JP4083328B2 - Manhole cover splash prevention device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manhole cover splash prevention device that can cope with rapid fluctuations in air pressure and water pressure in a pipe rod.
[0002]
[Prior art]
Conventionally, as this type, there are those shown in FIGS. 4 and 5 shown in Japanese Utility Model Application Publication No. 62-5102.
[0003]
To explain with reference to FIGS. 4 and 5, opened on the bottom plate 5 of the inner cover 4 which is a container-like and an exhaust port 6 and inlet port 8, together with the manhole cover 2 manhole receiving frame 1, is attached by a clamp 15 In the case of the inner lid 4, when the pressure inside the pipe becomes high due to an excessive amount of inflowing water, etc., the exhaust blocking plate 7 that has closed the exhaust port 6 of the bottom plate 5 of the inner lid 4 by its own weight is attached to the rotating rod 10. Since the exhaust port 6 is opened by being pivoted upward as the center, the air flows into the inner lid 4 from the exhaust port 6 and is discharged into the atmosphere from the exhaust hole 3 of the manhole cover 2. When the pressure difference between the inside and outside becomes small, the exhaust closing plate 7 rotates downward due to its own weight, and closes the exhaust port 6 again. Reference numeral 13 denotes a handle used when the inner lid 4 is attached / removed.
[0004]
In addition, when the pressure inside the pipe becomes negative and the flow of water becomes worse, the outside air flows into the inner lid 4 from the exhaust hole 3 of the manhole cover 2 and moves downward through the intake port 8 of the bottom plate 5 of the inner lid 4. The intake air blocking plate 9 that has been closed from above is rotated downward about the rotation rod 11 while the intake port 8 of the bottom plate 5 is opened and flows into the tube. When the pressure difference between the inside and the outside becomes small, it is turned upward by the force of the weight 12 to close the intake port 8 again.
[0005]
Although rainwater flows in from the exhaust hole 3 of the manhole cover 2, the rainwater that flows in flows in the same way from the intake port 8 into the pipe while pushing down the intake blocking plate 9.
[0006]
Furthermore, since the intake port 8 and the exhaust port 6 opened in the bottom plate 5 of the inner lid 4 are normally closed by the two closing plates 7 and 9, the odor in the tube does not leak to the outside.
[0007]
[Problems to be solved by the invention]
However, in recent years, the development of residential land has also progressed on steep slopes, and sudden changes in air pressure are likely to occur in the pipes provided there. In addition, in the conventional manhole cover scattering prevention device 18, the bottom plate 5 and the exhaust port are provided. The area ratio with respect to 7 did not reach 20%, and there was a problem that exhaust was not always performed smoothly.
[0008]
Further, the bottom plate 5 has to have a high-strength structure facing the impact of the exhaust, and there is a problem that the manhole cover scattering prevention device 18 becomes expensive.
[0009]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an inexpensive manhole cover splash prevention device without exhaust gas flowing smoothly and having a high strength structure.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, in the invention described in claim 1, a cylindrical body having a flange that is open at the top and projects in a flange shape from the top is formed, and the cylindrical body is suspended by the flange. The manhole cover is inserted into a manhole receiving frame, a manhole cover is placed on the manhole cover, and the manhole cover scattering prevention device provided on the cylindrical body is assembled integrally through a clamp,
One or more exhaust ports are provided in the lower surface portion of the cylindrical body, and an exhaust portion in which an exhaust door that always closes each exhaust port is rotatably attached, and an inclined wall and an upper surface are provided from the lower surface portion. An enclosure portion is formed, an intake port that opens in the inclined wall is provided, and an intake portion that is rotatably attached to an intake door that normally closes the intake port is provided.
[0011]
In such a case, the cylindrical body has both an exhaust part and an intake part, and is closed at all times to prevent odors and noise, and at the same time, even if the water pressure and air pressure in the manhole rises abnormally, Even if the flow of running water deteriorates due to decompression, it is possible to cope with both.
[0012]
The invention described in claim 2 is the manhole cover scattering prevention device according to claim 1,
A rotating shaft is assembled so as to bridge the lower center of the cylindrical body, a hinge portion is provided with an exhaust door having a predetermined width along the rotating shaft, and openings provided on both outer sides of the exhaust door A slant wall is provided from each edge, an enclosure is formed by the upper surface connected to the upper side of the slant wall and the cylindrical body, and an air intake door is provided on the slant wall via a hinge.
[0013]
In such a case, since the intake / exhaust door is separately rotated and opened / closed by the hinge portion, it operates without interference.
[0014]
The invention described in claim 3 is the manhole cover scattering prevention device according to claim 1,
An enclosure portion having a slant wall is located at a central portion of the lower surface portion of the cylindrical body, the intake door for always closing the intake port provided in the slant wall is provided, and the surrounding portion and the upper surface of the enclosure portion are provided with the intake door. An exhaust door is provided.
[0015]
In such a case, a plurality of small exhaust door devices can be provided around the enclosure. Therefore, manufacture becomes easy.
[0023]
According to a fourth aspect of the present invention, there is provided the manhole cover scattering prevention device according to the first aspect, wherein a plurality of the clamps are provided from the back side of the peripheral portion of the manhole cover, and the clamps are arranged on the surface of the manhole cover. The engaging portion of the clamp is provided so as to be able to protrude and retract from the peripheral portion of the manhole cover toward the engaging groove portion provided around the receiving portion of the manhole receiving frame by rotating from the side. Yes.
[0024]
In such a case, the manhole cover can be easily fixed and workability is improved.
[0025]
The invention described in claim 5 is the manhole cover scattering prevention device according to claim 1 , wherein a net-like body is provided so as to cover a lower opening of the cylindrical body.
[0026]
In such a thing, a water hammer can be relieved with a net-like body. Moreover, even if it is damaged, it can be prevented from falling into the tube.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
A manhole cover scattering prevention apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2.
[0028]
FIG. 1 is a partially cut-away plan view showing a manhole cover scattering prevention device. 2 is a cross-sectional view of the main part of FIG.
[0029]
1 and 2, reference numeral 20 denotes a manhole cover scattering prevention device, 21 a manhole cover, 22 a number of exhaust holes provided in the manhole cover 21, and 23 a manhole cover 21 attached to a side lump (not shown). Reference numeral 30 denotes a manhole receiving frame to be connected. Reference numeral 30 denotes a cylindrical body fitted into the manhole receiving frame 23 with a flange 30a. 31 is an exhaust portion, 311 is an exhaust port provided in the lower surface portion 302, 32 is an exhaust door that closes the exhaust port 311 , and this exhaust door 32 is bridged to 30 with a split pin 34a or the like. The hinge 35 is formed by connecting the top 35a of the exhaust door 32 to the rotating shaft 33 having the fixing portions 34 at both ends. Reference numeral 39 denotes a suspension bar, which is provided at an appropriate height by bridging the center of the cylindrical body 30 and is used when attaching and removing the cylindrical body 30. At the same time, the suspension bar 39 abuts when the exhaust door 32 rotates to near the top dead center, and also plays a role of returning to the original position.
[0030]
Reference numeral 36 denotes an intake portion, which opens the lower surface portions 302 on both sides of the exhaust portion 31, and provides inclined walls inwardly from both the openings. The inclined portion and the cylindrical body 30 are closed so as to surround the enclosed portion 36A. Is provided. In addition, an intake port 37 is provided in each inclined wall, and an intake door 38 is provided so as to rotate via a hinge portion 380 so as to cover the intake port 37.
[0031]
The cylindrical body 30 configured in this manner is assembled to the manhole receiving frame 23 and the manhole cover 21 via a plurality of clamps 24 of the manhole cover 21.
[0032]
The clamp 24 provided on the manhole cover 21 used at the time of assembling is attached so as to be fitted in the recess on the back surface side of the manhole cover 21, and rotates around the receiving part of the manhole receiving frame 23 by rotating from the front side. It is set as the structure engaged with the provided engagement groove part 23a.
[0033]
Reference numeral 45 denotes a net-like body that is attached to the lower side of the lower surface portion 302 of the cylindrical body 30. Accordingly, it is possible to prevent the object from falling into the pipe tube and to effectively reduce the water hammer to the intake / exhaust portion.
[0034]
In addition, although the metal net | network 45 can be mainly considered as the net-like body 45, you may use porous materials, such as a mesh plate, in addition to this.
[0035]
Next, the operation of the manhole cover scattering prevention apparatus configured as described above will be described.
[0036]
That is, when the water pressure or air pressure in the manhole rises, or when pressure is applied from below due to sudden rise of the pressurized air staying in the pipe facility, the exhaust door 32 is moved from the hinge portion 35 of the exhaust portion 31 to the arrow. The exhaust port 311 is opened by rotating in the a direction, and exhausted into the atmosphere from the exhaust holes 22 provided in the manhole cover 21 and suddenly decompressed. Therefore, the manhole cover 21 can be prevented from floating and scattering.
[0037]
On the other hand, when the water level in the pipe drops to a negative pressure state and the water flow deteriorates, the intake door 38 is sucked by the pressure difference from the outside air and rotates in the direction of arrow b. Then, the air is sucked from the exhaust hole 22 of the manhole cover 21 and sent into the tube so that the negative pressure is eliminated and the water flow in the tube is improved.
[0038]
If this sudden fluctuation of intake and exhaust is cured, the intake / exhaust doors 32 and 38 both return to their original positions, and the intake / exhaust ports 311 and 37 are closed and sealed as usual. It can be isolated from the inside of the pipe and can also block noise such as odor and running sound in the pipe.
[0039]
(Modification)
FIG. 3 is a cross-sectional view showing a modification of FIG.
[0040]
In FIG. 3, reference numeral 30 denotes a cylinder, and 36 </ b> A denotes an enclosure. The enclosure 36 </ b> A is formed by an inclined wall and an upper surface that are provided so as to be surrounded by the bottom surface 302. ing.
[0041]
As described above, the difference from FIG. 2 is that the enclosure portion 36A is provided in the central portion of the cylindrical body 30. Thus, the exhaust door 321 that covers the exhaust port 311 is replaced with the bottom surface portion around the enclosure portion 36A. 302 and the upper surface of the enclosure 36A, and the intake door 381 is provided on the inclined wall of the enclosure 36A provided in the center so as to open inward, and both the doors 321 and 381 are rotated by the hinge 380. It is provided to do.
[0042]
Since other configurations and operations are the same as those in the first embodiment, the description thereof is omitted.
[0072]
Incidentally, Oite to the first embodiment described above, the material used as the scattering prevention device of manhole cover is a manhole cover and manhole receiving frame is cast iron, tensile strength: using of about 25 MPa, also, the cylindrical body In consideration of rust prevention, stainless steel plates and pipes are used, and the intake / exhaust part may be formed of a resin material such as FRP which is highly impactful and lightweight.
[0073]
【The invention's effect】
As described above, according to the first to third aspects of the present invention, the area ratio of the exhaust port is remarkably increased, the exhaust flows smoothly, and there is no risk of the manhole cover floating and scattering, while at the same time having high strength. The cost could be reduced without having to.
[0074]
In addition, since the inclined wall is provided as the intake portion, a three-dimensional intake area can be secured without interfering with the exhaust portion, and pressure reduction in the pipe can be easily handled.
[0075]
In addition, since a plurality of intake / exhaust doors are provided, even if malfunction occurs, temporary emergency response can be made with other doors. Therefore, safety against scattering is high .
[0079]
According to the invention of claim 4 , since the clamp structure is easy to attach and remove the manhole cover, the number of work steps can be reduced.
[0080]
According to the invention of claim 5 , the water hammer to the intake / exhaust portion can be mitigated by the mesh body, and the apparatus can be protected. In addition, since falling objects can be captured, the flow is not obstructed.
[Brief description of the drawings]
FIG. 1 is a partially cut-away plan view showing a manhole cover scattering prevention device according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of FIG.
FIG. 3 is a cross-sectional view showing a modification of FIG.
FIG. 4 is a plan view with a part cut away showing a manhole cover splash prevention device according to the prior art.
It is a fragmentary cross-sectional view of FIG. 5 FIG.
[Explanation of symbols]
20 ... Manhole cover splash prevention device
30 ... Cylinder
302 ... lower surface part
31 ... exhaust part
311 ... exhaust port
32 ... Exhaust door
36A ... enclosure
36 ... intake part
37 ... Inlet
38 ... Inlet door

Claims (5)

Form a cylinder with a flange that opens at the top and projects from the top in a brim shape.The cylinder is inserted into a manhole receiving frame so that it is suspended by the flange, and a manhole cover is placed on it, and a clamp is attached. A manhole cover anti-scattering device provided on the cylindrical body integrally assembled via,
One or more exhaust ports are provided in the lower surface portion of the cylindrical body, and an exhaust portion in which an exhaust door that always closes each exhaust port is rotatably attached, and an inclined wall and an upper surface are provided from the lower surface portion. An apparatus for preventing scattering of a manhole cover, comprising: an intake portion that is formed with an enclosure portion, an intake port that opens in the inclined wall, and an intake door that is normally closed to the intake port is rotatably attached. .   A rotating shaft is assembled so as to bridge the lower center of the cylindrical body, a hinge portion is provided with an exhaust door having a predetermined width along the rotating shaft, and openings provided on both outer sides of the exhaust door An inclined wall is provided from each edge, an enclosure is formed by an upper surface connected to the upper side of the inclined wall and the cylindrical body, and an intake door is provided on the inclined wall via a hinge portion. The apparatus for preventing scattering of a manhole cover according to 1.   An enclosure portion having a slant wall is positioned at a central portion of the lower surface portion of the cylindrical body, the intake door for always closing the intake port provided in the slant wall is provided, and the periphery of the enclosure portion and the upper surface are provided with the intake door. 2. The apparatus for preventing scattering of a manhole cover according to claim 1, further comprising an exhaust door. A plurality of the clamps are provided from the back side of the peripheral part of the manhole cover, and the clamps are rotated from the front side of the manhole cover, thereby forming an engagement groove provided around the receiving part of the manhole receiving frame. 2. The manhole cover scattering prevention device according to claim 1, wherein an engaging portion of the clamp is provided so as to be able to project and retract from a peripheral portion of the manhole cover. The apparatus for preventing scattering of a manhole cover according to claim 1, wherein a net-like body is provided so as to cover a lower opening of the cylindrical body.

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