JPH07229160A - Manhole cover with inspecting window - Google Patents

Abstract

PURPOSE:To facilitate the inspection within a manhole. CONSTITUTION:A manhole cover body 10 has an inspecting window 11. The inspecting window 11 is blocked by an inspecting window cover 12 in such a manner as to be openable and closable. The periphery of the inspecting window cover 12 is partially mounted on the manhole cover body 10 by a hinge in such a manner as to be openable and closable. The other part of the inspecting window cover 12 is fixed to the manhole cover body 10 by a bolt 14. The head part 14a of the bolt 14 is housed in the recessed part 15 of the inspecting window cover 12. A cap 16 for covering the head part 14a of the bolt 14 is fitted to the recessed part 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole cover with an inspection window for opening and closing a manhole containing equipment such as electric power, communication and water.

[0002]

2. Description of the Related Art As shown in FIGS. 5 and 6, a manhole 2 is formed under a ground 1 by being surrounded by a concrete wall 3, and a device 4 such as electric power, communication and water is housed in the manhole 2. In this case, at the entrance 2A of the manhole 2, a mounting frame body 5 made of cast iron or the like is fixed to the upper edge of the concrete wall 3, and a recess 6 at the inner peripheral edge thereof is supported in the mounting frame body 5. As a manhole cover 7 made of cast iron or the like for closing the inlet 2A of the manhole 2 is arranged, the manhole cover 7 is attached by bolts 9 inserted into bolt through holes 8 penetrating a plurality of recesses 7A at the periphery thereof. The bolts 8 are fixed to the frame body 5, and the heads of the bolts 8 are housed in the recesses 7A of the manhole cover 7, respectively.

The manhole 2 containing the equipment 4 in this way
In order to perform a patrol inspection (for example, check of thermometer, confirmation of presence or absence of blowout of directly attached cut-out fuse, confirmation of appearance of device 4, etc.), it is necessary to remove each bolt 9 and open the manhole cover 7. was there.

[0004]

However, the inspection of the inside of the manhole 2 by opening the manhole cover 7 has a problem in that the manhole cover 7 is made of iron or the like and is very heavy, and the workability is poor.

It is an object of the present invention to provide a manhole cover with an inspection window that allows easy patrol inspection in the manhole.

Another object of the present invention is to provide a manhole cover with an inspection window, in which a patrol inspection in the manhole can be easily performed by using the inspection window, and the inspection window cover that closes the inspection window can be fixed securely. To do.

Another object of the present invention is to provide a manhole cover with an inspection window, in which a patrol inspection in the manhole can be easily performed by using the inspection window, and the inspection window cover that closes the inspection window can be easily opened and closed. To do.

[0008]

The constitution of the present invention which achieves the above object will be described as follows.

In the manhole cover with the inspection window of the present invention, the inspection hole is provided in the manhole cover body, and the inspection window is closed by the inspection window cover so as to be openable and closable. The inspection windows may be provided according to the inspection points, and when the inspection points are separated, a plurality of inspection windows may be provided.

When the inspection window is closed by the inspection window cover so as to be openable and closable, how to attach the inspection window cover to the inspection window is arbitrary. For example, the inspection window cover can be fixed to the manhole cover body with a plurality of bolts. In this case, it is preferable to form recesses for accommodating the heads of the bolts at the ends of the plurality of bolt through holes formed in the inspection window cover. In this way, the head of the bolt does not project from the manhole cover body, and the head of the bolt does not get in the way. If the head of the bolt is exposed, depending on the installation location, the bolt may be removed by mischief, and the recess may be clogged with dust or dirt, making it difficult to remove the bolt. In such a case, it is preferable to fit a cap that covers the head of the bolt into the recess.

When the inspection window is closed by the inspection window cover so that it can be opened and closed, a part of the periphery of the inspection window cover is attached to the manhole cover body by a hinge so that the other part of the inspection window cover can be opened and closed with bolts. It may be fixed to. In this way, the number of bolts can be reduced, and the work of positioning the inspection window lid when bolting is unnecessary. In this case as well, it is preferable that the heads of the bolts be housed in the recesses provided in the inspection window lid, and the caps be fitted into the recesses.

[0012]

By providing the inspection window on the manhole cover body in this manner, inspection can be performed through the inspection window without opening the heavy manhole cover body. Therefore, the inspection work can be performed efficiently.

If the inspection window is opened and closed with the inspection window lid, the inspection window can be closed except during inspection.

If the inspection window cover is fixed to the manhole cover body with a plurality of bolts, the inspection window cover can be securely fixed to the manhole cover body.

If a part of the periphery of the inspection window cover is attached to the manhole cover main body by means of a hinge so that the inspection window cover can be opened and closed, the inspection window cover can be opened and closed easily.

[0016]

1 to 3 show a first embodiment in which a manhole cover with an inspection window according to the present invention is applied to a manhole cover in which a transformer used in an underground power distribution system is housed. is there. In the manhole cover 7 of this embodiment, a square inspection window 11 is provided in a manhole cover body 10 made of cast iron or the like, and the inspection window 11 is closed by an inspection window cover 12 made of cast iron or the like so as to be openable and closable. . The inspection window lid 12 is the inspection window 1
It is composed of an inner wall portion 12a which is inserted into the inner wall 1 and an outer wall portion 12b which is housed in a concave portion 13 provided in the manhole cover main body 10 along the inspection window 11. The inspection window cover 12
It is fixed to the manhole cover body 10 with four bolts 14. Bolt through holes into which the bolts 14 are inserted are formed at four corners of the outer wall portion 12b of the inspection window lid 12, and a recess 15 for accommodating the head of the bolt 14 is formed at an outer end portion of each bolt through hole. Are formed. The screw portion of the bolt 14 is screwed into a female screw portion formed on the manhole cover body 10. A cap 16 that covers the head 14a of each bolt 14 is fitted into each recess 15. The cap 16 is made of synthetic rubber or the like.

When inspecting the manhole 2 with the manhole cover 7 having such a structure, each cap 16 is removed,
The inspection window lid 12 is opened by removing the bolts 14.
Then, the inspection is performed through the inspection window 11.

In this way, inspection can be performed through the inspection window 11 without opening the heavy manhole cover body 10, and the inspection work can be performed efficiently.

FIG. 4 shows a second embodiment of the manhole cover with inspection window according to the present invention. In the manhole cover 7 of this embodiment, a square inspection window 11 is provided in a manhole cover body 10 made of cast iron or the like, and the inspection window 11 is openably and closably closed by an inspection window cover 12 made of cast iron or the like. The inner wall portion 12a of the inspection window lid 12 is inserted into the inspection window 11, and the outer wall portion 12b is housed along the inspection window 11 in a recess 13 provided in the manhole lid body 10. A pin 17 forming a hinge or a part of a hinge mechanism is inserted into one end of the rectangular outer wall portion 12b of the inspection window lid 12. The pin 17 is supported by the inner wall of the recess 13 provided in the manhole cover body 10. As a result, the inspection window cover 12
It is attached to the manhole cover body 12 so that it can be opened and closed. The end of the inspection window cover 12 opposite to the end into which the pin 17 is inserted is fixed to the manhole cover body 10 with a bolt 14. The head 14a of the bolt 14 is housed in a recess 15 formed in the inspection window cover 12, and a cap 16 that covers the head 14a of the bolt 14 is fitted in the recess 15. The cap 16 is made of synthetic rubber or the like.

When inspecting the manhole 2 with the manhole cover 7 having such a structure, each cap 16 is removed,
The inspection window cover 12 is opened by removing the bolt 14. Then, the inspection is performed through the inspection window 11.

In this way, inspection can be performed through the inspection window 11 without opening the heavy manhole cover body 10. In particular, if the inspection window cover 12 is attached to the manhole cover main body 12 by means of a hinge so that the inspection window cover 12 can be freely opened and closed as in this embodiment, the inspection window cover 12 can be easily opened and closed.
Further, the number of bolts 14 used can be reduced, and the time required to open and close the inspection window lid 12 can be shortened.

In each of the above embodiments, the inspection window lid 12 has a quadrangular shape, but the inspection window lid 12 is not limited to a quadrangular shape, and may have an appropriate shape such as a round shape. .

If a waterproof sealing body such as packing is interposed between the periphery of the inspection window lid 12 and the concave portion 13 of the manhole cover body 10, the inspection window 11 can be protected by the inspection window 11 with a waterproof property. Can be closed.

Further, the inspection window cover 12 can be locked to the manhole cover main body 10 with a lock or the like so as not to be opened or closed by a third person.

Further, a transparent glass or a see-through magnifying lens can be attached to the inspection window cover 12. In this way, the state inside the manhole 2 can be inspected without opening the inspection window cover 12.

[0026]

As described above, according to the manhole cover with the inspection window of the present invention, the following excellent effects can be obtained.

In the present invention, since the inspection window is provided in the manhole cover body, inspection can be performed through this inspection window without opening the heavy manhole cover body. Therefore, the inspection work can be performed efficiently.

Further, in the present invention, since the inspection window is closed by the inspection window lid so that it can be opened and closed, the inspection window can be closed except when the inspection is performed, and foreign matter and the like enter the manhole through the inspection window. Can be prevented.

Further, in the present invention, since the inspection window cover is fixed to the manhole cover main body with a plurality of bolts, the inspection window cover can be securely fixed to the manhole cover main body.

Further, in the present invention, since a part of the peripheral edge of the inspection window lid is attached to the manhole lid main body by means of a hinge, the inspection window lid can be easily opened and closed by the hinge.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a usage state of a manhole cover with an inspection window according to a first embodiment of the present invention in a manhole.

FIG. 2 is a plan view of the manhole cover of the first embodiment.

FIG. 3 is an enlarged vertical sectional view of the manhole cover of the first embodiment in a mounted state.

FIG. 4 is an enlarged vertical sectional view showing a mounted state of a manhole cover of the second embodiment.

FIG. 5 is a vertical cross-sectional view showing a usage state of a conventional manhole cover with an inspection window in a manhole.

FIG. 6 is a plan view of a conventional manhole cover.

[Explanation of symbols]

 1 Ground 2 Manhole 2A Entrance 3 Concrete wall 4 Equipment 5 Mounting frame 6 Recess 7 Manhole cover 7A Recess 8 Bolt through hole 9 Bolt 10 Manhole cover main body 11 Inspection window 12 Inspection window cover 13 Recess 14 Bolt 14a Head 15 Recess 16 Cap 17 pin

Claims (3)

[Claims] 1. A manhole cover main body is provided with an inspection window,
A manhole cover with an inspection window, wherein the inspection window is closed by an inspection window cover so that it can be opened and closed. 2. An inspection window is provided on the main body of the manhole cover,
A manhole cover with an inspection window, wherein an inspection window cover that closes the inspection window is arranged, and the inspection window cover is fixed to the manhole cover body with a plurality of bolts. 3. A manhole cover main body is provided with an inspection window,
An inspection window lid for closing the inspection window is arranged on the inspection window, and a part of the peripheral edge of the inspection window lid is attached to the manhole lid main body by a hinge so that the other portion of the inspection window lid is bolted. The manhole cover with inspection window, which is fixed to the manhole cover body.