JPH05260636A - Method for inspecting leaked oil within manhole for of cable - Google Patents

Abstract

PURPOSE:To inspect presence or absence of leaked oil in a manhole easily for providing measures against leaked oil readily by fixing the other edge of a flexible tube whose one edge is fixed to a float into a hand hole for inspection. CONSTITUTION:One edge 4a of a flexible tube 4 is fixed to a float 5 so that a part which is slightly lower than a draught line of the float 5 is an open edge and the other edge 4b is fixed into a hand hole 3 for inspection. Then, the float 5 is positioned into a liquid reservoir measure 2 provided on a floor 1b of a manhole 1. When oil leakage of an OF cable line is detected, the open edge 4b which is positioned within the hand hole 3 is depressurized by evacuation, thus sucking an oil within the liquid reservoir measure 2 when there is leaked oil in the manhole 1 and visually confirming presence or absence of the leaked oil. Therefore, time required for ventilation, drain, etc., within the manhole and time for acquisition, etc., of permission at a location with heavy traffic are not needed, thus reducing time required for inspecting leaked oil drastically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil leak inspection method in a human hole of an OF cable line.

[0002]

2. Description of the Related Art In an OF cable line, when an oil leak is detected by an oil amount or hydraulic pressure lower limit alarm, first go to a human hole where a cable connecting portion is installed to check for oil leak in the human hole. To do. There is no established technique for this inspection. Conventionally, after opening the human hole lid, performing ventilation, draining, etc., it entered the human hole and visually checked for oil leakage.

[0003]

In the above-mentioned conventional inspection method, it requires labor and equipment, and it takes time to ventilate and drain the water, and in a place where there is a lot of traffic, the permission to open the human hole cover is obtained. There was a problem such as taking time. Furthermore, in the event of a major oil spill accident, there was a case where the transmission of power to the line had to be stopped.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, easily inspects the presence or absence of oil leaks in the human hole, and makes it possible to speed up measures against oil leaks. The first feature of the method is to provide an oil inspection method. One end of the flexible tube is fixed to the float so that the open end is slightly below the water line of the float. Fix it in the installed inspection handhole and float the float on the water in the human hole or place it on the liquid tank provided on the floor of the human hole to open the flexible tube in the inspection handhole. It is to check the presence or absence of oil leak in the human hole by depressurizing the end by vacuuming or the like and sucking oil or water containing oil.

A second feature of the present invention is that the oil sensor is fixed to the float so that it is located near the water line of the float, and one end of the flexible lead wire of the oil sensor is other than a normal human entrance / exit. Connected to the terminal block in the inspection handhole installed at the location, float the above float on the accumulated water in the human hole, and measure the operating condition of the oil detection sensor from the terminal block to check the leakage of oil in the human hole. It is to check the presence.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical cross-sectional view of a specific example of a human hole for carrying out the method for inspecting oil leakage in the human hole of the present invention. In the drawing, 1 is a manhole in which a connecting portion B of an OF cable A is installed, and its floor 1b
A liquid reservoir 2 is provided in a part of the. An inspection handhole 3 is provided at a location different from the normal entrance / exit 1a of the human hole 1. If this hand hole 3 is provided, for example, on a sidewalk, it is desirable that inspection can be carried out without obstructing the flow of passing vehicles. Numeral 4 is a flexible tube, one end 4a of which is fixed to the float 5 so that the open end is slightly below the water line of the float 5 and the other end 4b is fixed in the inspection handhole 3 as shown in FIG. .. Then, the float 5 is located in the liquid tank 2 provided on the floor 1b of the human hole 1 or, as shown in FIG. Float on the water.

In this state, when oil leakage in the OF cable line is detected, the worker opens the lid of the inspection handhole 3 and opens the open end 1b located in the handhole 3.
Is decompressed by evacuation or the like. If there is an oil leak in the human hole 1, the oil in the liquid sump 2 or the oil floating on the water surface of the accumulated water 6 is sucked up, and the presence or absence of oil leak can be confirmed visually. You can

FIG. 4 is an explanatory view of another specific example of the method for inspecting oil leakage in a human hole according to the present invention. In this specific example, an oil sensor is used in contrast to the flexible tube 4 used in the specific example of FIG. As shown in the figure, the oil detection sensor 8 is placed so as to be located in the vicinity of the water line of the float 5.
Is fixed, one end of the flexible lead wire 7 is connected to the terminal block in the inspection handhole 3, and the float 5 is floated on the water surface of the accumulated water 6 in the human hole 1. By doing so, the oil detection sensor 8 operates with high sensitivity due to the oil content floating on the water surface of the accumulated water 6, and the operating condition of the oil detection sensor 8 can be measured from the terminal block in the inspection handhole 3. Thus, it is possible to check the presence or absence of oil leakage in the human hole 1.

[0009]

As described above, according to the method for inspecting oil leakage in the human hole of the present invention, the operator can open the lid of the inspection handhole without entering the human hole unlike the conventional case. It is possible to easily check for oil leaks. Therefore, the time required for ventilation and drainage in a human hole and the time for obtaining a permit in a place with a large amount of traffic are not required as in the conventional case, and the work time for oil leakage inspection can be greatly reduced. Especially if you set up a hand hole for inspection on the sidewalk,
Since it does not impede the flow of passing vehicles, it is extremely effective when the method of the present invention is used for oil leak inspection of human holes installed in places where there are many passing vehicles.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a specific example of a human hole for carrying out an oil leak inspection method for a human hole of the present invention.

FIG. 2 is an explanatory view showing a state in which a float to which a flexible tube is fixed according to the present invention is floated on the water surface of accumulated water in a human hole.

FIG. 3 is an explanatory diagram of a state where a flexible tube is fixed to a float.

FIG. 4 is a partial explanatory view of another specific example of the method for inspecting oil leakage inside a human hole of the present invention.

[Explanation of symbols]

 1 Human hole 2 Liquid reservoir 3 Hand hole for inspection 4 Flexible tube 5 Float 6 Water accumulated in human hole 7 Flexible lead wire 8 Oil sensor

Claims (2)

[Claims] 1. A flexible tube whose one end is fixed to the float so that an opening slightly below the water line of the float is an open end, and the other end is fixed in an inspection handhole installed at a place other than a normal human port entrance / exit, Float the float in the water in the human hole, or position it in a liquid tank provided on the floor of the human hole, and depressurize the open end in the inspection handhole of the flexible tube by evacuation or the like or oil or A method for inspecting oil leakage in a human hole for an OF cable, which comprises inspecting for the presence of oil leakage in a human hole depending on whether or not water containing oil is sucked up. 2. An inspection handhole in which an oil detection sensor is fixed to the float so that it is located near the waterline of the float, and one end of a flexible lead wire of the oil detection sensor is installed at a place other than a normal human hole entrance / exit. It is connected to the terminal block of, the float is floated on the accumulated water in the human hole, and the presence or absence of oil leak in the human hole is checked by measuring the operating condition of the oil detection sensor from the terminal block. How to check oil leak in human hole for OF cable.