JPH0446834B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a closing structure of a manhole provided in a water tank such as a heat storage tank, particularly having a heat insulating performance.

(Prior Art) A water tank for storing cold or hot water, such as a heat storage tank, is required to have high heat insulation performance so that heat loss from the water tank is small and the water temperature is kept constant for a long time. For this reason, it goes without saying that measures such as installing insulation materials on all surfaces that make up the aquarium (walls, floor, ceiling), but also insulating the manhole area where a large amount of heat loss occurs. Performance needs to be improved.

As a means for improving the heat insulation performance of the manhole portion as described above, for example, the method shown in FIG. 4 has been generally used. This is manhole a
In addition to the cover b, which is a normal manhole closing means, an inner cover c is further provided, and a heat insulating material d is attached to the lower surface of the inner cover c to improve the heat insulation performance.

According to this, the manhole is double-closed to improve airtightness, and heat loss from the manhole can be reduced to some extent.

(Problems to be Solved by the Invention) However, since the inner cover c as described above has a heat insulating material attached to its lower surface as described above, the peripheral edge portion of the inner cover c in contact with the cover receiving member e There was a problem in that a heat insulating material could not be attached to the lower surface f. This causes heat loss from that part, and when the water in the water tank is cold, there is a problem in that the lid b is cooled and condensation forms on its outer surface.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a manhole closing structure with less heat loss.

(Means for Solving the Problems) The present invention provides a circular opening, which is a manhole, in the ceiling of a water tank such as a heat storage tank formed by a building frame, closes the manhole with a circular lid, and allows the manhole to pass through the manhole. A structure for reducing heat loss of the manhole, wherein a plurality of fixing members are fixed to the inner circumferential surface of the manhole, and a circular annular cover receiving member is supported on the fixing members. A member is provided so as to protrude inward from the inner peripheral surface of the manhole in a brim-like manner, and the outer peripheral edge of the lid is placed on the lid receiving member to place the lid inside the manhole. At the same time, a heat insulating material covering the entire lower surface of the lid receiving member and the fixing member is attached to the lower surface side of the lid receiving member so as to be continuous with the heat insulating material attached to the inner surface of the ceiling of the aquarium, A heat insulating material is attached to the upper surface of the lid so as to overlap, at least in plan view, with a heat insulating material attached to the lower surface side of the lid receiving member.

(Function) The present invention is applied to a manhole in a water tank such as a heat storage water tank that is installed in an underground part of a building using its structural frame, that is, a concrete slab or a concrete wall. That is, the manhole to which the present invention is applied is a circular opening provided in a structural frame such as a concrete slab forming the ceiling of a water tank, and a circular annular lid receiving member is provided on the inner peripheral surface of the manhole. The manhole is fixed by a fixing member so as to protrude like a brim, and a circular cover is supported by the cover receiving member to close the manhole. By covering the top surface of the lid, the bottom surface of the lid receiving member for supporting the lid, and the entire fixing member for fixing the lid receiving member with heat insulating material, the entire inside of the manhole is covered with no gaps. This reduces heat loss through the manhole.

(Example) An example of the present invention will be described with reference to FIGS. 1 to 3.

First, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 and 2 are diagrams showing a manhole using this embodiment, and reference numeral 1 in the figures indicates the manhole. manhole 1
is a circular opening provided in the ceiling 2 of the aquarium, and an outer lid 3 is placed on top of the opening. The outer cover 3 is conventionally generally used as a means for closing an opening such as a manhole.

The water tank in this embodiment is a heat storage water tank installed in the basement of a building using its structural frame, that is, a concrete slab and a concrete wall, and the ceiling 2 is formed of a concrete slab.

The manhole 1 is further provided with a lid 4, so that the manhole 1 is doubly closed. That is, L-shaped fixing members 5, 5,
5, 5 are fixed, and the fixing members 5, 5, 5, 5
A lid receiving member 6 is placed and fixed on the upper surface of the housing. The lid receiving member 6 is an annular flat plate member having a hole in the center, and its outer diameter is equal to the diameter of the manhole 1. The lid receiving member 6 is supported by the fixing members 5, and By being fixed to the manhole 1, the manhole 1 is provided in a flange-like manner projecting inward from the inner peripheral surface of the manhole 1.
In addition, a heat insulating material 7 is attached to the entire lower surface of the lid receiving member 6 in succession to a heat insulating material 8 attached to the lower surface of the lid receiving member 6 on the lower surface of the ceiling 2 of the aquarium and the inner periphery of the manhole 1. The insulation material 7
The entire lower surface side of the lid receiving member 6 and the fixing member 5 is covered.

On the upper surface of the lid receiving member 6, the peripheral edge of the lid 4 is placed in close contact with the upper surface of the lid receiving member 6. The lid 4 is a circular flat plate whose diameter is slightly smaller than the diameter of the manhole 1 and larger than the diameter of the hole provided in the center of the lid receiving member 6. A heat insulating material 9 is attached to the entire upper surface of the lid 4.

In addition, the above-mentioned lid 4, fixing member 5, lid receiving member 6
is made of lightweight material such as vinyl chloride.

With the above configuration, in this embodiment, the lid 4 is in close contact with the lid receiving member 6 to close the manhole 1, and the heat insulating materials 7 and 9 are respectively attached to both of them so as to overlap in plan view. , the heat insulating material is installed seamlessly within the manhole 1, and heat loss through the manhole 1 is sufficiently reduced to ensure the heat insulating performance of the water tank.

Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, the lid receiving member 6
A side portion 10 projecting upward is formed on the inner peripheral portion of the lid receiving member 6, and a heat insulating material 11 is attached to the side portion 10 in succession to the heat insulating material 7 attached to the lower surface of the lid receiving member 6. There is. Further, a side portion 12 projecting downward is formed on the outer periphery of the lid 4, and a heat insulating material 13 is attached to this side portion 12 in succession to the heat insulating material 9 attached to the top surface of the lid 4. It is being (Note that the other configurations are the same as those of the previous embodiment.) As a result, in this embodiment, the heat insulating materials 7 and 11 attached to the lid receiving member 6 and the heat insulating materials attached to the lid 4 are Since the materials 9 and 13 overlap not only in plan view but also in side view, the heat insulation performance is improved.

(Effects of the Invention) As explained above, according to the manhole closing action of the present invention, the heat insulating material overlaps in the manhole at least in plan view and is attached seamlessly, so that heat loss from the manhole is reduced. It has the effect of reducing

Furthermore, since the heat insulating material attached to the top surface of the lid does not face inward to the tank, there is no need for waterproofing, which was conventionally required for the heat insulating material attached to the bottom surface of the lid.

In particular, the present invention has an extremely simple structure in which a circular annular lid receiving member, on which a lid is placed and protrudes like a brim, is attached to the inner circumferential surface of a manhole, which is an opening provided in a building frame, using a fixing member. This not only makes it easier to attach the fixing member to the inner peripheral surface of the manhole and the cover receiver to the fixing member, but it also makes it easier to construct the manhole, since an opening with a circular cross section is sufficient. It is easy to construct a manhole at the time of the installation, and it is also easy to modify an existing water tank to provide the structure of the present invention. Moreover, it is possible to compactly fit the fixing member, lid receiving member, and lid all within the thickness of the concrete slab that is the ceiling of the water tank. It is particularly suitable for use in aquariums such as

Furthermore, since the entire lower surface of the lid receiving member and the fixing member is covered with a heat insulating material and the heat insulating material is seamlessly connected to the heat insulating material attached to the inner surface of the aquarium, the outer periphery of the lid receiving member Even if there is a slight gap between the manhole and the inner peripheral surface of the manhole, the gap will be automatically closed by the heat insulating material, and there is no risk of the airtightness being compromised in that area.

[Brief explanation of the drawing]

1 to 3 are diagrams showing embodiments of the present invention. 1 and 2 show a manhole using an embodiment of the present invention, FIG. 1 is a side sectional view thereof, and FIG. 2 is a plan sectional view taken along the line shown in FIG. 1.
FIG. 3 is a side sectional view of a manhole using another embodiment of the present invention. FIG. 4 is a side sectional view showing a conventional manhole closing structure. 1... Manhole, 2... Ceiling, 4... Lid, 5
...Fixing member, 6...Lid receiving member, 7, 8, 9...
...insulation material.

Claims (1)

[Claims] 1. A circular opening, which is a manhole, is provided in the ceiling of a water tank such as a heat storage tank formed by the building frame.
The structure is for closing the manhole with a circular lid and reducing heat loss through the manhole, in which a plurality of fixing members are fixed to the inner peripheral surface of the manhole, and a circular annular lid is mounted on the fixing members. By supporting the receiving member, the lid receiving member is provided in a state in which it projects inward from the inner peripheral surface of the manhole in a flange-like manner, and the outer peripheral edge of the lid is placed on the lid receiving member. Therefore, the lid is arranged inside the manhole, and a heat insulating material is provided on the lower surface side of the lid receiving member to cover the entire lower surface of the lid receiving member and the fixing member.
The insulation material is attached continuously to the insulation material attached to the inner surface of the ceiling of the aquarium, and the insulation material is attached to the top surface of the lid so that it overlaps with the insulation material attached to the lower surface side of the lid receiving member at least in plan view. A manhole closing structure characterized by being attached.