JP4218878B2 - Receiving frame for lid for underground structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a receiving frame for a lid for an underground structure.
As used herein, the term “underground structure lid” refers to a large iron lid, a manhole lid, a sewage jar lid for closing an opening through an underground structure, underground structure facility, etc. in a sewer system. , Openable and closable joint groove iron covers, power transmission iron covers, wiring iron covers, underground conduits in waterworks and gas pipes and their associated equipment and ground Fire hydrant lids, water control valve lids, gate valve lids, air valve lids, gas piping lids, water meter lids, etc. that function as open / close doors that connect
[0002]
[Prior art]
The upper part of the underground structure such as a buried case or manhole embedded in the basement is composed of a lid main body and a receiving frame that supports the cover in order to close the opening through the ground and the interior of the underground structure so as to be openable and closable. A cover for underground structures is provided.
Here, in the conventional receiving frame structure, in order to increase physical strength, reinforcing ribs are generally provided on the outer peripheral side surface (see, for example, Patent Document 1). By providing reinforcing ribs on the outer peripheral side surface of the receiving frame in this way, the strength of the receiving frame can be maintained, and deformation of the receiving frame due to a load received during construction or the like can be prevented.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 8-13525
[Problems to be solved by the invention]
Conventionally, when installing a receiving frame for a lid for an underground structure on a road or the like, a level adjusting device for the receiving frame is interposed between the upper part of the underground structure and the lower surface of the receiving frame so that the upper end surface of the receiving frame and the ground surface are After installing the level adjustment part of the receiving frame, the surroundings of the receiving frame will be paved with asphalt etc., but in the conventional receiving frame of the lid for underground structures described above, the reinforcement formed on the outer periphery of the receiving frame There was a drawback that the presence of the ribs became an obstacle in the asphalt rolling operation.
Further, since the asphalt rolling pressure is insufficient, there is a problem that the asphalt rigidity is insufficient and the asphalt around the receiving frame is depressed or peeled off due to secular change.
[0005]
The present invention has been made in view of the above points, and an object of the present invention is to provide a receiving frame for a lid for an underground structure that can easily and sufficiently perform paving work around the receiving frame and has sufficient rigidity. .
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 includes a cylindrical portion that supports the lid body, and a flange that extends radially on the outer periphery of the cylindrical portion, and the flange includes a circumferential direction. A plurality of convex portions are formed over the entire circumference at intervals, and the convex portions are formed over the entire radial width of the flange, and an elongated bolt hole extending in the circumferential direction on the upper surface of the convex portion. The lower surface of the convex portion and the lower surface of the convex portion located on both sides are substantially the same as the lower surface of the convex portion on the radially inner side of the bottom plate of the flange. It is characterized by being connected by planes formed at the same height . Due to the above configuration, when installing the receiving frame on a road or the like, the reinforcing ribs do not protrude from the outer periphery of the cylindrical portion, so that the rolling operation such as asphalt is easy and the rolling operation is sufficiently performed. Can do. Further, since the asphalt around the cylindrical portion is not partitioned due to the presence of the reinforcing ribs, the surrounding asphalt does not sink or peel off due to secular change. Furthermore, a plurality of convex portions are formed over the entire circumference at intervals in the circumferential direction of the flange of the receiving frame, and the convex portions are formed over the entire radial width of the flange, whereby the rigidity of the receiving frame can be increased. Accordingly, the flange of the receiving frame can be formed thin, and the weight of the receiving frame can be reduced. In addition, if a long bolt hole extending in the circumferential direction is formed on the upper surface of the convex portion of the flange, and a bulk adjustment piece is placed on the lower side, level adjustment below the height of the bulk adjustment piece itself can be handled. it can.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, an inner peripheral fitting surface for fitting and supporting the lid main body is formed by branching downward from the inner peripheral portion of the cylindrical portion, and the lower portion of the cylindrical portion is positioned below the upper peripheral portion. It is preferable to bulge in the radial direction. With such a configuration, physical strength can be increased without providing reinforcing ribs on the outer periphery of the cylindrical portion.
[0008]
In the present invention, it is preferable that the convex portion has a rectangular wave shape. By setting it as such a structure, the cross-sectional secondary moment of a flange part can be increased and the bending rigidity of a receiving frame can be improved. Moreover, the flange of a receiving frame can be formed thinly in connection with this, and the weight reduction of a receiving frame can be achieved.
[0009]
In this invention, the said convex part can also be made into the shape of a convex curve. By setting it as such a structure, the cross-sectional secondary moment of a flange part can be increased and the bending rigidity of a receiving frame can be improved. Moreover, the flange of a receiving frame can be formed thinly in connection with this, and the weight reduction of a receiving frame can be achieved.
[0010]
In the present invention, the convex portion may be a triangular shape convex upward. By setting it as such a structure, the cross-sectional secondary moment of a flange part can be increased and the bending rigidity of a receiving frame can be improved. Moreover, the flange of a receiving frame can be formed thinly in connection with this, and the weight reduction of a receiving frame can be achieved.
[0011]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a plan view showing a receiving frame of a cover for an underground structure according to the present invention, FIG. 2 is a front view of the receiving frame in FIG. 1, and FIG. 3 is a bottom view of the receiving frame in FIG.
[0012]
The receiving frame 10 according to the present invention includes a cylindrical portion 11 that fits and supports a lid body (not shown) by its inner peripheral fitting surface 11a, and a flange 12 that extends radially on the outer periphery of the cylindrical portion 11, As shown in FIGS. 1 to 5, a plurality of convex portions 13 are formed over the entire circumference of the flange 12 at intervals in the circumferential direction, and the convex portions 13 are formed over the entire radial width of the flange 12. As shown in FIGS. 1 and 4, a handgrip 16 a serving as a grip when an operator enters and exits an underground structure and a hinge attached to a lid main body (not shown) are inserted into the inner surface of the receiving frame 10. The hinge part 16b is integrally provided with the shelf part 16, and the cover body is attached to the receiving frame 10 by inserting and holding the hinge attached to the cover body through the hinge seat 16b provided on the receiving frame 10. On the other hand, it can be opened and closed.
[0013]
Here, the convex portion 13 formed on the receiving frame 10 is formed in a rectangular wave shape, and the upper surface of the convex portion 13 is formed substantially parallel to the bottom plate 12 a of the flange 12. Moreover, the convex part 13 is formed over the radial direction full width from the outer periphery of the cylindrical part 11, and the lower side of the convex part 13 is open | released as space. Furthermore, a bolt hole 14 for inserting an anchor bolt is formed on the upper surface of the convex portion 13. The bolt hole 14 is a long hole extending in the circumferential direction of the cylindrical portion 11.
[0014]
Further, the bending rigidity of the receiving frame according to the present invention was examined by three-dimensional simulation of structural analysis by FEM. As a result, it was confirmed that when the rectangular-wave-like convex portion was provided on the flange 12 over the entire width in the radial direction, the bending rigidity was improved as compared with the case of the flange formed on a flat surface over the entire circumference.
[0015]
As shown in FIGS. 7 and 8, the cylindrical portion 11 bulges in the radial direction around the entire periphery below the upper edge portion, and is configured integrally with the flange 12. With this configuration, the physical strength of the receiving frame can be maintained, and the reinforcing rib does not exist on the outer periphery of the cylindrical portion, so that the asphalt rolling operation around the receiving frame is facilitated.
[0016]
Next, the case where the receiving frame 10 comprised as mentioned above is installed is demonstrated. The receiving frame 10 is fixed to the upper part of the underground structure through level adjusting means (not shown). That is, a bulk adjusting piece (upper spherical nut) is screwed into an anchor bolt standing at an appropriate interval above the underground structure, and the anchor bolt is inserted into a bolt hole 14 formed on the upper surface of the convex portion 13 of the flange 12. And the convex portion 13 is placed on the bulk adjusting piece. Then, by adjusting the level of the bulk adjusting piece, the upper end surface of the receiving frame 10 and the ground surface are made to coincide with each other, and in this state, a fixing nut is tied from above the convex portion 13 to fix the receiving frame 10. At this time, since the bulk adjusting piece is housed in a space formed below the convex portion 13, the distance between the lower surface of the receiving frame 10 and the upper end surface of the underground structure is high. Even if it is less than this, the level can be adjusted. Thereafter, in a state where the upper end surface of the receiving frame 10 and the ground surface are aligned, asphalt or the like is laid around the receiving frame 10 to perform a rolling operation. At this time, in the receiving frame 10, since there is no reinforcing rib on the outer periphery of the cylindrical portion 11, the rolling operation is easy and the rolling operation can be performed sufficiently. Moreover, in the receiving frame 10, since the surrounding asphalt is not divided by the reinforcing rib, the asphalt around the receiving frame 10 does not sink or peel off due to secular change.
[0017]
FIG. 9 is a longitudinal sectional view of an essential part of the flange 12 showing a second embodiment of the receiving frame according to the present invention. In the present embodiment, the convex portion 20 of the flange 12 is formed in a convex curve shape. The curve can be formed with various curvatures. Even in such a configuration, the moment of inertia of the cross section increases and the bending rigidity of the receiving frame can be increased. Therefore, the weight of the product can be reduced by forming the flange of the receiving frame thin.
[0018]
FIG. 10 is a longitudinal sectional view of an essential part of the flange 12 showing a third embodiment of the receiving frame according to the present invention. In the present embodiment, the convex portion 30 of the flange 12 is formed in an upwardly convex triangular shape. Even in such a configuration, the moment of inertia of the cross section increases and the bending rigidity of the receiving frame can be increased. Therefore, the weight of the product can be reduced by forming the flange of the receiving frame thin.
[0019]
【The invention's effect】
Since this invention consists of an above-described structure, there can exist an effect which is demonstrated below.
[0020]
In the first aspect of the present invention, a cylindrical portion that supports the lid main body and a flange that extends radially on the outer periphery of the cylindrical portion are provided, and the flange has a plurality of protrusions spaced in the circumferential direction. The convex portion is formed over the entire radial width of the flange, and an elongated bolt hole extending in the circumferential direction is formed on the upper surface of the convex portion. The lower surface and the lower surface of the convex portion located on both sides are formed at the same height as the lower surface of the convex portion on the radially inner peripheral side of the bottom plate of the flange. Because it is connected by the surface, when installing the receiving frame on the road etc., the ribs for reinforcement do not protrude on the outer periphery of the cylindrical part, it is easy to perform the rolling work such as asphalt, and the rolling work is enough It can be carried out. Further, since there is no reinforcing rib on the outer periphery of the cylindrical portion, the surrounding asphalt is not partitioned by the reinforcing rib, and the surrounding asphalt does not sink or peel off due to secular change. Furthermore, a plurality of convex portions are formed over the entire circumference at intervals in the circumferential direction of the flange of the receiving frame, and the convex portions are formed over the entire radial width of the flange, whereby the rigidity of the receiving frame can be increased. Accordingly, the flange of the receiving frame can be formed thin, and the weight of the receiving frame can be reduced. In addition, if a long bolt hole extending in the circumferential direction is formed on the upper surface of the convex portion of the flange, and a bulk adjustment piece is placed on the lower side, level adjustment below the height of the bulk adjustment piece itself can be handled. it can.
[0021]
Further, in the invention according to claim 2, an inner periphery fitting surface for fitting and supporting the lid body is formed by branching downward from the inner peripheral portion of the upper edge of the cylindrical portion, Since the lower portion of the upper edge portion is expanded in the radial direction, the physical strength can be increased without providing reinforcing ribs on the outer periphery of the cylindrical portion.
[0022]
In the invention according to claim 3 , since the convex portion formed on the flange has a rectangular wave shape, the second moment of the section of the flange portion can be increased and the bending rigidity of the receiving frame can be increased. Moreover, the flange of a receiving frame can be formed thinly in connection with this, and the weight reduction of a receiving frame can be achieved.
[0023]
In the invention according to claim 4 , since the convex portion formed on the flange is formed in a convex curve shape upward, the sectional moment of the flange portion can be increased and the bending rigidity of the receiving frame can be increased. Moreover, the flange of a receiving frame can be formed thinly in connection with this, and the weight reduction of a receiving frame can be achieved.
[0024]
Further, in the invention according to claim 5 , since the convex portion formed on the flange has a triangular shape protruding upward, the second moment of the section of the flange portion can be increased, and the bending rigidity of the receiving frame can be increased. Moreover, the flange of a receiving frame can be formed thinly in connection with this, and the weight reduction of a receiving frame can be achieved.
[Brief description of the drawings]
FIG. 1 is a plan view showing a receiving frame of a cover for an underground structure according to the present invention.
FIG. 2 is a front view of the receiving frame shown in FIG.
FIG. 3 is a bottom view of the receiving frame shown in FIG. 1;
FIG. 4 is a perspective view of the receiving frame shown in FIG. 1 as viewed from above.
FIG. 5 is a perspective view of the receiving frame shown in FIG. 1 as seen from below.
FIG. 6 is a cross-sectional view of the receiving frame in FIG. 1 taken along line AA.
7 is a cross-sectional view of the receiving frame in FIG. 1 taken along line BB.
8 is a cross-sectional view of the receiving frame in FIG. 1 taken along the line GG.
FIG. 9 is a longitudinal sectional view of an essential part of a flange showing a second embodiment of a receiving frame according to the present invention.
FIG. 10 is a longitudinal sectional view of an essential part of a flange showing a third embodiment of a receiving frame according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Base frame lid 11 Tubular part 12 Flange 13 Convex part 14 Bolt hole 15 Reinforcing rib 16 Shelf part 16a Hand grip 20 Convex part 30 Convex part

Claims (5)

A cylindrical portion that supports the lid body;
A flange extending in the radial direction on the outer periphery of the tubular portion;
The flange is formed with a plurality of convex portions over the entire circumference at intervals in the circumferential direction,
The convex portion is formed over the entire radial width of the flange,
A long bolt hole extending in the circumferential direction is formed on the upper surface of the convex portion,
The lower surface of the convex portion and the lower surface of the convex portion located on both sides are substantially the same height as the lower surface of the convex portion on the radially inner peripheral side of the bottom plate of the flange. A receiving frame for a lid for an underground structure, characterized in that it is connected by a surface formed on the surface . An inner peripheral fitting surface that diverges downward from the inner peripheral portion of the cylindrical portion and forms and supports the lid body is formed, and the lower portion of the cylindrical portion bulges in the radial direction from the upper peripheral portion. The receiving frame for the lid for an underground structure according to claim 1 . The receiving frame of the cover for underground structures of Claim 1 or Claim 2 which made the said convex part rectangular wave shape. The receiving frame of the cover for underground structures of Claim 1 or Claim 2 which made the said convex part the convex shape of a convex upward. The receiving frame of the cover for underground structures of Claim 1 or Claim 2 which made the said convex part the triangular shape convex upwards.

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