JP3962839B2 - Round lid for underground structures - Google Patents

Description

  The present invention relates to a round lid for an underground structure including a round lid body and a receiving frame that supports the lid body at an upper portion of an inner peripheral surface.

  In addition, the “round lid for underground structures” as used in the specification of the present application refers to a manhole lid, a large iron lid, a sewage jar lid that closes an opening through an underground buried object in a sewer, an underground structure facility, etc. and the ground, An openable and closable joint groove iron cover, power transmission iron cover, power distribution iron cover, underground conduits under the road surface in waterworks and gas pipes and their associated equipment and the ground Of the fire hydrant lids, water control valve lids, gate valve lids, air valve lids, gas piping lids, water meter lids, etc. that have a function as an open / close door that connects the two, they are generic names.

  A conventional round lid for an underground structure generally has a gradient receiving structure in which the lid body is fitted and supported by the receiving frame by causing the inclined surface of the outer periphery of the lid body to bite into the inclined surface of the inner periphery of the receiving frame. As a circular lid for an underground structure having a gradient receiving structure, Patent Document 1 describes an inclination angle of a gradient surface with respect to a vertical plane, that is, a gradient angle limited to 5 ° to 10 °. In the thing of patent document 1, by limiting a gradient angle as mentioned above, the amount and force of the biting with respect to the receiving frame of a lid body can be secured enough, and shakiness, vibration, and noise of a lid body can be secured. In addition to being able to be remarkably suppressed, it is possible to produce an effect that the lid body does not slide up (a phenomenon that bites in diagonally rather than horizontally).

  However, in the underground structure lid described in Patent Document 1, although the above-described effects are achieved, depending on the installation environment, an excessive bite force may be generated in the receiving frame of the lid body, so that it is opened with a bar. When the lid is closed, a great deal of labor may be required, which may make it difficult to open the lid.

In addition, in the conventional round lid for underground structures, when the lid body is closed after opening, it is placed in the receiving frame by dragging the lid body with a bar, or the lid body is pushed diagonally downward from the rear. In this case, the front part of the lid main body may fall largely into the receiving frame, and when the lid main body is pushed further in this state, the left and right sides of the front part of the lid main body are the inner peripheral surface of the receiving frame ( The lid body cannot be pushed in any further. This state is illustrated in FIG. 5, in which FIG. 5 (a) shows a cross section thereof, and FIG. 5 (b) is a contact portion between the outer peripheral side surface of the lid body and the upper inner peripheral surface of the receiving frame ( The cross section of the principal part of (AA line part) is shown. In the state shown in the figure, the front left and right side surfaces of the lid body 10 are fitted in contact with the upper end of the vertical wall 24 of the receiving frame 20. In such a state, the lid body 10 cannot be pushed any further, and the operator must lift the front part of the lid body 10 again to close the lid. There was also a problem of becoming longer.
JP-A-53-72357

  The problem to be solved by the present invention is that an excessive biting force to the receiving frame of the lid main body can be prevented and the lid can be opened with an appropriate effort. An object of the present invention is to provide a round lid for an underground structure that can smoothly fit the lid body into the receiving frame by simply dragging the lid body or simply pushing the lid body into the receiving frame from behind.

In order to solve the above-mentioned problems, the present invention provides a round lid for an underground structure comprising a round lid body and a receiving frame that supports the lid body at the upper part of the inner peripheral surface. Is formed with a receiving frame convex curved surface portion that protrudes inward of the receiving frame, a receiving frame wall surface portion above the receiving frame convex curved surface portion, and a receiving frame inclined surface portion that is reduced in diameter toward the lower side of the receiving frame. A convex convex curved surface portion is formed on the outer peripheral side surface portion of the lid main body, and the lid wall surface portion is compressed above the convex convex convex portion of the lid, and is contracted downward below the lid main body. In the closed state where the lid inclined surface portion is formed and the lid main body is supported by the receiving frame, only the lid inclined surface portion and the receiving frame inclined surface portion are taper- fitted, and the other on the outer peripheral side surface of the lid main body and the upper inner peripheral surface of the receiving frame A gap is formed in this portion.

  In the above configuration, the lid body has a lid inclined surface portion below the outer peripheral side surface portion taper-fitted to a receiving frame inclined surface portion below the inner peripheral surface upper portion of the receiving frame, and rattling, vibration, noise, etc. are suppressed to the receiving frame. Supported. On the other hand, portions other than the lid inclined surface portion and the receiving frame inclined surface portion are not in contact with each other, and a gap that opens upward is formed. Thus, since the gap | interval which is not fitted is formed above the cover main body and receiving frame which generate | occur | produce a big biting force, generation | occurrence | production of an excessive biting force can be suppressed.

  When the lid body is pushed into the receiving frame from behind the lid body when the lid is closed, the lower side of the lid convex curved surface portion of the lid body contacts the upper side of the receiving frame convex curved surface portion of the receiving frame, and the lid main body is further moved from the rear side. When pressed, the lid convex curved surface portion is guided by the receiving frame convex curved surface portion while the contact portion between the lid convex curved surface portion of the lid main body and the receiving frame convex curved surface portion of the receiving frame gradually moves to the front portion of the lid main body. Therefore, the lid body can be smoothly accommodated in the receiving frame simply by pushing the lid body from the rear.

  In the present invention, only the lid inclined surface portion below the outer peripheral side surface portion of the lid main body and the receiving frame inclined surface portion below the upper portion of the inner peripheral surface of the receiving frame are taper-fitted, and a gap that opens upward is formed without contacting other portions. Therefore, rattling, vibration, noise and the like of the lid body can be suppressed, and generation of excessive biting force can be suppressed.

  In addition, since the receiving frame convex curved surface portion that is convex toward the inside of the receiving frame is formed on the inner peripheral surface of the receiving frame, and the convex lid convex curved surface portion is formed on the outer peripheral side surface portion of the lid body. When the lid is closed, the lid convex curved surface moves while being guided by the receiving frame convex curved portion, and the lid body can be dragged from the rear or the lid main body can be smoothly stored in the receiving frame simply by pushing the lid main body from the rear. it can.

  FIG. 1 is an exploded perspective view of a round lid for an underground structure according to the present invention. The round lid for an underground structure according to the present invention includes a round lid body 10 and a receiving frame 20 that supports the lid body 10 at the upper part of the inner peripheral surface. The lid body 10 is attached to the receiving frame 20 by a hinge hardware (not shown). On the other hand, it is connected so that opening and closing is possible. The round lid for an underground structure is attached to, for example, the upper end portion of the upper side lump of the manhole, and is installed so that the upper end surface thereof is flush with the ground surface.

  FIG. 2 is a longitudinal sectional view of a main part in a closed state in which the lid body 10 is supported by the receiving frame 20. As shown in the figure, a receiving frame convex curved surface portion 21 convex toward the inside of the receiving frame 20 is formed on the inner peripheral surface of the receiving frame 20, and a concave portion is formed above the receiving frame convex curved surface portion 21. A curved receiving frame wall surface portion 22 is formed continuously. In addition, a receiving frame inclined surface portion 23 whose diameter decreases toward the lower side of the receiving frame 20 is formed below the receiving frame convex curved surface portion 21.

The lid body 10 has a convex lid convex curved surface portion 11 formed on the outer peripheral side surface of the edge winding portion 10a, and a lid wall surface portion 12 is continuously formed above the lid convex curved surface portion 11. Yes. In addition, a lid inclined surface portion 13 that is reduced in diameter toward the lower side of the lid main body 10 is formed below the lid convex curved surface portion 11 . The inclination angle (gradient angle) with respect to the vertical plane of the lid inclined surface portion 13 and the receiving frame inclined surface portion 23 is the same angle within a range of 5 ° to 10 °. In the closed state, only the lid inclined surface portion 13 and the receiving frame inclined surface portion 23 are taper-fitted, and other portions are not in contact with each other and a gap g that opens upward is formed. When the lid inclined surface portion 13 and the receiving frame inclined surface portion 23 are taper-fitted, the lid main body 10 is fitted and supported on the receiving frame 20 while suppressing rattling, vibration, noise, and the like.

  Here, since the lid body 10 has the top plate 10b in the upper part, the upper body has high rigidity against the lateral force, and the upper part of the edge winding part 10a is not easily deformed. For this reason, if the cover wall surface part 12 and the receiving frame wall surface part 22 of the upper part of the edge winding part 10a are taper-fitted, the big biting force (clamping force) by the reaction force from the receiving frame 20 which opposes will generate | occur | produce. . On the other hand, since the lower part of the edge winding part 10a is not supported by the top plate 10b, it has lower rigidity than the upper part, and is easily distorted and deformed. For this reason, when the lid inclined surface portion 13 below the edge winding portion 10a is taper-fitted to the receiving frame inclined surface portion 23, the lid inclined surface portion 13 tends to be slightly deformed, so that the biting force is reduced. In the present invention, as described above, by forming the gap g at the upper part of the edge winding part 10a, the upper part of the edge winding part 10a that generates a large biting force is not taper-fitted, but only at the lower part of the edge winding part 10a. Since they are combined, it is possible to prevent excessive biting force from being generated.

  Next, the closing operation of the round lid for underground structures according to the present invention will be described with reference to FIG. (A) of the figure shows a cross section of the state in which the lid main body is horizontally swiveled to close the lid after the lid is opened, and this is substantially overlapped with the receiving frame, and (b) of FIG. The cross section of the principal part of the contact part (AA line part of the figure (a)) with the inner peripheral surface upper part of a receiving frame is shown. As shown in FIG. 3B, in a state where the lid body 10 is substantially overlapped with the receiving frame 20 for closing, the lower side of the lid convex curved surface portion 11 comes into contact with the upper side of the receiving frame convex curved surface portion 21, and the lid main body 10. Is largely prevented from falling into the receiving frame 20. In this state, when the rear portion of the lid main body 10 (left end portion in FIG. 3A) is pushed by the foot and the lid main body 10 is pushed obliquely downward, the contact portion of the lid convex curved surface portion 11 with the receiving frame convex curved surface portion 21 As the cover gradually moves forward (to the right in FIG. 3A), the cover convex curved surface portion 11 is guided by the receiving frame convex curved surface portion 21. Along with this, the front portion of the lid main body 10 (the right end portion in FIG. 3A) rises so as to rise, and finally the lid main body 10 is completely accommodated in the receiving frame 20. Thus, in the round lid for an underground structure according to the present invention, the lid body 10 moves while the lid convex curved surface portion 11 is guided by the receiving frame convex curved surface portion 21 when the lid is closed. The lid body 10 can be smoothly accommodated in the receiving frame 20 simply by pushing.

  FIG. 4 is a longitudinal sectional view of an essential part showing another embodiment of the present invention. The same components as those in the previous embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the present embodiment, only the lid convex curved surface portion 11 and the receiving frame convex curved surface portion 21 are curved surfaces, and the other portions are formed in a planar shape in a sectional view. Also in this embodiment, the same effect as the previous embodiment can be obtained.

  Although the round lid for underground structures according to the present invention can be used for all purposes, it is particularly useful as a device installed in a place where there is a high possibility of excessive biting force such as a roadway. .

It is a disassembled perspective view of the round lid for underground structures of the present invention. It is a longitudinal cross-sectional view of the principal part in the closed state which supported the cover main body with the receiving frame. It is explanatory drawing of the lid closing operation in the round lid for underground structures of this invention. It is a longitudinal cross-sectional view of the principal part which shows the other Example of this invention. It is explanatory drawing of closing operation in the conventional round lid | cover for underground structures.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cover body 10a Edge winding part 10b Top plate 11 Cover convex curved surface part 12 Cover wall surface part 13 Cover inclined surface part 20 Receiving frame 21 Receiving frame convex curved surface part 22 Receiving frame wall surface part 23 Receiving frame inclined surface part 24 Vertical wall

Claims (1)

In a round lid for an underground structure with a gradient receiving structure comprising a round lid body and a receiving frame that supports the lid body at the upper part of the inner peripheral surface,
A receiving frame convex curved surface that is convex toward the inside of the receiving frame is formed at the upper part of the inner peripheral surface of the receiving frame, and the receiving frame wall surface is formed above the receiving frame convex curved surface, and the lower is directed downward of the receiving frame. Forming a receiving frame inclined surface portion that is reduced in diameter,
A convex lid convex curved surface portion is formed on the outer peripheral side surface portion of the lid main body, and the lid wall surface portion is formed above the convex convex curved surface portion, and the lid inclination is reduced in diameter toward the lower portion of the lid main body. Forming the face,
In the closed state in which the lid body is supported by the receiving frame, only the lid inclined surface portion and the receiving frame inclined surface portion are taper- fitted, and a gap is formed in the outer peripheral side surface portion of the lid main body and other portions on the upper inner peripheral surface of the receiving frame. A round lid for underground structures, characterized by doing so.

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