JP2520914Y2 - Manhole cover device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole cover device, and more particularly to a structure for easily trimming an edge of a manhole cover device in which a cover body is taperedly fitted to a receiving frame.

[0002]

BACKGROUND ART Conventionally, in underground buried structures such as water and sewage systems, gas or fire hydrants, an opening of a manhole as an entrance and exit provided for maintenance and management has an annular receiving frame and an opening of the receiving frame. There is installed a manhole cover device that is composed of a cover that opens and closes.

In recent years, the lid is prevented from bouncing and rattling due to impact when a vehicle or the like passes over the upper surface of the lid, and when the internal pressure in the manhole rises,
The inner peripheral surface of the receiving frame is a tapered receiving surface so that the lid does not come off, while the outer peripheral surface of the lid is a tapered fitting surface corresponding to the tapered receiving surface of the receiving frame. A manhole cover device having a structure in which the receiving frame and the cover body are taper-fitted with each other has been widely spread and is installed in the field.

By the way, in the manhole cover device having such structure, the taper fitting between the receiving frame and the cover body allows
Since the lid body is held by the "wedge" effect with respect to the receiving frame, the detachment of the lid body is effectively prevented, but on the other hand, such fitting and holding is time-dependent. It often happens that the lid becomes too strong and it becomes difficult to open the lid.

That is, in such a manhole cover device, when the manhole cover device is initially installed, the fitting force between the receiving frame and the cover body is about 3 tons, and such a manhole cover device has a predetermined distance to the peripheral portion of the cover body. By inserting and engaging one end of the burl (dedicated device) into any one of the multiple opening holes that are separated from each other, and by artificially applying a pressing force to the other end, the lever principle facilitates Although it is possible to open the lid, if some years have passed since installation, the force of biting into the receiving frame of the lid may increase as heavy objects such as vehicles pass through the top of the lid. Increase, and the fitting part between the receiving frame and the lid corrodes,
Furthermore, if the receiving frame and the lid are fitted to each other too strongly due to the sand or the like being bitten into the fitting portion, the fitting force may be 5 tons or more when the fitting is required. However, in such a manhole cover device, it was impossible to open the cover only by the cover opening work using the above-mentioned bar.

Therefore, in order to open the lid device in which such a lid is tightly fitted, the upper surface of the outer peripheral edge of the lid is repeatedly hit with a hammer or the like at several places, and The work of loosening the fitting portion between the receiving frame and the lid by the impact force, cutting the edges, and then opening the lid with the burl is performed.In such work,
The impact of the hammer is applied downwards, which makes the fitting between the receiving frame and the lid stronger, so the impact force does not directly loosen the fitting, and the receiving frame and lid are fitted together. In order to cut the edge of the portion, a force larger than the fitting force is required, and therefore, a large amount of time and labor is required for the lid opening work, and there is a problem that the workability is extremely poor.

As described above, in the manhole cover device in which the fitting portion between the receiving frame and the cover body is formed in a taper shape, the effect of preventing the separation of the cover body is excellent, but on the other hand, the number of years after construction has passed. As a result, the fitting between the receiving frame and the lid becomes too strong,
There is an inherent problem that opening the lid becomes very difficult, and it is a very big problem especially in the lid device of the underground structure that requires quick work in an emergency. Therefore, in reality, such a manhole cover device is not used as a cover device for a fire hydrant.

[0008]

The present invention has been made in view of such circumstances, and a problem to be solved by the present invention is a manhole cover device capable of preventing detachment of a cover body as described above. In, in the underground structure, the edge of the fitting portion between the receiving frame and the lid can be easily and quickly cut, thereby improving the workability of the lid opening work, and thus prompt work in an emergency is required. The present invention provides a manhole cover device suitable for use in the cover device.

[0009]

In order to solve the above problems, in the present invention, the inner peripheral surface of the receiving frame installed around the opening of the manhole is formed into a tapered receiving surface, and The outer peripheral surface of the lid body that is fitted and covers the opening of the manhole is a tapered fitting surface corresponding to the tapered receiving surface of the receiving frame, and the receiving frame and the lid body are taper-fitted. In the manhole cover device configured as described above, (a) a striking pin which is housed in the receiving frame so as to be movable in the vertical direction and whose upper surface is exposed to the upper surface of the receiving frame and serves as a striking surface;
(B) It is attached to the receiving frame rotatably in a vertical direction with a horizontal rotation shaft, is engaged with the striking pin at one end side, and is rotated by a pressing force given by striking the striking pin. A rotating metal fitting that causes a rotating action around the moving shaft, and is brought into contact with the lower surface of the outer peripheral edge portion of the lid body at the other end side to exert a pushing force on the lid body by the rotation. Is provided.

[0010]

In other words, in such a manhole cover device, the upper surface is exposed to the upper surface of the receiving frame, and the striking pin serving as the striking surface is accommodated in the receiving frame so as to be vertically movable. , A rotation metal fitting, which is rotatable vertically with a horizontal rotation shaft, is engaged with the striking pin on one end side and faces the lower surface of the outer peripheral edge portion of the lid body on the other end side. Since the striking surface of the striking pin exposed on the upper surface of the receiving frame is striking with a hammer or the like, the striking pin is impacted and pushed down, whereby the striking pin engaged with the striking pin on one end side is rotated. The moving fitting is given a shocking turning action about the turning axis. Then, due to this pivoting action, an upward force is impulsively generated on the other end side of the pivoting metal fitting, thereby contacting the lower surface of the outer peripheral edge portion of the facing lid, By exerting a pushing-up action on the lid body, it is possible to push up the lid body from the back surface.

Therefore, in such a manhole cover device, a hammer or the like only gives a striking force to the striking surface on the upper surface of the receiving frame, which is approximately the same as the fitting force between the receiving frame and the lid body. To the surface direction, in other words, a shocking lifting force acts in the direction of releasing the fitting of the lid body, whereby the fitting of the lid body and the receiving frame can be effectively loosened, and Since the edge of the receiving frame and the lid can be cut easily and in a short time, it is possible to dramatically improve the workability for opening the manhole lid device.
It can be suitably used as a manhole cover device for underground structures such as fire hydrants that require quick work in an emergency.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will now be described in detail with reference to the drawings in order to clarify the present invention more specifically.

First, FIG. 1 is an explanatory view showing a specific example of a manhole cover device according to the present invention, in which the upper half shows the upper surface form and the lower half shows the back surface form. There is. In FIG. 1, reference numeral 10 denotes a manhole cover device, which is an annular receiving frame 12 and the receiving frame 1
It is composed of a disk-shaped lid 14 that is fitted in the second opening and closes it, and, as is well known, is fixedly installed in the opening of a predetermined manhole in the receiving frame 12. It is supposed to be done. A bar is inserted into the outer peripheral edge of the lid 14 when opening the lid.
A plurality of (here, three) burl holes 16 for engagement are provided at a predetermined distance in the circumferential direction.

As is clear from the vertical sectional view of the manhole cover device shown in FIG. 2, the receiving frame 12 has a cylindrical inner peripheral wall portion 18 and an outer peripheral wall portion 20.
It is configured by a disc-shaped coupling wall portion 22 that couples them in the vicinity of their respective upper ends, and has an annular shape with a hollow inside as a whole. Further, in this receiving frame 12, a plurality of (here, 12) ribs 24 are radially arranged in the hollow portion between the inner peripheral wall portion 18 and the outer peripheral wall portion 20 at predetermined intervals in the circumferential direction. Connection wall 22
It is provided to reinforce (see FIG. 1). And
The receiving frame 12 is placed on the concrete foundation and fixedly mounted on the inner peripheral wall portion 18 and the outer peripheral wall portion 20 in a conventional manner. On the other hand, the lid 1
4 has a disc shape, and a hanging portion 26 extending downward by a predetermined length is provided on an outer peripheral edge portion thereof. An outer peripheral surface of the hanging portion 26 has an inner peripheral wall portion 18 of the receiving frame 12. The lid 14 is fitted to the inner peripheral surface of the
It is designed to close the opening of the.

Further, as shown in FIG. 3, which is an enlarged cross-sectional explanatory view of an essential part of the manhole cover device, in which the fitted state of the receiving frame 12 and the lid 14 is made clearer, as shown in FIG. A tapered receiving surface 28 having a smaller diameter toward the axial lower side is formed at the upper portion of the inner peripheral surface of 18, and an annular step portion extending inward in the radial direction is formed at a substantially intermediate portion thereof. 30 is provided, on the other hand, a tapered fitting surface 32 corresponding to the receiving surface 28 is formed on the outer peripheral surface of the hanging portion 26 of the lid body 14. And the stepped portion 3
With respect to the receiving surface 28 of the inner peripheral wall portion 18 whose lower end edge is defined by 0, the lid 14 is attached to the receiving surface 28 of the receiving surface 28 so that the opening (of the receiving frame 12) can be opened and closed. The tapered fitting surface 32 formed on the outer peripheral surface is adapted to be fitted by taper, whereby the receiving surface 28 and the fitting surface 32 are fitted together by the wedge effect. Thus, the lid 14 is prevented from being detached due to a shock when a vehicle or the like passes or an increase in internal pressure in the manhole.

Further, in addition to FIGS. 1 and 2, as is apparent from the enlarged cross-sectional explanatory view of the main part shown in FIG. 4, the receiving frame 1
The plurality of circular recesses 34 opening toward the upper surface of the receiving frame 12 are provided in the connecting wall portion 22 of No. 2 at predetermined intervals in the circumferential direction (here, three), and Through holes 36 penetrating downward are formed at the bottoms of the recesses 34.
Each is formed. And each recess 34
The inside of the recess 34 has a head portion slightly smaller than the opening size of the recess 34 and a leg portion extending below the head portion.
A striking pin 38, which is sufficiently longer than the depth of, is accommodated movably in the vertical direction in the form of compressing the coil spring 40, and the through hole 36 provided in the bottom of the recess 34 is It penetrates and projects downward by a predetermined length. Also, this striking pin 38
The upper surface of the head is configured as a striking surface 42 that is struck with a hammer or the like when the lid is opened to receive the striking force, and the leg portion is formed with a threaded portion 44. Then, in the threaded portion 44 of the striking pin 38,
The nut 46 is screwed together, and by adjusting the screwing position of the nut 46, upward movement of the coil spring 40 due to the urging force is restricted by contact between the upper surface of the nut 46 and the lower surface of the bottom of the recess 34. Thus, the striking surface 42 and the surface of the receiving frame 12 are flush with each other.

On the other hand, between the ribs 24, 24 of the receiving frame 12, support ribs 48, 48 are provided so as to be located on both sides of the recess 34, and the support ribs 48, 48 are provided. Between them, a rotary shaft 50 that is horizontal with respect to the receiving frame 12 is installed so as to be located inside the recess 34 in the radial direction of the receiving frame 12, and with the rotating shaft 50, A rotating metal fitting 52 is attached so as to be rotatable in the direction. The rotating metal fitting 52 extends below the outer peripheral edge portion of the lid body 14 through a push-down arm portion 56 that extends right below the striking pin 40 and the notch 58 of the inner peripheral wall portion 18, and a lid is attached to the upper surface thereof. The body contact portion 54 is configured by a push-up arm portion 60 provided in a protruding manner.
Further, in the rotating metal fitting 52, since the push-up arm portion 60 side is heavier than the push-down arm portion 56 side, the push-down force by the striking pin 38 is not applied to the state of FIG. Occasionally, a rotational moment is applied so that a rotational action is generated in a clockwise direction about the rotational shaft 50, and therefore the push-down arm portion 56 has a lower end of the striking pin 38 on its upper surface. The push-up arm portion 60 is brought into a state of facing the lower surface of the outer peripheral edge portion of the lid body 14 at a predetermined interval at the lid contact portion 54 projectingly provided on the upper surface thereof.
As a result, free rotation of the rotating fitting 52 when the lid is open is prevented. The position of the rotary shaft 50 in the rotary metal fitting 52, in other words,
The stroke of the push-down arm portion 56 and the push-up arm portion 6
The ratio of the stroke size of 0 is appropriately determined according to the strength of the striking force applied and the pushing width of the lid.

Therefore, in the manhole cover device having such a structure, when a striking force is applied to the striking surface 42 of the striking pin 38 with a hammer or the like, the striking pin 38 is impacted and pushed down, whereby the pushing down arm portion. At 56, the rotating metal fitting 52 engaged with the lower end portion of the striking pin 38 is caused to have a shocking rotation action about the rotation shaft 50, and at the pushing-up arm portion 60, an impact is generated. As a result, an uplifting force is generated, so that the lid 14 is pushed up by contacting the lower surface of the outer peripheral edge portion of the opposing lid 14 and pushing the lid 14 from the back surface. Apply lifting force. When such a shocking pushing force acts on the lid body 14 from the back surface, the lid body 14 and the receiving frame 12
Since the fitting of the taper and the taper fitting portion is effectively loosened, effective edge cutting can be performed. The striking pin 38 is pushed up in the opposite direction by the urging force of the coil spring 40 after pushing down the pushing arm portion 56 of the rotating fitting 52, but the recessed portion of the nut 46 screwed to the lower portion thereof. 34
By contacting the bottom surface of the bottom of the
The striking surface 42 returns to a state in which it has the same height as the surface of the receiving frame 12.

As described above, according to the manhole cover device according to the present embodiment, even if the receiving frame 12 and the cover body 14 are too tightly fitted to each other and the cover cannot be opened only by the burl, the striking pin 38 is used. By applying a striking force to the striking face 42 of the same with a hammer or the like, the receiving frame 1
The edge of the lid 2 and the lid 2 can be cut easily and in a short time, and thus the lid can be easily opened.

Further, in such a manhole cover device, since the striking surface 42 and the surface of the receiving frame 12 are ensured to be flush with each other, at the time of striking at the time of opening the lid,
It has the advantage that it can be easily hit, and when a person or the like passes over the upper surface of the lid 14, the hitting pin 40 is used.
Does not become an obstacle, and there is an advantage that wear and deformation of the striking surface 38 due to passage of a vehicle or the like can be effectively prevented.

Although one embodiment of the present invention has been described in detail with reference to the drawings, this is a literal example, and the present invention should not be construed as being limited to such a specific example. Absent. It should be understood that various changes, modifications, improvements, and the like can be made to the present invention based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

For example, in the above-described embodiment, the striking pin 38 is housed in the recess 34 of the receiving frame 12 against the biasing force of the coil spring 40, whereby at least the striking pin 38 is given a striking force and is pushed down. When hit, a return force sufficient to return the striking pin 38 to the normal position can be exerted, and such a returning action is desirable for realizing the device of the present invention. The acting mechanism of the returning force is not limited to the above-mentioned example, and various hitherto known mechanisms can be used to move the striking pin 38 in the vertical direction. Any of the mechanisms can be appropriately adopted.

Further, in the above embodiment, the rotating metal fitting 52 is
Although it is rotatably supported by the support rib 48 in the vertical direction by the horizontal rotation shaft 50 and attached to the receiving frame 12, it is not always necessary to adopt a structure for attaching via the support rib 48. The rotating fitting 52 is the receiving frame 1
Any structure may be used as long as it can be rotatably attached to and supported in the vertical direction with respect to 2, and can be directly rotatably attached to the existing rib 24 or the inner peripheral wall portion 18. Is possible, and by doing so,
The rotating shaft 50 and the rotating metal fitting 52 are attached to the existing receiving frame.
It has the advantage that it can be mounted advantageously.

Further, in the above-mentioned embodiment, the threaded portion 44 is provided in the lower portion of the striking pin 38, and the nut 46 is screwed into the threaded portion 44 to restrict the upward movement of the striking pin 38. While the striking face 42 and the surface of the receiving frame 12 are secured flush with each other, the striking pin 38 is prevented from projecting or falling out of the receiving frame 12, but even if a nut pin is used instead of the nut 46, It is possible to obtain the same effect as that of the above embodiment.

Furthermore, in the above embodiment, the striking pin 3 is used.
The striking face 42 of No. 8 is flat and has the same height as the surface of the receiving frame 12 and is exposed on the upper surface of the receiving frame 12. The striking face 42 is a spherical convex surface and protrudes on the upper surface of the receiving frame 12. However, the height of the coil spring 42 may be lower than the predetermined height due to dimensional error during installation, fatigue due to metal fatigue over time after installation, or the like. Also, at least a part of the striking surface 42 is projected to the upper surface of the receiving frame 12,
Since the whole is not recessed in the recess 34, it is possible to enjoy the advantage that the striking surface 38 can always be in a state where it can be easily striking.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a manhole cover device according to the present invention, in which an upper half shows a top surface form and a lower half shows a back surface form thereof.

2 is a vertical cross-sectional view of the device shown in FIG. 1, which is a view corresponding to a II-II cross section in FIG.

FIG. 3 is an enlarged cross-sectional explanatory view of essential parts showing a fitted state of the receiving frame and the right portion of the lid body in FIG. 2;

FIG. 4 is an enlarged cross-sectional explanatory view of an essential part showing a fitting state of a left portion of the receiving frame and the lid body in FIG.

[Explanation of reference numerals] 10: Manhole cover device 12: Receiving frame 14: Lid body 28: Receiving surface 32: Fitting surface 34: Recess 38: Impact pin 40: Coil spring 42: Impact surface 50: Rotating shaft 52: Rotation Moving metal fitting 56: Push down arm section 60: Push up arm section

Claims (1)

(57) [Scope of utility model registration request] 1. A lid for covering the opening of the manhole by fitting an inner peripheral surface of a receiving frame installed around the opening of the manhole into a tapered receiving surface and fitting the receiving frame. In a manhole cover device in which the outer peripheral surface is a tapered fitting surface corresponding to the tapered receiving surface of the receiving frame so that the receiving frame and the lid body are taper-fitted, the manhole cover device is moved vertically in the receiving frame. And a striking pin whose upper surface is exposed to the upper surface of the receiving frame and serves as a striking surface. The striking pin is attached to the receiving frame so as to be vertically rotatable with a horizontal pivot shaft, and is attached to the striking pin at one end side. While being engaged with each other, the pressing force given by the striking of the striking pin causes a rotating action around the rotating shaft, while the other end side is brought into contact with the lower surface of the outer peripheral edge portion of the lid body. , Push up against the lid by turning A pivot bracket that exerting a force, the manhole cover and wherein the provided.