JPH022784B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal cable winding device used for measuring the location of water leaks in water pipes.

As shown in FIG. 1, as a water pipe leak position measurement method, a joint box 4, first and second water leakage sound sensors 5 are placed in a water pipe 1 and flowing water 2 having the water pressure and flow velocity shown by the arrows. , 6, and the windsock 7, the water leakage sound sensors 5 and 6 are arranged in a straight line at a predetermined distance using wires 8 and 9, and the first and second water leakage sound sensors are connected via the joint box 4. The signal cable 3 connected to the water pipes 5 and 6 is sent downstream in the flowing water 2, and the leakage sound generated from the leakage point of the water pipe 1 is transmitted to the water leakage sound sensors 5 and 6, for example, underwater microphones 5a and 6a.
A method has been proposed in which the detected water leakage sound signals are transmitted to a measuring device on the ground via the signal cable 3, and the location of the water leakage in the water pipe 1 is accurately measured using a known correlation method.

In this water leak location measurement method, an existing gate valve 10 and an air valve 11 connected to the water pipe 1 are used, a signal cable feeding device 13 is fixed to the air valve 11 via a connecting pipe 12, and the signal cable is wound. Taking device 20
Connect the signal cable 3 to the signal cable sending device 13
After introducing the pressurized water into the interior through the water sealing device 14,
The first and second cords of the signal cable 3 are connected to the underwater microphones 5a and 6a of the first and second water leak sound sensors 5 and 6 as described above, and then the gate valve 10,
Open the air valves 11 one after another to supply the flowing water 2 to the connecting pipe 12,
The signal cable feeding device 13 is filled, and the guide tube 15 is connected to the signal cable feeding device 13, the connecting tube 12,
After being inserted into the flowing water 2 through the air valve 11 and the gate valve 10 and fixed, the flowing water 2 is inserted through the guide pipe 15.
Inside there are streamers 7, second and first water leakage sound sensors 6,
5. Insert and move the joint box 4 and signal cable 3 in this order by feeding operations of the signal cable winding device 20 and the signal cable feeding device 13.

Underwater microphone 5 of water leakage sound sensor 5, 6
When a and 6a detect the water leakage sound generated from the water leakage point of the water pipe 1, these detected water leakage sound signals are transmitted to the measuring device on the ground via the first and second cords of the signal cable 3, This measuring device calculates the leakage sound detection time difference between the water leakage sounds detected by the first and second water leakage sound sensors 5 and 6, and calculates the water leakage sound detection time difference between the water leakage sound detection times and the water leakage sound detection time difference between the water leakage sounds detected by the first and second water leakage sound sensors 5 and 6.
The first water leakage sound sensor 5 is connected to the water pipe 1 from the leakage point depending on the length of the gap and the propagation speed of the leakage sound in the flowing water 2.
The position of the water leak in the water pipe 1 is determined based on this length and the length of the signal cable 3 from the guide pipe 15 in the flowing water 2 to the first water leak sound sensor 5.

As described above, in the leak measurement method using the known correlation method, which uses two water leak sound sensors to calculate the water leak sound detection time difference and measure the water leak position, the level of the water leak sound generated from the water leak point is This system has the great feature that the leak position can be reliably measured not only when the water leak sound level is steeply high, but also when the water leak sound level is low over a wide area around the leak location.

Therefore, the signal cable winding device 20 simply winds the signal cable 3 having the first and second cords, sends out the signal cable 3 when measuring the water leakage position, and unwinds the signal cable 3 when the measurement of the water leakage position is completed. In addition to having the function of winding up the water leakage sound, it also has the function of transmitting the water leakage sound signal detected by the first and second water leakage sound sensors 5 and 6 and transmitted via the signal cable 3 to the measuring instrument. need to be.

The present invention aims to provide a signal cable winding device that is effective for use in measuring the location of leaks in water pipes using the correlation method as described above, and will be explained below with reference to the drawings.

FIGS. 2A and 2B show a front view and a sectional view taken along line B-B of an embodiment of the signal cable winding device according to the present invention. A rotating drum 25 is attached via 24a and 24b, and the rotating drum 25
A first cord 3a, a second cord 3a and a second
A signal cable 3 having a cord 3b of A second charge amplifier 26a connected to the second cord 3b, and a second wireless transmitter 27b connected to the second charge amplifier 26b are each fixed to the frame 25c of the rotating drum 25. It is fixed to cases 28a and 28b.

Note that the first and second charge amplifiers 26a, 26
b, and the first and second wireless transmitters 27a and 27b each have the same performance and are equipped with a necessary power source for operation.

These first and second charge amplifiers 26a, 2
The proximal ends of the first and second cords 3a and 3b of the signal cable 3 are connected to the terminals 6 through connectors 29a and 29b attached to the cases 28a and 28b, respectively. The base end of the signal cable 3 is connected to a mounting bracket 3 fixed to the body 25d of the rotating drum 25.
0 is fixed to a cable passing metal fitting 32 attached to the cable.

Further, inside the hollow fixed shaft 23, there is a third rotary shaft 31.
As shown in the enlarged view of the main part in the figure, it is loosely inserted into the rotating shaft 3.
The end on the fixing metal fitting 22 side fixed to the frame 21 of No. 1 is inserted into the hole 32a of the connecting fitting 32, and the pin 33
a and 33b, and the other end is fitted into a hole 35a of a stepped connecting fitting 35, which is fixed to the frame 25c of the rotating drum 25 with screws 34a to 34d, and a pin 36a. , 36b, and is fixed to the stepped connecting fitting 35.

Further, an operating handle 37 is welded to the connecting fitting 32, and between the fixed shaft 23 and the rotating shaft 31, a washer 38, an oil seal 39,
A sliding bearing 40 is interposed.

Therefore, by rotating the operating handle 37 to the right or left, the rotational force is transmitted to the rotating drum 25 via the rotating shaft 31 and the step-shaped connecting fitting 35, rotating the rotating drum 25, and rotating the outer circumference of the rotating drum 25. 2
The signal cable 3 wound around the cable 5a is fed out or wound up.

Next, the operation of the signal cable winding device configured as described above will be described.

When measuring the water leak position in a water pipe, first, the operating handle 37 of the signal cable winding device 20 is rotated counterclockwise to send out the signal cable 3 wound around the outer circumferential portion 25a of the rotating drum 25. The sent out signal cable 3 is introduced into the signal cable feeding device 13 through the pressurized water sealing device 14 as described above in FIG. via the first and second cords 3a, 3b
Underwater microphones 5a and 6a of the first and second water leakage sound sensors 5 and 6 are connected to the submersible terminals, respectively.

Next, by rotating the feed handle (not shown) of the signal cable feed device 13 and the operation handle 37 of the signal cable winding device 20 counterclockwise, the windsock 7, the second water leak sound sensor 6, and the first water leak sound are detected. The sound sensor 5, joint box 4, and signal cable 3 are inserted into the flowing water 2 of the water pipe 1 in this order and moved.

When the first and second water leakage sound sensors 5 and 6 are close to the water leakage point of the water pipe 1 and the water leakage sound is detected by the underwater microphones 5a and 6a, the detected water leakage sound signal is transmitted to the first and second water leakage sound sensors of the signal cable 3. second code 3
Inside the body 25 of the rotating drum 25 via a and 3b
The first and second charge amplifiers 26 fixed to b
a, 26b. The water leakage sound signal is amplified by charge amplifiers 26a and 26b, modulated by radio transmitters 27a and 27b, respectively, and sent to antennas AT ₁ ,
It is sent from AT ₂ to a measuring device (not shown). The measuring device is equipped with a wireless receiver (not shown), which demodulates a water leakage sound signal from the received wireless signal and sends it to a correlator (not shown).

When the correlator calculates the leakage sound detection time difference between the water leakage sounds detected by the first and second water leakage sound sensors 5 and 6, the sending of the signal cable 3 is stopped, and as described above in FIG. The location of the water leak in the water pipe 1 is determined.

Upon completion of measuring the water leakage location, the signal cable 3
are the feeding handle of the signal cable feeding device 13 and the operating handle 37 of the signal cable winding device 20.
The rotating drum 25 can be rotated clockwise by rotating each
It is wound up.

In the above-described feeding and winding of the signal cable 3, the rotary drum 25 is rotated without any trouble by the rotation operation of the operating handle 37, and the first and second charge amplifiers 26a, 26b and the first charge amplifier rotate with this rotation. , second wireless transmitter 2
7a and 27b are connected to the first and second cords 3 of the signal cable 3 because operating power supplies are built into the first and second charge amplifiers 26a and 26b, respectively.
The water leakage sound signals transmitted from a and 3b can be immediately amplified and modulated and sent to the correlator.

As explained above, according to the signal cable winding device according to the present invention, the signal cable having the first and second cords used for measuring the leakage position of water pipes by the correlation method is wound around the outer circumference of the body of the rotating drum. Inside the body are first and second charge amplifiers connected to the base ends of the first and second cords of the signal cable, and first and second charge amplifiers connected to the first and second charge amplifiers. The second radio transmitter is fixed with a built-in operating power supply, and to start and end the measurement of the water leak location, the rotary drum is rotated by simply rotating the operation handle, and the signal cable is connected. The water leakage sound detected by the first and second water leakage sound sensors is directly amplified by the first and second charge amplifiers, and modulated by the first and second wireless transmitters. hand,
This has the advantage that it can be transmitted to a correlator of a measuring instrument equipped with a wireless receiver.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram illustrating a water pipe leakage position measurement method, Figs.
The figure is an enlarged view of the main parts. 1...Water pipe, 2...Running water, 3...Signal cable, 4
...Joint box, 5, 6...Water leakage sound sensor, 7...Streamer, 8,9...Messenger wire, 10...Gate valve, 11...Air valve, 12...Connecting pipe, 13...Signal cable feeder, 14... Pressurized water sealing device, 15... Guide pipe, 20... Signal cable winding device, 21... Frame, 23... Hollow fixed shaft, 24
a, 24b...ball bearing, 25...rotating drum, 26
a, 26b...charge amplifier, 27a, 27b...
Wireless transmitter, 28a, 28b...Case, 29a,
29b... Connector, 31... Rotating shaft, 32... Cable penetration hardware, 35... Stepped connection fitting, 33a, 33
b, 36a, 36b...Pin, 37...Operation handle, 38...Washer, 39...Oil seal, 40...Slide bearing.

Claims (1)

[Claims] 1. In a signal cable winding device of a measuring device used to measure the location of water leaks in water pipes, a rotating drum is attached via a rolling bearing to a hollow fixed shaft fixed to a pedestal, and the rotating shaft is attached to the hollow fixed shaft. One end is fixed to the frame of the rotating drum via a first connecting fitting, and the other end is inserted into the hollow fixed shaft so as to be supported via a slide bearing, and the other end is connected to the rotating shaft. An operating handle is attached to a second connecting fitting fixed to an extension end extending beyond the hollow fixed shaft on the side opposite to the fitting side, and first and second cords are provided on the outer periphery of the body of the rotating drum. A signal cable is wound around the body of the rotating drum, and a first charge amplifier, a first wireless transmitter connected to the first charge amplifier, a second charge amplifier, and a second wireless transmitter connected to the second charge amplifier are installed inside the body of the rotating drum. 2 wireless transmitters are attached, and the proximal end of the first cord of the signal cable is connected to the first cord.
The proximal ends of the second cords are connected to the second charge amplifier, respectively, and by rotating the operating handle to the left or right, the rotating shaft and rotating drum are rotated, and the signal cable is sent out. Alternatively, a signal cable winding device characterized in that it is configured to be capable of winding and wirelessly transmitting signals transmitted via the signal cable.