JPS636690B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an iron lid equipped with an anti-icing device.

Conventionally, iron covers such as manhole covers and fire hydrant covers, which are installed on the road surface, are exposed to moisture in the cold winter months in cold regions, where moisture is trapped between the steeply inclined inner circumferential surface of the iron cover and the cover. The iron lid froze, and in order to open the lid, the iron lid had to be heated with a burner or the like to thaw it. For this reason, especially in the case of fire hydrant lids, in the event of a fire, the iron lid must be opened and used immediately, but it takes time to heat the lid with a burner, etc., and the fire hydrant can be used in a short time. It had the disadvantage that it could not be used.

Therefore, in the present invention, an iron lid with a heat retention device is constructed, which is characterized by an electric heating element disposed on the steeply inclined inner circumferential surface of the iron lid with the lid of the receiving frame. To prevent a lid part from becoming unable to open due to freezing of moisture in a gap between a steeply inclined joint surface between a receiving frame of an iron lid disposed on a road surface and the lid part in a cold region.
Therefore, it is particularly effective in cases where the lid must be opened immediately during use, such as the iron lid of a fire hydrant. In addition, since the steeply inclined inner circumferential surface of the iron cover with the lid of the receiving frame is insulated, it can be used even when devices such as gate valves and water inlets are installed in the manhole where the iron lid is installed. Normally, in cold regions during the winter, the equipment inside these manholes freezes and cannot be used immediately, but the heat retention of the iron lid receiving frame can keep the equipment inside the manhole warm as well. It is also possible to prevent these devices from freezing.

Embodiments of the iron lid of a fire hydrant according to the present invention will be described based on the drawings. First of all, Figure 1 shows a cross-sectional view of a fire hydrant. A branch pipe 2 is installed upright from the water pipe 1 at the location where the fire hydrant is installed, and a manhole 3 is installed around this branch pipe 2 to the road surface. A manhole room 3a is formed underground, and this manhole room 3
A gate valve 4 is disposed at the tip of the branch pipe 2 in a, and a fire hydrant outlet 5 is disposed through the gate valve 4, and a receiving frame 12 is connected to the receiving frame 12 at the road surface position at the upper end of the manhole 3. An iron cover 10 consisting of a cover part 11 fitted into the steeply inclined joint inner circumferential surface part 12a is disposed to close the open end of the manhole 3. To use this fire hydrant, first open the lid 11 of the iron lid 10 to open the open end of the manhole 3, then remove the cap 5a of the fire hydrant mouth 5 and connect the mouth of the fire hose. Then, when the gate valve 4 is opened, water gushes out from the fire hose.

When using this fire hydrant in cold regions during the winter, the iron lid
The moisture in the gap between the cover 11 of the manhole and the steeply inclined inner peripheral surface 12a of the receiving frame 12 into which the cover 11 is fitted freezes and cannot be opened unless heated with a burner or the like. The gate valve 4 and the fire hydrant port 5 disposed in the room 3a are also frozen and cannot be used unless they are thawed by heating.

For this purpose, the iron cover 10 shown in Fig. 2 is attached to the manhole 3.
The problem is solved by arranging it at the open end of the This iron lid 10 is an inner space 12b of the receiving frame 12.
A connection box 13 is provided in the connection box 13, and a wiring 15 is installed underground through a through hole 14 made in the outer wall 12c of the receiving frame 12. Connected to commercial power.
Further, a plurality of holes 16 are arranged from the bottom to the top inside the steeply inclined inner circumferential surface 12a of the receiving frame 12.
A cylindrical electric heater 17 is inserted into this hole 16 from below.
is inserted, and a thermostat 18 is inserted into one place in the hole 16, and the wiring for the electric heater 17 and thermostat 18 is arranged in the lower part of the inner space 12b of the receiving frame 12 and connected to the connection box 13.
It is connected to the.

Utility Model Publication No. 45-25950 has a structure in which a low-temperature heat-generating layer is bonded to the inner surface of the container by metallization processing of an alloy of high electrical resistance.The heat generated from the low-temperature heat-generating layer is transferred to the iron lid as radiant heat. However, this radiant heat is unable to thaw the ice on the steeply inclined joint surface between the iron receiving frame and the iron lid plate, which is caused by the difference in outside air temperature and the humidity inside the water dispenser.

As described above, the present invention embeds the electric heater 17 directly in the steeply inclined inner circumferential surface 12a of the iron lid 10 and the steeply inclined joint inner circumferential surface 12a of the receiving frame 12 to transfer the heat of the steeply inclined inner circumferential surface 12a of the receiving frame 12 to the cover 11. Since the heat is directly conducted to the steeply inclined joint outer peripheral surface portion 11a, the lid portion 11 does not freeze to the receiving frame 12. Also, receiving frame 12
When the manhole chamber 3a disposed in the receiving frame 12 is heated, the inside of the manhole chamber 3a arranged in the receiving frame 12 is also kept warm.
It is also possible to prevent the gate valve 4 and the fire hydrant opening 5 disposed inside from freezing. Since a thermostat 18 is disposed in the inner space 12b of the receiving frame 12, the receiving frame 12 can be maintained at a preset temperature.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the fire hydrant, and FIG. 2 is a partially sectional perspective view of the iron lid. 10~ Iron lid, 11~ Lid part, 12~ Receiver frame, 13~
Connection box, 16-hole of receiving frame, 17-electric heater, 18-thermostat.

Claims (1)

[Claims] 1 Lid part 1 formed with a steeply inclined joint outer peripheral surface part 11a that joins with a steeply inclined joint inner peripheral surface part 12a of the receiving frame 12
1, a steeply inclined joint inner peripheral surface part 12a which is joined to the steeply inclined joint outer peripheral surface part 11a of the lid part 11 and has a plurality of holes 16 arranged from the bottom to the top, and an inner space part 1.
2b and a receiving frame formed with an outer wall 12c, electric heaters 17 are fitted into each of the plurality of holes 16, and these electric heaters 17 are provided in the inner space 12b. Connection hook 13 and through hole 14 in outer wall 12c of receiving frame 12
The heat from the electric heater 17 is transferred to the steeply inclined joint outer peripheral surface 1 of the lid 10.
1a and a steeply inclined joint inner circumferential surface portion 12a of a receiving frame 12. This iron lid is characterized in that it is configured to conduct electricity between the inner peripheral surface portion 12a of a receiving frame 12.