JPH03156035A - Man-hole control system and structure of man-hole cover used therefor - Google Patents

Abstract

PURPOSE:To facilitate work by burying a delivery duct from an air-hole provided to a position separated from an inlet to a man-hole room to a connection end for connecting a suction device provided to the ground. CONSTITUTION:When work is carried out in a man-hole room 2 of a man-hole facility 1, a blower 22 is connected to a connection end 12a in a connecting box 3. After that, when the blower 22 is driven, air on the ground is supplied to the inside of the room 2 through a delivery duct 12 and air-hole 11. Then, the air in the room 2 is exhausted from an exhaust port 20 of a man-hole cover 17. The work is carried out after a worker removes the cover 17 to get into the room 2 and close the cover 17. In addition, when water stands in a bilge 13, a pump 23 is connected to a connection end 14a in the box 3 to drive, and the water is pumped up to the ground a through a water conduit to discharge.

Description

[Detailed Description of the Invention] (Purpose of the Invention) <Industrial Application Field> The present invention can be used for a management system for a manhole room provided for maintenance and inspection of underground telephone lines, etc. It concerns the construction of a suitable manhole cover.

<Background of the Invention> Work inside manholes is carried out as part of the maintenance and inspection of telephone lines, gas pipes, water pipes, etc. buried underground.

When working inside this manhole, conventionally, in order to avoid an oxygen deficiency state in the manhole room M, as shown in Fig. 5, the manhole cover C was removed and the work was carried out near the entrance I to the manhole room M. At this time, a hose H was drawn from the blower pump B into the manhole room M to supply air. However, with this method, it is necessary to erect a safety shelf F on the ground to surround the inlet part (■), and to install a partition plate K between the blower pump B and the inlet part (2).
These were obstacles to traffic. Of course, since these construction projects are of a highly public nature, construction approvals are easily obtained from the competent administrative authorities, but it is undeniable that they become a traffic hindrance, and rainwater flows into the manhole room M through the gap at the entrance. When draining water, a hose must be inserted through the inlet I and a drainage pump must be used to pump the water to the ground, which also causes traffic problems.

(Technical matters attempted to be developed) The present invention was made in view of this background,
By providing a structure separate from the manhole entrance that allows air from above the ground to be sent into the manhole room and water accumulated in the manhole room to be discharged, it is possible to work in the manhole room with the manhole cover closed. This is an attempt to develop a manhole management system and a manhole cover structure for use in the system, which will allow the manholes to operate without interfering with ground traffic during work.

(Structure of the Invention) (Means for Achieving the Object) That is, the manhole management system, which is the first invention related to the present application, provides a manhole management system for a manhole room blocked by a manhole cover at a location different from the entrance to the manhole room. An air supply hole is provided, and an air supply duct is buried from the air supply hole to a connecting end for connecting an air intake device, which is provided at a location that does not obstruct road traffic on the ground.

In addition to the above-mentioned requirements, the manhole management system, which is the second invention related to the present application, is provided with a bilge on the floor of the manhole room and a pumping mechanism for pumping water accumulated in the bilge to the ground. It consists of characteristics.

Furthermore, the manhole cover structure used in the manhole management system, which is the third invention related to the present application, is characterized by forming an exhaust hole in the cover body and providing a dirt receiving part on the manhole chamber side of the cover body. It is something.

These inventions attempt to achieve the above object.

(Function of the invention) In the present invention, an air supply hole is provided in a manhole room blocked by a manhole cover at a position different from the entrance to the manhole room, and from this air supply hole, ground road traffic to the connection end for connecting the intake device, which is located in a place where it will not interfere with the
Since the air supply duct is buried, ground air can be taken into the manhole room without going through the manhole entrance.

In addition, if a bilge is installed on the floor of the manhole room and a pumping mechanism is installed to pump the water collected in the bilge to the ground, the water collected in the bilge can be pumped out of the manhole room without going through the manhole entrance. Can be discharged.

Furthermore, if an exhaust hole is formed in the cover body of the manhole cover,
The air supplied from the air supply hole is exhausted from this exhaust hole.

Furthermore, if a garbage receiving part is provided on the manhole chamber side of the manhole cover, the large exhaust hole will prevent the garbage and mud from falling into the manhole chamber. .

<Examples> The present invention will be specifically described below based on illustrated examples. Reference numeral 1 denotes a manhole facility to which the manhole management system of the present invention is applied, and this facility includes a manhole room 2 for telephone line cables and a manhole room 2 near this manhole room 2, which is an example of a manhole facility formed under a road. The connecting box 3 is provided with a connection box 3 embedded in a place beside the road where it does not obstruct traffic, with the lid part being at the same level as the ground surface. An entrance part 4 is formed in the manhole room 2 as a communication port with the ground, and a ladder 5 is provided for going in and out of the manhole room 2 from this entrance part 4. In addition to the telephone line cable 6, the manhole room 2 is provided with a power distribution board 8 equipped with an outlet 7 that serves as a power source for lighting equipment used during work, and a switch for operating a water pump to be described later. Furthermore, air holes 11 are provided in the ceiling and four corners of the manhole room 2, respectively. The air holes 11 provided in the ceiling are holes made in the air guide pipes 11a installed in the ceiling, and the air holes 11 provided in the four corners of the manhole room 2 are as shown in Fig. 3(a). As shown in FIG. For example, three air pipes 11b are formed at intervals.The air pipes 11a at the four corners of the manhole room 2 are connected to the air pipes 11a on the ceiling, and the air pipes 11a on the ceiling are connected to the air pipes 11a. The duct 12 is connected.The air supply duct 12 passes through the ground and reaches the connection box 3, where the connection end 12a for connecting the intake device is formed.As described above, the air guide pipe 11a The method of arranging the manhole along the wall is carried out for the existing manhole room 2, but when constructing a new manhole, it is installed inside the wall 2a of the manhole room 2 as shown in Fig. Alternatively, the air guide pipe 11a may be arranged so that only the air pipe 11b faces into the manhole room 2.

Furthermore, in this embodiment, by providing a connection end 12a for connecting an air intake device, the air intake device is connected to this connection end 12a to supply air into the manhole room 2 each time work is performed. The air supply duct 12 is installed in the manhole room 2 where there are a large number of wire cables 6 and therefore work is frequently performed.
A built-in intake device may be connected to the end of the unit.

Furthermore, the reason why the air supply hole 11 is provided in the manhole room 2 in this way is to supply ground air into the manhole room 2 through the air supply duct 2. Providing a point for supplying air into the room 2 is a characteristic feature of the present invention. The floor surface of the manhole room 2 is slightly inclined toward one corner, and a bilge 13 is formed in this corner to collect rainwater that has entered from the entrance 4. The end of the water conduit 14 that runs along the wall of the manhole room 2 is facing. This water pipe 14 passes underground from the top of the manhole room 2. It reaches inside the Jl'E hook 3, and a connection end 14a for pump connection is formed there. Incidentally, this connection end 14a is a place where a pump for pumping up water is connected during work, and in this case, the pump may be installed in the same way as the intake device, or the water conduit pipe 1 as described above may be installed.
4 is a configuration in which a water pipe 14 is connected to an existing manhole room 2.
However, if a new manhole is installed, the water conduit 14 may be installed inside the wall 2a of the manhole room 2 as shown in FIG. 3(b).
3. The water conduit 14 and the pump described above are collectively defined as a pumping mechanism 15. On the other hand, the manhole room 2 has an entrance section 4.
A manhole cover 17 is provided to cover the area. As shown in FIG. 4, this manhole M17 includes a dish-shaped dirt receiving portion 19 formed on the lower side of a disc-shaped lid body 18 that is slightly bulged upward.

A plurality of large and small exhaust holes 20 are formed radially in the lid body 18, for example. Incidentally, in the manhole management system of the present invention, work is performed with the entrance portion 4 blocked by the manhole i17, so when air is supplied from the air supply hole 11, that amount of air is exhausted from the manhole room 2 to the ground. This is why the exhaust hole 20 is provided. In addition, unlike the conventional type, the dust receiving part 19 has a large exhaust hole 20, which makes it easier for dirt and mud to enter from here. This is the stopping part. Further, the periphery of the garbage receiving portion 19 is tapered to prevent garbage from falling, but for convenience when disposing of such garbage, a portion of the edge is tapered as shown in Fig. 4. Of course, the exhaust may not be from the manhole M17, but a separate exhaust duct to the ground may be provided, and in such a case, the manhole cover 17
It is not necessarily necessary to provide a dust receiving part 19 or an exhaust hole 2o at the connection end 12a of the 0th order connection box 3,
The blower 22 and pump 23, which are respectively connected to 14a, will be explained.

A motor M is integrally attached to the blower 22,
The blower 22 is rotated by the drive of the motor M, takes in air from the ground, and sends outside air into the air supply duct 12 via the connection end 12a. Note that the power source for driving the motor M may be provided by using a portable generator, or alternatively, if there is a power connection end in the connection box 3, it may be taken in from there. Of course, a prime mover may be used instead of the motor M as the drive source for the blower 22, and the same applies to the power source for sucking up water in the bilge 13. The pump 23 also has a water intake port 24 and a drain port 25.
is provided, and the water intake port 24 side is connected to the connection end 14a. Furthermore, a sensor section of a water level meter that measures the water level of the water accumulated in the bilge 13 and a sensor section of a gas concentration meter that measures the oxygen concentration inside the manhole room 2 are installed in the manhole room 2, and the display section of each instrument is used as an example for connection. It may be provided in box 3.
Although a gas concentration meter may be provided in the manhole chamber 2 just in case, a water level meter does not need to be provided in the manhole chamber 2 since the water level can be visually observed within the manhole chamber 2.

The manhole management system of the present invention and the manhole cover structure used therein have the structure as described above, and a method of using this system will be described below. First, when working inside manhole room 2,
A blower 22 is connected to each connection end 12a provided in the connection box 3. When the blower 22 is driven, ground air is supplied into the manhole room 2 through the air supply duct 12 and the air supply hole 11. As a result, the air inside the manhole chamber 2 is exhausted from the exhaust hole 20 in the manhole cover 17, and the inside of the manhole chamber 2 becomes a workable environment. In this state, the worker removes the manhole cover 17 once, enters the manhole room 2, and then removes the manhole cover 17 again.
Work is carried out with the manhole cover 17 closed, so while the worker is working, the manhole cover 17 is closed.

There will be no obstacles on the road.

In addition, when water has accumulated in the bilge 13, the pump 23 is connected to the connection end 14a in the connection box 3 and driven to pump water to the ground via the water pipe 14 and discharge it. Contact the workers on the ground as appropriate, temporarily stop traffic on the road, open the manhole cover 17 again, and let the workers inside the manhole room 2 go to the ground.

(Effects of the Invention) In the manhole management system of the present invention, air is supplied into the manhole room 2 from the entrance portion 4 of the manhole room 2.
This is done by connecting the intake device to the connection end 12a in the connection box 3 installed on the side of the road, and the air supply duct 12, which is the air supply path, is located underground. When working, leave the manhole cover 17 open,
There is no need to place an intake device on the road, and traffic obstruction caused by these obstacles is avoided.

Further, by forming the exhaust hole 20 in the manhole i17, the air in the manhole chamber 2 is exhausted when air is supplied from the intake device, and it also normally functions as an air communication hole with the ground.

Furthermore, since the manhole cover 17 is provided with a garbage receiving part 19,
This retains dirt and mud that enter through the exhaust hole 20, and the inside of the manhole room 2 can be maintained in a clean state.

Furthermore, a bilge 13 is formed on the floor of the manhole room 2, and a pumping mechanism 15 for pumping up the water accumulated in the bilge 13 to the ground is provided, so that the manhole entrance 4
The water accumulated in the bilge 13 can be discharged to the outside of the manhole room 2 without going through it, and therefore, even when such work is necessary, traffic is not obstructed.

[Brief explanation of the drawing]

FIG. 1 is a transparent perspective view showing a manhole facility used in the manhole management system of the present invention, FIG. 2 is a longitudinal side view of the same, and FIG. 3 is a longitudinal side view showing the arrangement of the wind pipe and the water pipe. FIG. 4 is a perspective view and a half-sectional view of a manhole cover showing the manhole cover structure of the present invention, and a side view showing the state when trash is thrown away. FIG. 5 is a perspective view showing a conventional method of working inside a manhole room. It is. l; Manhole facility 2; Manhole room 2a; Manhole room wall 3; Connection box 4; Entrance 5; Ladder 6; Telephone line cable 7; Outlet 8; Switchboard 11; 12; Air supply duct 12a; Connection end 13; Bilge 14; Water conduit 14a; Connection end 15i pumping mechanism 17; Manhole cover 18; Lid body 19; Dust receiver 20; Exhaust hole 22; Blower 23: Pump 24; Water intake 25; Drain port M; Motor Fig. 3 (G)

Claims (3)

[Claims] (1) For a manhole room blocked by a manhole cover, an air supply hole is provided at a location different from the entrance to the manhole room, and this air intake hole is provided at a location that does not obstruct road traffic on the ground. A manhole management system characterized by an air supply duct buried all the way to the connection end for device connection. (2) The manhole management system according to claim 1, further comprising a bilge provided on the floor of the manhole room, and a pumping mechanism for pumping water accumulated in the bilge to the ground. (3) A manhole cover structure used in a manhole management system, characterized in that an exhaust hole is formed in the cover body, and a dirt receiving part is provided on the manhole chamber side of the cover body.