JP4801299B2 - Inner lid for manhole insulation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention can effectively block both radiant heat transfer and convective heat transfer to the manhole's heat insulation inner lid, especially the manhole's iron lid, and can surely drain the inflow water into the manhole. The present invention relates to an inner lid for manhole insulation, which has a simple structure and can be manufactured at low cost.
[0002]
[Prior art]
On roads in heavy snowfall, the manhole iron cover of the sewer where warm domestic wastewater flows is hotter than the surroundings, so the snow on the iron cover melts, and as a result, a large iron cover dent is formed on the road surface. When such a dent is formed on the road surface, a problem has arisen in that a vehicle is taken by the dent to cause a traffic accident, or a person is injured by a foot.
[0003]
As a means to solve this problem, a heat insulating material is attached to the back surface of the iron lid, but a hinge or a lock mechanism for connecting the iron lid to the receiving frame is attached to the back surface of the iron lid. Insulation cannot be applied to the entire back surface of the iron lid. Therefore, the heat insulation effect is insufficient, and snow melting cannot be reliably prevented.
[0004]
In order to solve the above problem, Japanese Patent Laid-Open No. 2000-1900 discloses an annular frame body that can be expanded and contracted in a manhole, an outer sealing material provided on the outer periphery of the annular frame body, and the annular frame. A manhole heat insulating device is disclosed that includes a heat insulating closing body supported on the body side so as to be movable up and down, and an elastic body that always presses the heat insulating closing body below the annular frame. Hereinafter, it is referred to as Conventional Technology 1.
[0005]
Japanese Patent Laid-Open No. 2000-129708 includes a support body disposed in a manhole and a plate shape in which at least one notch surface is formed on the outer edge side in contact with the inner surface of the manhole, and is supported by the support body. Disclosed is a heat insulating device for manholes comprising a heat insulating closing member, and a shut-off valve attached to the heat insulating closing member so as to close the space between the inner surface of the manhole and the notch, and opened by a load from above. ing. Hereinafter, it is referred to as Conventional Technology 2.
[0006]
[Problems to be solved by the invention]
However, the prior art 1 uses a special structure support frame for fixing the heat insulating closing body (insulating inner lid) in the manhole and an annular frame body having a freely expandable / contractible diameter, so that the structure is complicated. costly. Moreover, since the said prior art 2 uses the shut-off valve for flowing the water collected on the heat insulation obstruction | occlusion body to the lower sewer, again, a structure is complicated and cost starts.
[0007]
Therefore, an object of the present invention is to effectively block both radiant heat transfer and convective heat transfer to the manhole iron cover, to reliably drain the inflow water into the manhole, and to have a simple structure. Accordingly, an object of the present invention is to provide a manhole heat insulation inner lid that can be manufactured at low cost.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 includes a concave outer lid that is detachably attached to the inner side of the iron lid receiving frame of the manhole, and an inner lid that is detachably attached to the outer lid . The bottom has a shape, an opening is formed in the bottom , the inner lid has a larger area than the opening, and when there is no inflow water into the outer peripheral lid, the opening is formed on the inner lid. When the inner lid is blocked by falling due to its own weight and there is inflow water into the outer lid, the inner lid is lifted by the buoyancy of the inner lid and the opening is opened, thus the inflow water in the outer lid. Is characterized by being drained into the manhole from the opening.
[0009]
The invention according to claim 2 is characterized in that the inner lid is attached to the outer peripheral lid via a guide rod, and the guide rod floats together with the inner lid and acts as a weight of the inner lid. It is what you have.
[0010]
The invention according to claim 3 is characterized in that the outer peripheral cover is covered with a heat insulating material, and the inner cover is formed of a heat insulating material.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of an inner lid for insulating a manhole according to the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a partial cross-sectional view showing the installation state of the heat insulating inner lid of the present invention, FIG. 2 is a partial cross sectional view of the heat insulating inner cover of the present invention showing the state where the inner cover is lifted by buoyancy, and FIG. It is a fragmentary sectional view which shows the installation state of the inner lid | cover for heat insulation of this invention to another manhole.
[0013]
In FIG. 1 to FIG. 3, 1 is a manhole, 2 is a receiving frame, 3 is an iron lid fitted into the receiving frame 2, and 4 is a ring-shaped mounting frame having an L-shaped cross section. The peripheral surface is fixed with bolts 5. Reference numeral 6 denotes an outer peripheral lid having a concave circular shape , that is, a cylindrical shape having a bottom portion . The flange portion 6 </ b> A is mounted on the mounting frame 4 and is attached to the receiving frame 2. The outer lid 6 is made of a strong material such as metal or FRP so as not to be broken even if a person accidentally rides it. A circular opening 6B is formed at the center of the bottom of the outer lid 6, and the outer surface of the outer lid 6 is covered with a heat insulating material 10 such as urethane foam.
[0014]
A circular inner lid 7 is attached to the outer lid 6 via a guide bar 8 so as to be movable up and down. The inner lid 7 has a size capable of closing the opening 6 </ b> B of the outer peripheral lid 6. The guide bar 8 has an inverted U-shape, and stoppers 9 are attached to both ends thereof so that the guide bar 8 does not come out of the outer lid 6. Since the guide bar 8 penetrates loosely with respect to the outer cover 6, the inner cover 7 is in close contact with the outer cover 6 by its own weight and closes the opening 6 </ b> B in the normal state. When rainwater or the like flows into the tank, it floats by buoyancy, opens the opening 6B, and discharges rainwater in the outer lid 6 into the manhole 1. The reason for applying the weight of the guide rod 8 to the inner lid 7 is that the inner lid 7 is prevented from becoming unstable due to fluctuations in the internal pressure of the manhole 1 due to a change in the flow rate of the sewer, and the inflow water into the outer lid 6 is drained. This is because the inner lid 7 is quickly lowered after being done.
[0015]
According to the heat insulating inner lid of the present invention configured as described above, both radiant heat transfer and convective heat transfer to the iron cover of the manhole can be effectively blocked as follows, and the manhole Rainwater can be reliably drained into the interior.
[0016]
If the outer lid 6 is placed on the mounting frame 4 fixed to the receiving frame 2 together with the inner lid 7, radiant heat transfer and convective heat transfer in the manhole 1 are reliably blocked by the outer lid 6 and the inner lid 7. In particular, the outer surface of the outer lid 6 is covered with the heat insulating material 10 and the inner lid 7 is made of a heat insulating material, so that the heat insulating effect is very high. In this state, since the weight of the guide rod 8 is applied to the outer lid 6, there is no possibility that the inner lid 7 becomes unstable due to fluctuations in the internal pressure of the manhole 1.
[0017]
When rainwater or the like flows into the outer lid 6 in the manhole, as shown in FIG. 2, the inner lid 7 floats due to its buoyancy, thereby opening the opening 6 </ b> B of the outer lid 6. Water is drained into the manhole 1 through the opened opening 6B. After draining, the inner lid 7 quickly descends due to the weight of the guide bar 8 and closes the opening 6B of the outer lid 6.
[0018]
Since the strength of the outer lid 6 is high, even if a person accidentally gets on the outer lid 6 or drops equipment when the iron lid 3 is opened, the outer lid 6 breaks and people There is no risk of falling into the manhole 1.
[0019]
Further, the heat insulating inner lid of the present invention is applicable not only when the manhole side wall is vertical as described above but also when the manhole side wall is inclined as shown in FIG.
[0020]
【The invention's effect】
As described above, according to the present invention, it is possible to effectively block both radiant heat transfer and convective heat transfer to the manhole iron cover, and to reliably drain the inflow water into the manhole, Due to the simple structure, the manufacturing cost is low, and even if a person accidentally gets on the outer lid or drops the equipment, the outer lid may break and people or equipment may fall into the manhole. It has a useful effect.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing an installed state of an inner cover for heat insulation according to the present invention.
FIG. 2 is a partial cross-sectional view of the heat insulating inner lid of the present invention, showing a state where the inner lid is lifted by buoyancy.
FIG. 3 is a partial sectional view showing an installed state of the heat insulating inner lid of the present invention in another manhole.
[Explanation of symbols]
1: Manhole 2: Receiving frame 3: Iron lid 4: Mounting frame 5: Bolt 6: Outer lid 6A: Flange 6B: Opening 7: Inner lid 8: Guide bar 9: Stopper 10: Insulating material

Claims (3)

A concave outer lid that is detachably attached to the inner side of the iron lid receiving frame of the manhole, and an inner lid that is detachably attached to the outer lid, the outer lid having a cylindrical shape and having a bottom portion, An opening is formed in the bottom , the inner lid has an area larger than the opening, and when there is no inflow water into the outer peripheral lid, the opening is blocked by the lowering due to the weight of the inner lid, When there is inflow water into the outer lid, the inner lid floats due to the buoyancy of the inner lid, and the opening is opened. Thus, the inflow water in the outer lid opens from the opening into the manhole. An inner lid for heat insulation of a manhole, characterized by being drained.   The inner cover is attached to the outer peripheral cover via a guide bar, and the guide bar floats together with the inner cover and acts as a weight of the inner cover. Inner lid for thermal insulation of manholes.   The inner cover for manhole insulation according to claim 1 or 2, wherein the outer peripheral cover is covered with a heat insulating material, and the inner cover is formed of a heat insulating material.

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