JP5152987B2 - Cover for underground structure - Google Patents

Description

  The present invention relates to a lid for an underground structure including a lid body and a receiving frame that supports the lid body so as to be opened and closed.

  In addition, the term “underground structure lid” as used in the present specification means a manhole cover, a large iron cover, a sewage culm lid, an electric power / Openable and closable joint gutter lids, power transmission iron lids, power distribution iron lids, buried underground pipes in waterworks and gas pipes, and their associated equipment to protect underground facilities equipment and underground cables in communications A fire hydrant lid, a water control valve lid, a gate valve lid, an air valve lid, a gas pipe lid, a water meter lid, etc., that function as an open / close door.

  Conventionally, lids for underground structures have been filled with colored resin, such as epoxy resin, in the recesses of the lid body made of cast iron, improving the landscape on the road as a colorful design, or being buried underground The convenience and visibility of maintenance are improved by displaying the facilities and devices that have been used.

As such a lid for underground structures, there is a color iron lid for underground structures described in Patent Document 1. In this case, a pattern is formed on the surface of the iron lid main body with convex portions and concave portions, and the concave portions are filled with a colored resin.
JP 2005-299154 A

  However, when the colored resin is filled in the concave portion of the lid body made of cast iron in this way, a gap may be generated between the lid body and the colored resin from the beginning due to shrinkage when the colored resin is solidified, and there is no gap. Even in such a case, there is a problem that, when the internal stress remains, peeling occurs due to repeated load due to passing of the vehicle or the like, and the scenery and visibility are deteriorated.

  Moreover, since it is necessary to replace the lid body itself in order to improve the landscape and visibility again, there is a problem that the cost burden on the maintenance manager also increases.

  The present invention has been made in view of the above-mentioned problems, and the problem is that the landscape structure and visibility can be improved and the landscape structure and visibility can be maintained over a long period of time. The object is to provide an object lid.

The present invention provides a lid for an underground structure including a round lid body and a receiving frame that supports the lid body so that the lid body can be opened and closed. The lid body has an edge around the periphery, and is surrounded by the edge. A cast iron frame having a recessed portion as a recessed portion, and a resin base plate that can be attached to the recessed portion of the frame, and the base plate is detachably fixed by being fitted into the recessed portion of the frame , A curved protrusion having a diameter slightly larger than the inner diameter of the edge of the frame is formed on the entire outer periphery of the base plate .

In the present invention, scenery and visibility can be improved by putting a design and display on a resin base plate. And by fitting this resin base plate into the recess of the cast iron frame and integrating it, the frame and the base plate can be integrated without gaps, and there is no excessive internal stress remaining. The base plate does not easily come off even when a repeated load is applied due to passage or the like. Therefore, the landscape and visibility of the base plate can be maintained for a long time. Furthermore, when changing the design or display, it is economical because only the base plate can be removed and replaced. In addition, since the base plate that occupies most of the lid body is made of resin, the weight can be reduced. Further, a curved projection having a diameter slightly larger than the inner diameter of the edge of the frame is formed on the entire upper side of the outer periphery of the base plate. With this configuration, the protrusions on the outer periphery of the base plate reliably come into contact with the inner peripheral surface of the edge of the frame, so rainwater and earth and sand can be more reliably prevented from entering between the frame and the base plate. can do. Therefore, the performance can be maintained even when an electronic component such as an IC tag is attached to the base plate. Further, deterioration of the cast iron frame itself can be prevented. Furthermore, even if there is a dimensional error between the resin base plate and the cast iron frame, the protrusions of the base plate abut against the inner peripheral surface of the edge of the frame, so that they can be securely fitted and integrated. be able to.

In the present invention, an information transmission medium such as an IC tag can be attached to the base plate. Thereby, in addition to the improvement in landscape and visibility, the convenience of maintenance work can be improved, and the base plate can be utilized for multiple functions. Further, in the recess formed on the back surface of the base plate, the IC tag is disposed in a state of being placed on the upper surface of a fixing member made of a nonmagnetic material such as a resin fitted on the bottom surface side of the recess, Disturbance of electromagnetic waves can be prevented.

Furthermore, in the present invention, various information display plates for displaying information such as the types of valve plugs, the diameter, the type of fluid, the flow direction, and the management number can be attached to the surface of the base plate as an information transmission medium. . Thereby, in addition to the improvement in landscape and visibility, the convenience of maintenance work can be improved, and the base plate can be utilized for multiple functions.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to improve the landscape property and visibility of the lid | cover for underground structures, the landscape property and visibility can be maintained over a long term.

  Embodiments of the present invention will be described below based on examples shown in the drawings.

  1A and 1B show an embodiment of a lid for an underground structure according to the present invention, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA in FIG.

  The underground structure lid 100 shown in FIG. 1 is a gate valve lid, and includes a lid body 200 and a receiving frame 400 that supports the lid body 200 via a hinge mechanism 300 so as to be opened and closed.

FIG. 2 is an exploded perspective view showing the configuration of the lid body 200. The lid body 200 has an edge 211 around it, and a frame 210 made of cast iron formed in a substantially tray shape with a portion surrounded by the edge 211 as a recess 212, and attached to the recess 212 of the frame 210. A base plate 220 made of resin, and the base plate 220 is fitted in the recess 212 of the frame 210 and is detachably fixed.

  The base plate 220 is made of a thermoplastic resin such as polycarbonate having wear resistance, impact resistance and compressive strength, and is formed by injection molding or the like, and a plurality of convex portions 221 are provided on the surface thereof as slip prevention and design. It has been. Various information display plates 230 for displaying information such as the types of valve plugs, the diameter, the type of fluid, the flow direction, and the management number are attached to the surface of the base plate 220 as an information transmission medium. Further, an IC tag 240 capable of wirelessly reading and writing position information, maintenance information, and the like is attached to the back surface of the base plate 220 as an information transmission medium.

  Specifically, the IC tag 240 is inserted into a recess 222 formed by a circular rib on the back surface of the base plate 220 shown in FIG. 3, and a fixing member 250 made of an elastic resin foam shown in FIG. By fitting, as shown in FIG. 4, it is placed at a predetermined height position in the recess 222 while being placed on the upper surface of the fixing member 250. Then, an IC tag position display mark 223 shown in FIG. 2 is provided on the surface of the base plate 220 at a position corresponding to the mounting position of the IC tag 240 so that the mounting position of the IC tag 240 can be seen from the surface side of the base plate 220. ing.

  In the embodiment, an electromagnetic induction passive tag having a communication distance of several tens of cm and a communication frequency of 13.56 MHz was used as the IC tag 240. In this case, the material of the fixing member 250 is preferably a nonmagnetic material such as a resin from the viewpoint of preventing disturbance of electromagnetic waves.

  FIG. 5 is an enlarged cross-sectional view of the main part of the lid main body 200 taken along the line B-B in FIG. As shown in the figure, on the outer periphery of the base plate 220, a quadrant circular projection 224 having a diameter slightly larger than the inner diameter of the edge 211 of the frame 210 is formed over the entire circumference. The base plate 220 is securely fitted to and integrated with the frame 210 by reliably contacting the inner peripheral surface of the edge 211 of the frame 210. Further, in order to more surely integrate the base plate 220 and the frame 210, a tapping screw 260 is attached from the back side of the frame 210 to fasten the base plate 220 and the frame 210. If the tapping screw 260 is removed, the base plate 220 can be removed from the frame 210, and only the base plate 220 can be replaced.

  Here, the vertical cross-sectional shape of the protrusion 224 is a curved surface such as a quadrant or semicircle so that when the base plate 220 is pushed in, the base plate 220 is smoothly fitted while being in contact with the inner peripheral surface of the edge 211. It is preferable to make it into a shape. In addition, the position where the protrusion 224 is provided is preferably the upper side of the outer peripheral surface of the base plate 220 in order to prevent the inflow of rainwater and earth and sand.

  As described above, in the present invention, the frame 210 and the base plate 220 can be integrated with no gap by fitting the resin base plate 220 into the recess 212 of the cast iron frame 210 and integrating them. Therefore, the landscape and visibility of the base plate 220 can be maintained for a long time.

  In the embodiment, the present invention is applied to the gate valve cover, but it can also be applied to other underground structure covers such as a manhole cover and a fire hydrant cover.

One Example of the lid | cover for underground structures of this invention is shown, (a) is a top view, (b) is AA sectional drawing of (a). It is a disassembled perspective view which shows the structure of the cover main body of the cover for underground structures shown in FIG. It is a reverse view of the baseplate which comprises the cover main body of the cover for underground structures shown in FIG. It is sectional drawing of the principal part which shows the mounting state of an IC tag. It is an expanded sectional view of the principal part of the lid body by the BB section of Drawing 1 (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Cover for underground structures 200 Cover body 210 Frame 211 Edge 212 Depressed part 220 Base plate 221 Convex part 222 Concave part 223 IC tag position display mark 224 Protrusion part 230 Information display plate 240 IC tag 250 Fixing member 260 Tapping screw 300 Hinge mechanism 400 Slot

Claims (3)

In a lid for an underground structure including a round lid body and a receiving frame that supports the lid body so as to be openable and closable,
The lid body has an edge around the periphery, and includes a cast iron frame having a recess surrounded by the edge, and a resin base plate that can be attached to the recess of the frame,
The base plate is detachably fixed by being fitted into the recess of the frame ,
A lid for an underground structure , wherein a curved protrusion having a diameter slightly larger than the inner diameter of the edge of the frame is formed on the upper side of the outer periphery of the base plate over the entire circumference . The IC tag is disposed in a recess formed on the back surface of the base plate in a state where the IC tag is mounted on the upper surface of a fixing member made of a nonmagnetic material such as a resin fitted on the bottom surface side of the recess. Item 2. An underground structure lid according to Item 1. The surface of the base plate is provided with various information display plates for displaying information such as the types of valve plugs, the diameter, the type of fluid, the flow direction, and the management number as an information transmission medium. The lid for underground structures according to claim 1 or claim 2.

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