JP5337007B2 - Manhole cover - Google Patents

Description

The present invention relates to a manhole cover that is used to close a riser that rises from the ground buried in the ground.

2. Description of the Related Art Conventionally, a manhole cover that closes a riser that rises from rainwater or drainage buried in the ground is well known. Further, in order to prevent the lid from blowing off when cleaning the sewage pipe using a jet air jet, the lid is composed of a lid body provided with an exhaust hole and a covering member for closing the exhaust hole. A device in which the cover member is raised by the air pressure during cleaning to open the exhaust hole has been proposed (see Patent Document 1). In addition, in order to avoid the manhole blowing off from the opening of the manhole due to an increase in the internal pressure of the pipe that occurs when the water increases due to heavy rain, etc., the upper lid that covers the upper surface of the bottom lid is vertically The thing which attached so that movement was possible was already proposed (refer patent document 2).

Japanese Utility Model Publication No. 6-20585 JP-A-9-137461

However, in the above-described conventional configuration, when a pedestrian or the like steps on the covering member or the upper lid, the covering member or the upper lid rotates unexpectedly with respect to the lid body or the bottom lid, causing the pedestrian or the like to fall. There was a fear.
Then, an object of this invention is to provide the manhole cover which can solve the said problem.

The present invention has been made to solve the above-described problems, and a lid body in which one or a plurality of vent holes penetrating vertically are provided in the center portion, and a valve body to be deposited on the lid body A plurality of operating shafts are inserted from the lower surface of the valve body, and the operating shafts are inserted into shaft holes provided in the lid body so as to be vertically slidable. It is possible to move up and down with respect to the lid body, and the lower surface of the valve body closes the vent hole at the lowest position of the valve body, and when the valve body rises from the lowest position, the valve body is separated from the lid body. A manhole cover is provided .

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In the above configuration, the valve body is in the lowest position during normal operation. When the internal pressure of the pipe connected to the lid body increases, the valve body rises with respect to the lid body by the internal pressure, and the valve body and the lid body are separated. Then, the vent hole is opened, and the inside of the pipe communicates with the outside through the vent hole of the lid body and the space formed between the valve body and the lid body. Is released to the outside world. Furthermore, since digits plurality set the operating shaft, the valve body is unable to rotate about the central axis relative to the lid body. Thus, even when a pedestrian or the like steps on the valve body, the valve body does not rotate unexpectedly and is safe.

Further, the area of the exhaust port formed along the outer peripheral edge of the valve body between the separated valve body and the lid body is larger than the total opening area of the vent holes of the lid body. A configuration in which the operating shaft length of the valve body is set is desirable.

With this configuration, when the internal pressure of the pipe connected to the lid body increases, the valve body is separated from the lid body by an appropriate distance, so that the pressure in the pipe is smoothly released to the outside.

The central portion of the lid main body is provided with a high step portion set higher than the periphery of the lid main body, the vent hole is disposed in the high step portion, and the upper surface of the high step portion. An annular packing is disposed so as to surround the vent hole, and when the valve body that can move up and down is at the lowest position, the packing is provided between the high step portion of the lid body and the valve body. It is desirable that the lower surface of the valve body closes the vent hole.

In addition, a peripheral wall portion that is set higher than the periphery of the lid body is annularly provided in the central portion of the lid body, and the vent hole is disposed in a region inside the peripheral wall portion. An annular packing is disposed on the upper surface of the peripheral wall portion of the main body so as to surround the vent hole, and when the valve body that can move up and down is in the lowest position, the peripheral wall portion of the lid main body and the valve body It is desirable that the packing be interposed between the two and the lower surface of the valve body close the vent hole.

By providing the high step portion or the peripheral wall portion as described above and arranging the packing between the high step portion and the valve body or between the peripheral wall portion and the valve body, first, the lid body and the valve body Odors in the piping will not leak to the outside from between. Secondly, the packing is disposed at a high position with respect to the ground surface, so that the packing is not soaked in rain water flowing on the ground surface during rainy weather, and earth and sand are not attached. In this way, it is possible to avoid soil or sand biting between the valve body and the packing at normal times, and proper adhesion is always ensured between the valve body and the lid body. Can be prevented. Thirdly, in order to prevent rainwater from entering the pipe through the vents, the high step portion or the peripheral wall blocks the rainwater on the ground surface. There is no problem that the processing capacity is saturated and sewage is ejected from the domestic drainage facilities.

In addition, when the valve body is in the lowest position, it is desirable that the lower surface of the valve body is in surface contact with the upper surface of the lid body at a portion other than the vent hole.

With such a configuration, the valve body is more securely fixed to the lid main body at normal times, and the strength of the entire manhole cover is increased.

Furthermore, it is desirable that the upper surface of the lid body from the high step portion or the peripheral wall portion to the peripheral edge is an inclined surface that descends toward the peripheral edge.

With such a configuration, even if rainwater including earth and sand enters the upper surface of the lid body, the rainwater flows toward the ground surface along the inclined surface, so that earth and sand remain on the upper surface. Can be prevented. Therefore, when the valve body is at the lowermost position, it is possible to prevent the sand and the like from being bitten between the valve body and the lid body to create a gap, and the odor leaks from there. .

The manhole cover of the present invention can release the internal pressure of the pipe and is safe for pedestrians and the like because the valve body does not rotate with respect to the cover body.

The partial notch top view of the manhole cover which concerns on a 1st Example. It is the sectional view on the AA line of FIG. 1a, a) shows normal time, b) shows the time of pressure release. (a) is explanatory drawing which shows the area X of the exhaust port formed between the valve body and lid body which were opened apart, and b) is explanatory drawing which shows the total opening area Y of the vent hole of a lid main body. It is sectional drawing of the manhole cover concerning a 2nd Example, a) shows a normal time, b) shows the time of pressure release. It is sectional drawing of the manhole cover concerning a 3rd Example, a) shows normal time, b) shows the time of pressure release. It is sectional drawing of the manhole cover which concerns on 4th Example, a) shows normal time, b) shows the time of pressure release.

  Hereinafter, embodiments of the manhole cover according to the present invention will be described with reference to the accompanying drawings.

<First Example>
As shown in FIGS. 1 and 2, the manhole cover 1A according to the first embodiment includes a substantially disc-shaped lid body 5A and a substantially disc-shaped valve body 2A attached on the lid body 5A. Become.

When the construction of the manhole cover 1A as shown in FIG. 2a is completed, the cover body 5A is a cover that is attached to the upper end of the riser 41 that rises from rainwater or drainage (not shown) embedded in the ground. It is stored in the frame 40, and the upper end edge of the lid frame 40, that is, the peripheral edge of the lid body 5A is arranged to coincide with the ground surface GL.
The lid frame 40 and the lid body 5A are connected to each other by a metallic chain (not shown) in the lid frame 40, and between the lid frame 40 and the lid body 5A, A packing ring 11 provided around the lower outer periphery of the lid main body 5A is interposed to prevent the odor in the rising pipe 41 from leaking to the outside.

Further, a high step portion 6 that is set higher than the peripheral edge of the lid main body 5A (that is, the ground surface GL) is provided at the center of the lid main body 5A. Specifically, the height h of the high step portion 6 (FIG. 2).
b) is set to be 10 mm from the periphery of the lid body 5A, that is, from the ground surface GL. Furthermore, the upper surface 15 from the high step portion 6 to the peripheral edge of the lid body 5A is an inclined surface that descends toward the peripheral edge.

Furthermore, the ventilating hole 7 penetrating vertically is provided in the high step part 6. An annular packing 10 is disposed on the upper surface of the high step portion 6 so as to surround the vent hole 7. A so-called water stop surface 16 is constituted by a horizontal plane including the upper edge of the packing 10.

In addition, at the center of the lid body 5A, there are four (two or more) shaft holes 8A penetrating vertically.
, 8A, 8A, 8A are arranged, and four (two or more) operating shafts 3A, 3A are inserted into the shaft holes 8A, 8A, 8A, 8A from the center of the lower surface of the valve body 2A. , 3A, 3A are slidably inserted vertically. When each operating shaft 3A rises in each shaft hole 8A, the valve body 2A is separated from the lid body 5A (see FIG. 2b). At the lower end of each operating shaft 3A,
A stopper portion 4 having a diameter larger than the outer diameter of the operating shaft 3A is provided, and the operating shaft 3A can be raised to a position where the stopper portion 4 contacts the lower end edge of the shaft hole 8A.

As described above, the valve body 2A moves up and down with respect to the lid frame body 5A as the operating shafts 3A, 3A, 3A, and 3A slide up and down, but the valve body 2A is normally in the lowest position α. (See Figure 2a)
In the lowest position α, the lower surface 22 of the valve body 2A is in surface contact with the upper surface 15 of the lid body 5A at a portion other than the vent hole 7. Further, a packing 10 is interposed between the lower surface 22 of the valve body 2A at the lowest position α and the upper surface of the high step portion 6, and the lower surface 22 closes the upper end of the vent hole 7 in this state. Yes. For this reason, the odor in the rising pipe 41 does not leak to the outside from between the valve body 2A and the lid body 5A.

When the internal pressure P of the rising pipe 41 connected to the lid body 5A is increased due to heavy rain or the like in the above configuration, as shown in FIG. 2b, the valve body attached to the lid body 5A 2A rises with respect to the lid body 5A by the internal pressure, and the valve body 2A and the lid body 5A are separated. In this way, when the valve body 2A is in the separation position β, the vent hole 7 is opened, and the vent hole 7 of the lid body 5A, the space between the valve body 2A and the lid body 5A, and the outside world are respectively provided. The pressure in the rising pipe 41 is released to the outside through the communication path.

Further, the manhole cover 1A is provided with a plurality of operating shafts 3A and shaft holes 8A in the valve body 2A, and the valve body 2A does not rotate around the central axis CL with respect to the cover body 5A. However, when the valve body 2A is stepped on, it does not rotate unexpectedly and is safe.

Further, in the manhole cover 1A, a high step portion 6 is set on the cover main body 5A, and the high step portion 6A is set.
Since the packing 10 is arranged on the upper surface of the metal and the packing 10 is set higher than the ground surface GL by the height h, earth and sand flowing on the ground surface GL will not adhere to the packing 10 and the Sediment or the like does not bite between the body 2A and the packing 10. Also,
Since the high step portion 6 blocks the rainwater on the ground surface GL and prevents the rainwater from entering the vent hole 7 from the water blocking surface 16, the processing capacity of the pipe does not decrease even in the case of heavy rain.

Further, since the upper surface 15 from the high step portion 6 to the peripheral edge of the lid main body 5A is an inclined surface that descends toward the peripheral edge, even if rainwater including earth and sand enters the upper surface 15, Rainwater does not flow toward the ground surface GL, and no earth or sand remains on the upper surface 15. Thus, the adhesion between the valve body 2A and the lid body 5A can be reliably ensured, and odor leakage does not occur during normal times.

Furthermore, the manhole cover 1A is in surface contact between the valve body 2A and the lid body 5A at a portion other than the vent hole 7 at the normal time, that is, when the valve body 2A is at the lowest position α (see FIG. 2a). Therefore, the valve body 2A is securely fixed to the lid body 5A, and sufficient strength is secured as the whole manhole cover 1A.

The length of the operating shaft 3A of the valve body 2A is set under the following conditions. That is, in the state where the valve body 2A and the lid body 5A are separated from each other, a vertical direction is formed between the valve body 2A and the lid body 5A along the outer peripheral edge of the valve body 2A. Area X of exhaust port 20 along
(See FIG. 3a) is larger than the total opening area Y of the vent holes 7 of the lid main body 5A (in this embodiment, the total opening area of the four vent holes 7, see FIG. 3b). The valve body 2A
The length of the operating shaft 3 is set. With this configuration, even if the internal pressure of the riser pipe 41 connected to the lid body 5A increases, the operating shaft 3A rises by an appropriate distance and the valve body 2A and the lid body 5A.
Are separated from each other with a sufficient distance, and the pressure in the riser 41 is smoothly released to the outside.

In addition, since the upper surface 21 of the valve body 2A is an inclined surface that descends toward the peripheral edge, there is no possibility that a pedestrian or the like will fall by being caught on the manhole cover 1A.

<Second Example>
A manhole cover 1B according to the second embodiment will be described with reference to FIG. The description of the parts common to the first embodiment shown in FIGS.

The manhole cover 1B is composed of a valve body 2B and a cover body 5B. The lid body 5
A peripheral wall portion 36 that is set higher than the peripheral edge of the lid main body 5B (that is, the ground surface GL) is annularly provided in the central portion of B. Further, an annular packing 10 is disposed on the upper surface of the peripheral wall portion 36 so as to surround the vent hole 7. The upper surface 1 of the lid body 5B
Reference numeral 5 denotes a horizontal plane having the same height as the ground surface GL.

Further, a vent hole 7 is provided in a region inside the peripheral wall portion 36. The valve body 2
A stopper portion 31 having a diameter larger than the outer diameter of the operating shaft 3A is provided at each lower end portion of the four operating shafts 3A, 3A, 3A, 3A of B.

4a, at the lowest position α of the valve body 2B, the lower surface 22 of the valve body 2B is in surface contact with the upper surface 15 of the lid body 5B at a portion other than the vent hole 7, and the peripheral wall The packing 10 on the upper surface of the portion 36 is interposed between the valve body 2B and the lid body 5B, and the vent hole 7 is closed.

In the above configuration, when the internal pressure P of the riser pipe 41 increases, as shown in FIG.
Rises, and the valve body 2B and the lid body 5B are separated from each other. Then, the vent hole 7 of the lid body 5B, the space between the valve body 2B and the lid body 5B, and the outside world communicate with each other, and the pressure in the riser pipe 41 is transferred to the outside world through the communicating path. Opened.

Further, in this embodiment, the peripheral wall portion 36 is set on the lid body 5B, the packing 10 is disposed on the upper surface of the peripheral wall portion 36, and the packing 10 is set higher than the ground surface GL. The flowing earth and sand will not adhere to the packing 10, and the earth and sand will not bite between the valve body 2B and the packing 10 to cause odor leakage. Further, since the peripheral wall portion 36 blocks the rainwater on the ground surface GL and prevents the rainwater from entering the vent hole 7 from the water blocking surface 16, the processing capacity of the pipe does not decrease even in the case of heavy rain.

<Third embodiment>
A manhole cover 1C according to a third embodiment will be described with reference to FIG. The description of the parts common to the first embodiment shown in FIGS. 1 and 2 or the second embodiment shown in FIG. 4 is omitted.
The manhole cover 1C includes a valve body 2C and a cover body 5C. Further, the upper surface 21 of the valve body 2C is a horizontal surface, and an annular projection 23 extending downward is formed on the periphery. As shown in FIG. 5a, at the lowest position α of the valve body 2C, the lower end of the annular projection 23 of the valve body 2C abuts the ground surface GL, and the center of the lower surface of the valve body 2C is the lid Body 5C
The upper end of the vent hole 7 is closed in surface contact with the upper surface of the high step portion 6.

In the above configuration, when the internal pressure P of the rising pipe 41 increases, as shown in FIG.
And the lid body 5C are separated from each other, and the lower end of the annular protrusion 23 is separated from the ground surface GL, whereby the vent hole 7 of the lid body 5C and the space between the valve body 2C and the lid body 5C, Communicate with the outside world.
Then, the pressure in the rising pipe 41 is released to the outside through the communication path.

<Fourth embodiment>
A manhole cover 1D according to a fourth embodiment will be described with reference to FIG. The description of parts common to the first embodiment shown in FIGS. 1 and 2, the second embodiment shown in FIG. 4, or the third embodiment shown in FIG. 5 is omitted.
The manhole cover 1D includes a valve body 2D and a cover body 5D, and the cover body 5D includes a high step portion 6D.
Or the surrounding wall part 36 is not provided. Even in such a configuration, the valve body 2D is provided with the lid body 5D.
The lower surface 22 of the valve body 2D closes the vent hole 7 at the lowermost position α (see FIG. 6a) of the valve body 2D, and the valve body 2D is in the lowermost position. When raised from α, the lid body 5
Separate from D (see FIG. 6b).

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The present invention is not limited to the form of the first embodiment to the fourth embodiment, and can be appropriately changed without departing from the gist of the present invention. For example, the height h from the ground surface GL in the high step part 6 or the peripheral wall part 36 can be set as appropriate, but it is set to 10 mm or more in consideration of the function of preventing adhesion of earth and sand or rainwater intrusion as described above. preferable. Also, for example, the valve body 2A ~
The planar shape of 2 D and a lid body 5A～5 D can be appropriately changed. Moreover, valve body 2A- 2D
The actuating shaft 3A~3 length of D in can be appropriately set according to the installation environment. Further, the stopper portion 4 and 31 provided on the operating shaft 3A～3 D may be be the operating shaft 3A～3 D integrally formed may be constructed as separate parts.

INDUSTRIAL APPLICABILITY The present invention is a manhole cover that can release pressure properly even when the internal pressure of the pipe increases, and is safe for pedestrians and the like, and can be used industrially.

1A~1 area D manhole cover 2A～2 D valve 3A～3 D actuating shaft 5A～5 D lid body 6 high-stage section 7 vent 8A～8 D shaft hole 10 packing 20 outlet 36 peripheral wall portion X outlet Y Total opening area of vent

Claims (6)

A lid body in which one or a plurality of vent holes penetrating vertically are provided in the central portion;
A manhole cover comprising a valve body deposited on the cover body,
A plurality of operating shafts are inserted from the lower surface of the valve body, and the valve body can be moved up and down relative to the lid body by inserting the operating shafts into shaft holes provided in the lid body so as to be slidable vertically. age,
A manhole cover, wherein the lower surface of the valve body closes the vent hole at the lowest position of the valve body, and the valve body is separated from the lid body when the valve body is lifted from the lowest position. The valve body such that the area of the exhaust port formed along the outer peripheral edge of the valve body between the separated valve body and the lid body is larger than the total opening area of the vent holes of the lid body. The manhole cover according to claim 1 , wherein the operating shaft length is set. In the center of the lid main body, a high step portion set higher than the periphery of the lid main body is provided, and the vent hole is disposed in the high step portion, and on the upper surface of the high step portion. An annular packing is arranged to surround the vent;
When the vertically movable valve body is in the lowest position, the packing is interposed between the upper step portion of the lid body and the valve body, and the lower surface of the valve body closes the vent hole. The manhole cover according to claim 1 or claim 2 . The central part of the lid main body is annularly provided with a peripheral wall part set higher than the peripheral edge of the lid main body, and the vent hole is disposed in a region inside the peripheral wall part. An annular packing is arranged on the upper surface of the peripheral wall portion so as to surround the vent hole,
When the vertically movable valve body is in the lowest position, the packing is interposed between the peripheral wall portion of the lid body and the valve body, and the lower surface of the valve body closes the vent hole. The manhole cover according to claim 1 or claim 2 . If the valve body is in the lowermost position, the lower surface of the valve body relative to the lid body top surface, any one of claims 1 to 4 is in surface contact with a portion other than the vent hole The manhole cover described in 1. The upper surface of the high stage portion or the peripheral wall of the lid body to the periphery, manhole covers according to any one of the inclined surfaces and has been and claims 3 to 5 which descends towards the circumferential edge.