JPS6019162Y2 - manhole - Google Patents

Description

[Detailed description of the invention] This invention allows the lid and the receiving frame to remain in a suitable relationship for a long time.
The present invention relates to a manhole having a structure that allows the lid to be opened and closed without any problem even after long-term use.

The structure of the fitting part between the receiving frame and the cover of a conventional manhole consists of a receiving part with an inclined circumferential inner surface that widens toward the upper opening, and a shelf part protruding toward the center at the bottom of this receiving part. The fitting part of the manhole cover, which has an upwardly expanding slanted circumferential outer surface, is fitted into the cover receiving part of the receiving frame, and the lower part of the fitting part of the cover and the receiving frame are connected to prevent the cover from rattling. A slight interlayer was formed between the shelf and the shelf.

However, over a long period of time, manholes are subjected to downward pressure due to heavy vehicles passing over the cover, and the fitting part of the cover gradually bites into the cover receiving part of the receiving frame, causing the cover to sink into the receiving frame. It becomes a shape that is crowded.

That is, for example, due to its shape, the fitting portion of the lid will bite into the lid receiving portion of the receiving frame like a wedge.

Since the fit between the lid and the receiving frame is tight, a large amount of force is required to open and close the lid, making it inconvenient to open and close the lid.

Then, as time passes, it becomes difficult to open the lid, so it is necessary to replace it with a new manhole before that happens. However, in conventional manholes, the lid receiving part of the receiving frame is formed with a single sloping surface. The fitting part of the lid that fits into this is also formed with a single sloping surface to match the lid receiving part, so the speed at which the fitting part of the lid bites into the receiving frame of the lid receiving part and sinks is relatively fast. As a result, the fit between the lid and the receiving frame tends to become tight in a relatively short period of time, making it difficult to open and close the lid, which has the disadvantage of shortening the useful life of the manhole.

The present invention solves the above-mentioned drawbacks, and provides an economical manhole with a long service life that maintains a suitable fitting relationship between the lid and the receiving frame for a long time, and has no trouble opening and closing the lid even after long-term use. The purpose is to provide

That is, in the manhole of the present invention, two steeply inclined receiving parts are formed in the lid receiving part of the receiving frame with a gently inclined receiving part in between, and correspondingly, the fitting part of the lid is also provided with a gently inclined fitting part in between. to form two steeply inclined fitting parts, and in the initial state of attachment between the receiving frame and the lid, fit the two steeply inclined fitting parts to the two steeply inclined receiving parts to form two inclined fittings. The lower end of the fitting part and the shelf of the lid receiving part at the bottom of these inclined fitting parts, and forming a fitting part, and between the gently inclined receiving part and the gently inclined fitting part in the middle of these inclined fitting parts, and the lower end of the fitting part below these inclined fitting parts. It is characterized by forming gaps of different sizes between the fitting part of the lid and the lid receiving part of the receiving frame. By controlling the sinking of the lid between the part and the gently sloped fitting part and delaying it, the fitting relationship between the lid and the receiving frame is maintained for a longer period of time compared to conventional manholes, which prevents the opening and closing of the lid from becoming a hindrance. This prolongs the period until it appears.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross-sectional view of a manhole. Reference numeral 1 indicates a receiving frame of the manhole, and a lid receiving part 2 is formed in the upper part of this receiving frame 1. This lid receiving part 2 has a lid having a fitting part 4. 3 is fitted.

The structures of the lid receiving portion 2 of the receiving frame 1 and the fitting portion 4 of the lid 3 will be further described in detail with reference to the enlarged cross-sectional view of FIG.

First, an upper steeply sloped receiving part 5, a gently sloped receiving part 6, and a lower steeply sloped receiving part 7 are successively formed on the inside of the lid receiving part 2 of the receiving frame 1 in order from above. A shelf portion 8 is formed at the bottom of the portion 7.

On the other hand, on the outside of the fitting part 4 of the lid 3, an upper steeply inclined fitting part 9, a gently inclined fitting part 10, and a lower steeply inclined fitting part 11 are connected in correspondence with the lid receiving part 2. to form.

As shown in FIG. 3, in the initial state where the lid 3 is fitted to the receiving frame 1, the upper steeply inclined receiving portion 5 of the lid receiving portion 2 of the receiving frame 1 is
and the lower steeply inclined receiving part 7 are fitted into the upper steeply inclined fitting part 9 and the lower steeply inclined fitting part 11 of the fitting part 4 of the lid 3, respectively, and the gently inclined receiving part 6 of the lid receiving part 2 is fitted. and the gently inclined fitting part 1 of the fitting part 4
A first gap 12 with a dimension a is formed between the fitting part 4 and the shelf part 8 of the lid receiving part 2. This forms a second gap 13.

In a manhole with such a configuration, the fitting state between the lid 3 and the receiving frame 1 is as shown in FIG. It gradually digs into and sinks.

To explain this process, the upper steeply inclined fitting part 9 and the lower steeply inclined fitting part 11 of the fitting part 4 of the lid 3 are connected to the upper steeply inclined fitting part 5 and the lower steeply inclined fitting part 5 of the lid receiving part 2 of the receiving frame 1. 7, and this sinking continues until the gently inclined fitting part 10 of the fitting part 4 of the lid 3 hits the gently inclined receiving part 6 of the lid receiving part 2 of the receiving frame 1, that is,
This continues until the dimension a of the first gap 12 becomes O.

In this state, the fit of the lid 1 is not yet very tight, so there is no problem in opening and closing the lid 1.

Assuming that the settling of the lid 1 until the first gap 12 is closed is the first stage of settling, after the first stage of settling is completed, the gently inclined receiving part 6 of the lid receiving part 2 of the receiving frame 1 is closed. Because it supports 3,
The sinking of the lid 3 stops for a while, or its sinking speed becomes significantly slow.

Then, as a further period of time passes, the gently inclined fitting part 10 of the fitting part 4 of the lid 3 or the gently inclined receiving part 6 of the lid receiving part 2 of the receiving frame 1 collapses, and the lid 3 shifts to the second subsidence stage. It turns out.

At the beginning of this second subsidence stage, the dimension of the second gap 13 formed between the lower end 4a of the fitting part 4 of the lid 3 and the shelf part 8 of the lid receiving part 2 of the receiving frame 1 is the same as the initial dimension. b decreases from b to b-a, so until b-a of this second gap 13 becomes O, that is, until the lower end 4a of the fitting part 4 hits the shelf part 8 of the lid holder part 2. A second subsidence phase of M3 will follow.

At the end of this second subsidence stage, the fit between the lid 3 and the receiving frame 1 has already become quite tight, and eventually it becomes difficult to open and close the lid 3, and it is necessary to replace the lid and receiving frame with a new one.

As described above, the manhole of the present invention configured as claimed in the utility model registration claim has a stage in which the sinking of the lid 3 is delayed between the first stage of sinking of the lid 3 with respect to the receiving frame 1 and the second stage of sinking. is formed, so that the appropriate fitting relationship between the lid 3 and the receiving frame 1 is maintained for a longer period of time than in conventional manholes, and
Even after long-term use, there is no problem in opening and closing the lid 1, making it possible to extend its service life.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, with Fig. 1 being an overall sectional view of the manhole, and Fig. 2 being an enlarged sectional view of the main parts thereof.
FIG. 3 is an enlarged sectional view of the main parts fitted together. 1... Receiving frame, 2... Lid holder, 3...
... Lid, 4 ... Fitting part, 5 ... Upper steep slope receiving part, 6 ... Gentle slope receiving part, 7 ...
・Lower steep slope receiving part, 8... Shelf part, 9...
・Upper steeply sloped fitting part, 10... Gently sloped fitting part,
11... Lower steeply inclined fitting part, 12...
First gap, 13... Second gap.

Claims (1)

[Scope of utility model registration request] In the lid receiving part 2 of the receiving frame 1 and the fitting part 4 of the lid 3 that fits into this lid receiving part 2, an upper steeply sloped receiving part 5, a gently sloped receiving part 6, and a lower part are arranged inside the lid receiving part 2. A steeply inclined receiving part 7 is formed continuously, and a shelf part 8 is formed at the bottom of this lower steeply inclined receiving part 7.
An upper steeply inclined fitting part 9, a gently inclined fitting part 10, and a lower steeply inclined fitting part 11 are continuously formed on the outside of the fitting part 4, and the upper part of the fitting part 4 is The steeply inclined fitting part 9 and the lower steeply inclined fitting part 11 are respectively fitted into the upper steeply inclined receiving part 5 and the lower steeply inclined receiving part 7 of the lid receiving part 2, and the fitting part 4 is fitted with a gentle inclined fitting. A first gap 12 is formed between the fitting portion 10 and the gently inclined receiving portion 6 of the lid receiving portion 2, and a first gap 12 is formed between the lower end portion 4a of the fitting portion 4 and the shelf portion 8 of the lid receiving portion 2. A manhole characterized in that a second gap 13 is formed which is slightly larger than the first gap 12.