manhole cover 2 is provided with an upper contact portion 2211 and a lower contact portion 2212 provided below the upper contact portion 2211. The upper contact portion 2211 and the lower contact portion 2212 are provided at intervals in the height direction, and an intermediate portion 2213 is formed between the upper contact portion 2211 and the lower contact portion 2212.

The upper contact portion 2211 is a tapered surface that is inclined outward as it goes upward and is connected to the front surface 21a, and the inclination angle thereof is set to be substantially the same as that of the inner peripheral surface 3111. As a result, the upper contact portion 2211 comes into surface contact with the inner peripheral surface 3111 in the closed state. As shown by the alternate long and short dash line, the lower end portion of the upper contact portion 2211 may have an R shape.

The intermediate portion 2213 is formed by entering inward from the lower end of the upper contact portion 2211 and hanging downward from there, and the lower contact portion 2212 is formed by the corner portion of the lower end portion of the annular wall portion 22. That is, the outer peripheral portion 221 of the present embodiment is composed of three surfaces. As a result, the processing and the like are simplified as compared with the manhole cover 2 in which the outer peripheral portion 221 is composed of many surfaces.

The lower contact portion 2212 is a portion that linearly contacts the inner peripheral surface 3111 in the circumferential direction of the inner peripheral surface 3111 in the closed state. As shown by the alternate long and short dash line, the lower end portion of the annular wall portion 22 may be R-shaped, and a part of this R-shaped portion may be the lower contact portion 2212.

That is, in the closed state, the upper contact portion 2211 is in surface contact with the inner peripheral surface 3111, while the lower contact portion 2212 is spaced apart from the upper contact portion 2211 in the height direction in the circumferential direction of the inner peripheral surface 3111. In a linear contact with the inner peripheral surface 3111, a space is formed between the upper contact portion 2211 and the lower contact portion 2212. As a result, it is easier to secure a contact area and it is easier to suppress the biting of the manhole cover 2 as compared with the mode in which all the portions in contact with the inner peripheral surface 3111 are in linear contact.

Further, in the manhole cover 2, since the upper contact portion 2211 and the lower contact portion 2212 provided at intervals in the height direction come into contact with the inner peripheral surface 3111, the entire tapered surface of the manhole cover is covered with the inner peripheral surface 3111. It is easier to bring the upper contact portion 2211 and the lower contact portion 2212 into contact with the inner peripheral surface 3111 without a gap, as compared with the conventional aspect of contacting the inner peripheral surface. Further, a space (inner peripheral surface 3111 of the receiving frame 3 and the manhole cover 2) formed between the upper contact portion 2211 and the lower contact portion 2212 for sand or the like that has entered between the receiving frame 3 and the manhole cover 2. It can escape to the space defined by the intermediate portion 2213). As a result, a gap is less likely to occur between the upper contact portion 2211 and the lower contact portion 2212 and the inner peripheral surface 3111, and rattling of the manhole cover 2 can be suppressed.

Further, in the present embodiment, the contact area between the upper contact portion 2211 that comes into surface contact with the inner peripheral surface 3111 and the lower contact portion 2212 that linearly contacts the inner peripheral surface 3111 in the circumferential direction of the inner peripheral surface 3111 There is a big difference. As a result, the stress (vector) generated in the contact portion between the upper contact portion 2211 and the inner peripheral surface 3111 of each of the lower contact portions 2212 is dispersed, and the rattling of the manhole cover 2 can be further suppressed.

Further, the lower end portion of the portion where the lid rib 23 connects to the inner peripheral 222 of the annular wall portion 22 is located above the lower contact portion 2212, and in the present embodiment, it is located above the lower contact portion 2212. The position is close to the upper contact portion 2211. As a result, in the closed state, the portion of the annular wall portion 22 having the lower contact portion 2212 is likely to be elastically deformed, the biting of the manhole cover 2 is further relaxed, and the manhole cover 2 is more easily opened. Hereinafter, the lower end portion of the portion where the lid rib 23 is connected to the inner peripheral 222 of the annular wall portion 22 is referred to as a connection lower end portion, and will be described with reference numerals 23L in the drawings. The lower end portion 23L of the connection may be set at the same height position as the lower end portion of the upper contact portion 2211 or at substantially the same height position as the lid rib 23 ″ indicated by the alternate long and short dash line.

Further, in the present embodiment, the upper end portion of the portion where the frame rib 33 is connected to the outer peripheral surface 313 of the frame main body 31 is above the portion with which the lower contact portion 2212 is in contact in the closed state, and is upper side. The contact portion 2211 is located at the same height as the portion that comes into surface contact. By doing so, the rigidity of the portion of the manhole cover 2 having the lower contact portion 2212 is low, whereas the rigidity of the portion of the frame body 31 with which the lower contact portion 2212 is in contact is high. Become. As a result, in the closed state, the portion of the annular wall portion 22 of the manhole cover 2 having the lower contact portion 2212 is more likely to be elastically deformed. Hereinafter, the upper end portion of the portion where the frame rib 33 is connected to the outer peripheral surface 313 of the frame main body 31 is referred to as a connection upper end portion, and will be described with reference to 33H in the drawings.

That is, in the present embodiment, the upper contact portion 2211 and the inner peripheral surface 3111, and the lower contact portion 2212 and the inner peripheral surface 3111 are pressed against each other by the pressing force due to the elastic deformation of the annular wall portion 22 in the closed state. It becomes an aspect. As a result, even when the manhole cover 2 sinks more into the receiving frame 3, it is possible to reduce the difficulty of opening the manhole cover 2.

Here, like the lid rib 23'shown by the alternate long and short dash line, the position of the connection lower end portion 23L is provided closer to the lower contact portion 2212 than the upper contact portion 2211, and the frame rib 33'shown by the alternate long and short dash line. In addition, the position of the connection upper end portion 33H may be provided below or at the same height as the portion with which the lower contact portion 2212 contacts in the closed state. According to this aspect, the rigidity of the portion of the annular wall portion 22 of the manhole cover 2 having the lower contact portion 2212 is increased, while the portion of the frame body 31 that the lower contact portion 2212 contacts is in the closed state. Rigidity is low. As a result, in the closed state, the portion of the frame body 31 that comes into contact with the lower contact portion 2212 is likely to be elastically deformed, and the manhole cover 2 is easily opened. That is, the upper contact portion 2211 and the inner peripheral surface 3111, and the lower contact portion 2212 and the inner peripheral surface 3111 are pressed against each other by the pressing force due to the elastic deformation of the frame body 31 in the closed state.

FIG. 3B is a diagram showing a modified example of FIG. 3A.

In the following description of the modified example and the subsequent description of the other embodiment, the differences from the lid receiving frame set 10 of the first embodiment shown in FIGS. 1, 2 and 3 (a) will be mainly described. , The components having the same names as the components described so far may be described with the reference numerals used so far, and duplicate description may be omitted.

As shown in FIG. 3B, in this modification, a corner portion is provided in a portion above the lower end of the outer peripheral portion 221 of the annular wall portion 22, and this corner portion is used as a lower contact portion 2212. In this modification, the position of the connection lower end portion 23L is provided below the upper contact portion 2211 as in the lid rib 23'shown by the alternate long and short dash line, and the connection upper end portion is provided as in the frame rib 33'shown by the alternate long and short dash line. The position of 33H may be provided below the portion where the lower contact portion 2212 contacts in the closed state. Also in this aspect, in the closed lid state, the portion of the frame body 31 that the lower contact portion 2212 contacts is likely to be elastically deformed. As shown by the alternate long and short dash line, the lower portion of the outer peripheral portion 221 may be an R shape, and a part of this R-shaped portion may be a lower contact portion 2212.

FIG. 4A is a diagram showing a mode corresponding to FIG. 3A in the lid receiving frame set of the second embodiment.

As shown in FIG. 4A, in the lid receiving frame set 10 of the second embodiment, the upper contact portion 2211 is composed of the upper end corner portion of the outer peripheral portion 221 of the annular wall portion 22, and the lower contact portion 2212 is formed. It is composed of a tapered surface formed on the lower portion of the outer peripheral portion 221 of the annular wall portion 22. In addition, like the upper contact portion 2211'shown by the alternate long and short dash line, a part of the R shape may be brought into contact with the inner peripheral surface 3111 instead of the corner portion.

As a result, in the closed state, the upper contact portion 2211 linearly contacts the inner peripheral surface 3111 in the circumferential direction of the inner peripheral surface 3111, and the lower contact portion 2212 comes into surface contact with the inner peripheral surface 3111. Also in this embodiment, the contact area is large between the upper contact portion 2211 that linearly contacts the inner peripheral surface 3111 in the circumferential direction of the inner peripheral surface 3111 and the lower contact portion 2212 that makes surface contact with the inner peripheral surface 3111. It's different. As a result, the stress (vector) generated in the contact portion between the upper contact portion 2211 and the inner peripheral surface 3111 of each of the lower contact portions 2212 is dispersed, and the rattling of the manhole cover 2 can be suppressed.

Further, in the present embodiment, sand or the like enters from a portion where the inner peripheral surface 3111 and the upper contact portion 2211 are in contact with each other, and the entered sand or the like is a space between the upper contact portion 2211 and the lower contact portion 2212. This makes it possible to further suppress the rattling of the manhole cover 2. Further, also in the present embodiment, the intermediate portion 2213 is composed of two surfaces, and the entire outer peripheral portion 221 is composed of three surfaces. This simplifies the processing process and the like.

Further, in the present embodiment, the position of the connection lower end portion 23L of the lid rib 23 is set to the same height as or substantially the same height as the upper end of the lower contact portion 2212, and the height of the connection upper end portion 33H of the frame rib 33 is set. The vertical position is set between the upper contact portion 2211 and the lower contact portion 2212 in the closed state. As a result, in the closed state, the portion of the annular wall portion 22 of the manhole cover 2 having the lower contact portion 2212 is likely to be elastically deformed.

The position of the connection lower end portion 23L is set to the same height as the lower contact portion 2212 as in the lid rib 23'shown by the alternate long and short dash line, and the connection upper end portion is set as in the frame rib 33'indicated by the alternate long and short dash line. The height position of 33H may be set below the portion where the lower contact portion 2212 in the closed state contacts. By doing so, in the closed state, the portion of the frame body 31 that the lower contact portion 2212 contacts may be easily elastically deformed.

FIG. 4B is a diagram showing a modified example of FIG. 4A.

As shown in FIG. 4B, the upper contact portion 2211 may be configured by a corner portion of the outer peripheral portion 221 of the manhole cover 2 provided at a predetermined dimension below the front surface 21a. As shown by the alternate long and short dash line, the upper portion of the outer peripheral portion 221 may be an R shape, and a part of the R shape portion may be an upper contact portion 2211.

FIG. 5A is a diagram showing a mode corresponding to FIG. 3A in the lid receiving frame set of the third embodiment.

As shown in FIG. 5A, in the lid receiving frame set 10 of the third embodiment, both the upper contact portion 2211 and the lower contact portion 2212 are configured by a tapered surface, and the upper contact portion 2211 also has the lower contact portion 2212. Also employs a mode of surface contact with the inner peripheral surface 3111. Further, the vertical dimension of the upper contact portion 2211 is set to be larger than the vertical dimension of the lower contact portion 2212, and the contact area in contact with the inner peripheral surface 3111 is different. The vertical dimension of the upper contact portion 2211 may be smaller than the vertical dimension of the lower contact portion 2212.

Further, in the present embodiment, the intermediate portion 2213 in the outer peripheral portion 221 of the manhole cover 2 is composed of two bent surfaces. As shown by the alternate long and short dash line, it may be an intermediate portion 2213 ′ composed of a concave portion (groove) having a rectangular cross-sectional view, or as indicated by a two-dot chain line, it may be an intermediate portion 2213 ″ composed of an arcuate surface.

Further, in the present embodiment, the position of the connection lower end portion 23L of the lid rib 23 is set to the same height as or substantially the same height as the bending position in the intermediate portion 2213, and the position of the connection upper end portion 33H of the frame rib 33 is set. Is set at the same height as or substantially the same height as the lower end of the portion in contact with the upper contact portion 2211 in the closed lid state. As a result, in the closed state, the portion of the annular wall portion 22 of the manhole cover 2 having the lower contact portion 2212 is likely to be elastically deformed.

The position of the connection lower end portion 23L is set to the same height as the lower contact portion 2212 as in the lid rib 23'shown by the alternate long and short dash line, and the connection upper end portion is set as in the frame rib 33'indicated by the alternate long and short dash line. The height position of 33H may be set below the lower contact portion 2212 in the closed state. By doing so, in the closed state, the portion of the frame body 31 that the lower contact portion 2212 contacts may be easily elastically deformed.

FIG. 5B is a diagram showing a modified example of FIG. 5A.

As shown in FIG. 5B, in the modified example of the third embodiment, the upper contact portion 2211 is provided on the outer peripheral portion 221 of the manhole cover 2 by a predetermined dimension below the front surface 21a, and the lower contact portion is contacted. The portion 2212 is provided above the lower end portion of the outer peripheral portion 221 of the manhole cover 2 by a predetermined dimension.

In this modification, the position of the connection lower end portion 23L is set below the lower contact portion 2212 like the lid rib 23'shown by the alternate long and short dash line, and the frame rib 33'shown by the alternate long and short dash line. The height position of the connection upper end portion 33H may be set below the portion with which the lower contact portion 2212 in the closed state contacts.

According to the lid receiving frame set 10 described above, it is possible to suppress the manufacturing cost of the receiving frame 3 and to suppress the rattling of the manhole cover 2 and the excessive biting of the manhole cover 2 in a well-balanced manner.

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 embodiment in which the two contact portions of the upper contact portion 2211 and the lower contact portion 2212 are brought into contact with the inner peripheral surface 3111 has been described as an example, but the upper contact portion 2211 and the lower contact portion 2212 have been described. It is also possible to provide a contact portion other than the above and bring three or more contact portions into contact with the inner peripheral surface 3111. Further, in the above embodiment, the annular wall portion 22 is formed by raising the height position of the connection lower end portion 23L of the lid rib 23, that is, lowering the height of the portion of the lid rib 23 connected to the inner peripheral 222. Although it was made easy to elastically deform, as shown in the enlarged circle surrounded by the alternate long and short dash line in FIG. 2A, the thickness of the portion of the lid rib 23 connected to the inner circumference 222 was reduced to reduce the thickness of the annular wall. The portion 22 may be easily elastically deformed.

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 first underground structure lid receiving frame set described so far is underground provided with a receiving frame defining an opening connected to the underground structure and a lid body supported by the receiving frame to close the opening. In the lid receiving frame set for structures
The receiving frame has a cylindrical frame body, a lower flange portion protruding outward from the lower end portion of the frame body, and a frame rib provided on the upper surface of the lower flange portion and connected to the outer periphery of the frame body. Have
The frame body has an inner peripheral surface that is provided on the inner circumference of the frame body and is inclined at a constant angle in a direction in which the inner diameter of the frame body expands upward.
The lid has a top plate portion and an annular wall portion surrounding the top plate portion.
The annular wall portion has an upper contact portion and a lower contact portion provided at intervals in the height direction on the outer periphery thereof.
One of the upper contact portion and the lower contact portion is in surface contact with the inner peripheral surface in the closed state.
The other of the upper contact portion and the lower contact portion is in surface contact with the inner peripheral surface in the closed state, or linearly contacts the inner peripheral surface in the circumferential direction of the inner peripheral surface. To do
The frame rib is characterized in that the upper end of a portion connected to the frame body is located below the portion with which the lower contact portion contacts in the closed state.

Further, the second underground structure lid receiving frame set described so far is underground provided with a receiving frame defining an opening connected to the underground structure and a lid body supported by the receiving frame to close the opening. In the lid receiving frame set for structures
The receiving frame has a cylindrical frame body, a lower flange portion protruding outward from the lower end portion of the frame body, and a frame rib provided on the upper surface of the lower flange portion and connected to the outer periphery of the frame body. Have
The frame body has an inner peripheral surface that is provided on the inner circumference of the frame body and is inclined at a constant angle in a direction in which the inner diameter of the frame body expands upward.
The lid has a top plate portion, an annular wall portion surrounding the top plate portion, and a lid rib provided on the back surface of the top plate portion and connected to the inner circumference of the annular wall portion.
The annular wall portion has an upper contact portion and a lower contact portion provided at intervals in the height direction on the outer periphery thereof.
One of the upper contact portion and the lower contact portion is in surface contact with the inner peripheral surface in the closed state.
The other of the upper contact portion and the lower contact portion is in surface contact with the inner peripheral surface in the closed state, or linearly contacts the inner peripheral surface in the circumferential direction of the inner peripheral surface. To do
The upper contact portion and the inner peripheral surface, and the lower contact portion and the inner peripheral surface are pressed against each other by elastic deformation of either the frame body or the annular wall portion in the closed state. Being done
In the lid rib, the lower end of the portion connected to the annular wall portion is located below the upper end of the lower contact portion.
The frame rib is characterized in that the upper end of a portion connected to the frame body is located below the portion with which the lower contact portion contacts in the closed state.

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 has a cylindrical frame body, and has a cylindrical frame body.
The frame body has an inner peripheral surface that is provided on the inner circumference of the frame body and is inclined at a constant angle in a direction in which the inner diameter of the frame body expands upward.
The lid has a top plate portion and an annular wall portion surrounding the top plate portion.
The annular wall portion has an upper contact portion and a lower contact portion provided at intervals in the height direction on the outer periphery thereof.
One of the upper contact portion and the lower contact portion is in surface contact with the inner peripheral surface in the closed state.
The other of the upper contact portion and the lower contact portion is in surface contact with the inner peripheral surface in the closed state, or linearly contacts the inner peripheral surface in the circumferential direction of the inner peripheral surface. It may be a lid receiving frame set for an underground structure, which is characterized in that it is to be used.

Here, the upper contact portion and the lower contact portion may be provided on the entire circumference of the outer circumference of the annular wall portion, or may be provided on a part of the outer circumference. good. For example, the upper contact portion and the lower contact portion may be provided at predetermined intervals in the circumferential direction on the outer periphery of the annular wall portion. Further, apart from the upper contact portion and the lower contact portion, there is a contact portion that makes surface contact with the inner peripheral surface, or a contact portion that linearly contacts the inner peripheral surface in the circumferential direction of the inner peripheral surface. You may be doing it. That is, in the closed state, the number of portions of the lid that come into contact with the inner peripheral surface may be three or more.

According to this underground structure lid receiving frame set, at least one of the upper contact portion and the lower contact portion is in surface contact with the inner peripheral surface, so that all the portions in contact with the inner peripheral surface are in contact with the inner peripheral surface. However, it is easier to secure a contact area and it is easier to suppress excessive biting of the lid as compared with a mode in which the inner peripheral surface is linearly contacted.

Further, in the lid body, the upper contact portion and the lower contact portion provided at intervals in the height direction come into contact with the inner peripheral surface. Therefore, as compared with the above-described embodiment in which the entire tapered surface of the lid is brought into contact with the inner peripheral surface, it is easier to bring the upper contact portion and the lower contact portion into contact with the inner peripheral surface without a gap. Further, sand or the like that has entered between the receiving frame and the lid can be released to the space formed between the upper contact portion and the lower contact portion. As a result, in the closed state, a gap is less likely to occur between the upper contact portion and the lower contact portion and the inner peripheral surface, and rattling of the lid can be suppressed. In particular, in the case where the upper contact portion linearly contacts the inner peripheral surface in the circumferential direction of the inner peripheral surface and the lower contact portion makes surface contact with the inner peripheral surface, the upper contact portion is formed. Sand or the like enters from between the portion and the inner peripheral surface and easily clogs the space formed between the upper contact portion and the lower contact portion, and the rattling of the lid can be further suppressed.

Further, since the receiving frame has the inner peripheral surface inclined at a certain angle, the manufacturing cost of the receiving frame can be suppressed, and the receiving frame generally used in the past can be adopted. can.

Further, in this underground structure lid receiving frame set, the upper contact portion and the lower contact portion may have different contact areas with the inner peripheral surface in the closed state.

By making the contact area with the inner peripheral surface different between the upper contact portion and the lower contact portion, stress (vector) generated in the contact portion between the lid body and the receiving frame is scattered, and the lid body is scattered. The rattling of the can be further suppressed.

Here, in the case where the upper contact portion and the lower contact portion both make surface contact with the inner peripheral surface in the closed state, the height direction of the upper contact portion and the lower contact portion. The dimensions of may be different.

Further, in this underground structure lid receiving frame set, the lid body is provided on the back surface of the top plate portion and has a lid rib connected to the inner circumference of the annular wall portion.
The lid rib may have a lower end of a portion connected to the annular wall portion located above the lower contact portion.

By doing so, in the closed state, the portion of the annular wall portion having the lower contact portion is likely to be elastically deformed. Therefore, the biting of the lid body is alleviated, and the lid body can be easily opened.

Further, in this underground structure lid receiving frame set, the receiving frame is provided on the lower flange portion protruding outward from the lower end portion of the frame body and the upper surface of the lower flange portion, and is connected to the outer periphery of the frame body. It has a frame rib to be used.
The frame rib may have an upper end of a portion connected to the frame body located below the portion with which the lower contact portion contacts in the closed state.

By doing so, in the closed state, the portion of the frame body in which the upper contact portion and the lower contact portion come into contact with each other is likely to be elastically deformed. Therefore, the biting of the lid body is alleviated, and the lid body can be easily opened.

Further, in this underground structure lid receiving frame set, the upper contact portion and the inner peripheral surface, and the lower contact portion and the inner peripheral surface are the frame main body and the annular wall portion in the closed state. They may be pressed against each other by the pressing force due to the elastic deformation of either one.

For example, when either the frame main body or the annular wall portion is elastically deformed by making the rigidity of the frame main body and the annular wall portion different from each other, so that the sinking of the lid body into the receiving frame becomes large. However, it is possible to reduce the difficulty of opening the lid. In the case of the mode in which the frame body and the annular wall portion are plastically deformed in the closed state, the frame body is opened once from the closed state and then closed again. Or the annular wall portion does not match the plastically deformed portion, and there is a possibility that the lid body may rattle.

Further, in this underground structure lid receiving frame set, the lid body is provided on the back surface of the top plate portion and has a lid rib connected to the inner circumference of the annular wall portion.
The receiving frame has a lower flange portion protruding outward from the lower end portion of the frame body, and a frame rib provided on the upper surface of the lower flange portion and connected to the outer periphery of the frame body.
The lid rib has a lower end of a portion connected to the annular wall portion located above the lower contact portion.
The frame rib may have an upper end of a portion connected to the frame body located above the portion with which the lower contact portion contacts in the closed state.

By doing so, the rigidity of the portion having the lower contact portion in the annular wall portion of the lid body becomes low, and in the closed state, the portion of the frame body that the lower contact portion contacts. Increases rigidity. As a result, the portion of the annular wall portion of the lid body having the lower contact portion is likely to be elastically deformed, and the lid body is easily opened.

Further, in this underground structure lid receiving frame set, the lid body is provided on the back surface of the top plate portion and has a lid rib connected to the inner circumference of the annular wall portion.
The receiving frame has a lower flange portion protruding outward from the lower end portion of the frame body, and a frame rib provided on the upper surface of the lower flange portion and connected to the outer periphery of the frame body.
In the lid rib, the lower end of the portion connected to the annular wall portion is located below the upper end of the lower contact portion.
The frame rib may have an upper end of a portion connected to the frame body located below the portion with which the lower contact portion contacts in the closed state.

By doing so, the rigidity of the portion of the annular wall portion of the lid body having the lower contact portion is increased, and in the closed state, the portion of the frame body that the lower contact portion contacts. The rigidity is low. Therefore, the portion of the frame body that comes into contact with the lower contact portion is likely to be elastically deformed, and the lid is easily opened.

10 Closure receiving frame set 2 Manhole cover 21 Top plate part 22 Circular wall part 2211 Upper contact part 2212 Lower contact part 23 Lid rib 23L Connection lower end 3 Receiving frame 31 Frame body 3111 Inner peripheral surface 32 Lower flange part 33 Frame rib 33H connection Upper end H opening

Claims (3)

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 has a cylindrical frame body, and has a cylindrical frame body.
The frame body has an inner peripheral surface that is provided on the inner circumference of the frame body and is inclined at a constant angle in a direction in which the inner diameter of the frame body expands upward.
The lid has a top plate portion, an annular wall portion surrounding the top plate portion, and a lid rib provided on the back surface of the top plate portion and connected to the inner circumference of the annular wall portion.
The annular wall portion has an upper contact portion and a lower contact portion provided at intervals in the height direction on the outer periphery thereof.
One of the upper contact portion and the lower contact portion is in surface contact with the inner peripheral surface in the closed state.
The other of the upper contact portion and the lower contact portion is in surface contact with the inner peripheral surface in the closed state, or linearly contacts the inner peripheral surface in the circumferential direction of the inner peripheral surface. To do
The lid rib is a lid receiving frame set for an underground structure, wherein the lower end of a portion connected to the annular wall portion is located above the lower contact portion. The lid receiving frame set for an underground structure according to claim 1, wherein the lower end of the portion connected to the annular wall portion of the lid rib is located below the upper contact portion. The lid receiving frame set for an underground structure according to claim 1 or 2, wherein the upper contact portion is in surface contact with the inner peripheral surface in the closed state.

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