JPH08159400A - Unprocessed feed pipe retrieving system - Google Patents

Abstract

PURPOSE: To provide an unprocessed feed pipe retrieving system in which an unprocessed feed pipe connected to a gas transporting main branched pipe can be retrieved with good working property within a short time. CONSTITUTION: When an acoustic pulse 38 of a frequency A is transmitted from a measuring unit 13, the acoustic pulse 38 is propagated in a main branched pipe 11 from a feed pipe 12 to the branched part of an unprocessed feed pipe 18 and the branched part of a feed pipe 14 having a gas meter 15 mounted thereon, and reflected by these branched parts. The gas meter 15 has a function for transmitting, when the acoustic pulse of the frequency A is received, an acoustic pulse of a frequency B differed from it. The measuring unit 13 receives the reflected waves 51, 52 of the frequency A from the branched parts and the acoustic pulse 45 of the frequency B from the gas meter 15, displays the received waveform, and calculates and displays the presence and position of the unprocessed feed pipe 18 from the pattern of the received waveform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unarranged supply pipe search system for searching an unarranged gas supply pipe branched from a main branch pipe of city gas or the like.

[0002]

2. Description of the Related Art Generally, for example, a main branch pipe for city gas transportation is buried in the ground, and individual gas supply pipes are branched from the main branch pipe to each consumer's house to supply gas. There is. By the way, even if the gas supply pipe is once provided, the gas supply may be stopped due to the relocation of the consumer. In this case, it is often the case that the above-ground portion of the gas supply pipe to the customer's house is removed and the tip portion is closed, and the gas is directly buried in the ground. The position of such a so-called unsorted supply pipe is recorded as one of the map information for the recent ones. However, there are many things that occurred before that, the location and existence itself are not clear, and it is necessary to investigate this. Therefore, a method has been devised to search for such unsorted supply pipes that are not exposed above the ground.

11 to 14 show a conventional unsorted supply pipe searching method. In this method, first, the gas supply to the main branch pipe, which is the search section, is stopped (step S501 in FIG. 14), and as shown in FIG. 11, the ground 600 near both ends 602, 603 of the search section of the main branch tube 601 is removed. At the same time as excavating, both ends of the main branch pipe in the search section are separated from the upstream / downstream main branch pipe (step S502).

Next, the supply pipe 6 in use in this search section
If there is 04, from this supply pipe 604 to gas meter 605
Is removed (step S503), and the gas remaining inside the supply pipe 604 and the separated main branch pipe 601 is purged (step S504). When there are a plurality of supply pipes in use in this search section, all the supply pipes are purged. Purging is performed by the air flow 60 from the end opening of the supply pipe 604 and the one end opening 606 of the separated main branch pipe 601.
7 or by passing a spherical or cylindrical pig through the tube. The gas 609 in the main branch pipe 601 is pushed out of the main branch pipe from the other end 610 of the main branch pipe 601.
At this time, if the unsorted supply pipe 611 exists in the search section, the gas 61 is not stored in the unsorted supply pipe 611.
2 remains.

Next, as shown in FIG. 12, the main branch pipe 60
The air flow 615 is slowly flowed from the one end opening 606 of the No. 1 (step S505). If there is an unsorted supply pipe in the search section, the gas remaining in it will be diffused by the air flow and will move downstream.

Here, a gas detector 614 is arranged near the other end 610 of the main branch pipe 601 and the concentration of the gas flowing in the main branch pipe 601 is measured (step S506). As a result, when no gas is detected, it is determined that there is no unsorted supply pipe in this section, and when gas is detected, it is determined that there is an unsorted supply pipe. At this time, as shown in FIG. 13, the position of the unsorted supply pipe 611 can be known by examining the time t at which the detected gas concentration reaches its peak and considering the flow velocity of the air flow 615 (step S507). ).

[0007]

As described above, conventionally, in order to search for the unsorted supply pipe 611, it is necessary to excavate two places upstream and downstream of the search section of the main branch pipe 601. It is necessary to stop the gas supply in the section, and many operations such as removing the gas meter from the supply tube in use existing in the section and purging the inside of this supply tube or purging the inside of the main branch pipe 601. Was needed. Further, the gas detection device 604 must be used, which requires skill to handle the gas detection device 604, and it takes a long time to search.

The present invention has been made in view of the above problems, and an object thereof is to provide an unsorted supply pipe searching system capable of searching an unsorted supply pipe with good workability in a short time.

[0009]

The unarranged supply pipe search system according to claim 1 is an unarranged unarranged pipe which is branched from a main pipe for gas transportation buried in the ground. A system for searching a supply pipe, comprising: first transmitting means for transmitting an acoustic signal of a first frequency into the main branch from one end of a search section in the main branch; and a search section in the main branch. A first receiving means provided at the other end of the main receiving pipe for receiving the acoustic signal of the first frequency transmitted from the first transmitting means, and provided at the other end of the search section of the main branch, Responsive to the reception of the first acoustic signal by the first receiving means, the second transmitting means for transmitting the acoustic signal of the second frequency into the main branch, and the first transmitting means. , The other end of the search section in the main branch and unaligned Second receiving means for receiving the acoustic signal of the first frequency reflected by one or both of the supply pipe branching portions and the acoustic signal of the second frequency transmitted from the second transmitting means; Waveform display means for displaying the waveform received by the second receiving means.

In this unsorted supply pipe search system,
And the acoustic signal of the first frequency, which is transmitted from the transmitting means of the first branch, is reflected by the other end of the search section of the main branch and / or one or both of the unarranged supply pipe branches. The second transmitted from the second transmitting means
And the acoustic signal of the frequency of are received by the second receiving means. Then, this received waveform is displayed by the waveform display means, and by analyzing this, the presence or absence and the position of the unsorted supply pipe can be known.

The unsorted supply pipe search system according to claim 2 is the unsorted supply pipe search system according to claim 1, further comprising an unsorted supply in the search section based on a reception result by the second receiving means. A determination means for determining the presence or absence and the position of the pipe and a determination result display means for displaying the determination result by this determination means are provided.

In this unsorted supply pipe search system, the presence / absence and position of the unsorted supply pipe are automatically determined and displayed by the determination means.

The unarranged supply pipe search system according to claim 3 is the unarranged supply pipe search system according to claim 1 or 2, wherein the first transmitting means and the second receiving means are included in one measuring unit. And is connected to an above-ground exposed portion of an existing gas supply pipe provided near one end of the search section of the main branch pipe.

In this unsorted supply pipe search system,
Since it is only necessary to connect the measuring unit containing the transmitting means and the second receiving means to the above-ground exposed portion of the existing gas supply pipe, the gas for excavation for connecting to this main pipe and separation of this main pipe It is possible to search without stopping the supply.

The unsorted supply pipe search system according to claim 4 is the unsorted supply pipe search system according to any one of claims 1 to 3, wherein the first receiving means and the second transmitting means are provided. The gas meter is attached to a gas supply pipe provided near the other end of the search section of the main branch pipe.

In this unsorted supply pipe search system, since a means for responding to the acoustic signal from the measurement unit is built into the existing gas meter, it is necessary to connect such a response means to the main pipe again. Absent.

The unarranged supply pipe search system according to claim 5 is the unarranged supply pipe search system according to any one of claims 1 to 4, wherein the measurement unit is connected to the main branch pipe near one end of the search section. It is configured to be perforated and connected to.

The unsorted supply pipe search system according to claim 6 is the unsorted supply pipe search system according to any one of claims 1 to 4, wherein the measurement unit is provided in a main branch near one end of the search section. Is connected to the opening separated by cutting.

An unsorted supply pipe search system according to claim 7 is the unsorted supply pipe search system according to any one of claims 1 to 6, wherein the first frequency is set to the second frequency.
It is configured to be smaller than the frequency of.

The unarranged supply pipe search system according to claim 8 is for searching an unarranged supply pipe which is not exposed above the ground and which is branched from the main branch pipe for gas transportation buried in the ground. A moving body that travels in the main branch pipe, and a detection means that is mounted on the main branch pipe and that detects a branch portion of various gas pipes that are arranged branching from the main branch pipe; First transmitting means mounted on a moving body and transmitting an acoustic signal of a first frequency toward the branch portion at a position where the detecting means detects the branch portion of the gas pipe, and a branch from the main branch pipe. Included in a gas meter attached to a gas supply pipe arranged as follows, and a first receiving means for receiving an acoustic signal of a first frequency transmitted from the first transmitting means, and a built-in gas meter, The first sound by the first receiving means In response to receiving the signal, and a second transmission means for transmitting an acoustic signal of a second frequency within the branch pipe,
The acoustic signal of the first frequency transmitted from the first transmitting means and reflected by the branch portion of the gas supply pipe or the unarranged supply pipe connected to the main branch pipe, and the acoustic signal of the first frequency transmitted from the second transmitting means. It is provided with a second receiving means for receiving an acoustic signal of two frequencies and a waveform display means for displaying a waveform received by the second receiving means.

In this unsorted supply pipe search system, when a moving body running inside the main pipe detects any branch, an acoustic signal of the first frequency is transmitted from this moving body. Then, the reflected wave at the branch portion and the second wave transmitted from the gas meter that receives the acoustic signal of the first frequency
The acoustic signal of the frequency of is received by the mobile body, and it is possible to know from the received waveform whether or not the branch portion is of the unsorted supply pipe.

The unsorted supply pipe search system according to claim 9 is the unsorted supply pipe search system according to claim 8, further comprising position detection means for detecting the position of the branch portion detected by the detection means, and Based on the detection result of the position detecting means and the reception result of the second receiving means, it is possible to determine whether the branch portion detected by the detecting means is the branch portion of the unsorted supply pipe and the position of the branch portion. It is provided with a determination means for performing and a determination result display means for displaying the determination result by this determination means.

In this unsorted supply pipe search system, the position detecting means and the determining means automatically determine the type and position of the branch portion detected by the moving body.

The unarranged supply pipe search system according to claim 10 is the unarranged supply pipe search system according to claim 9, wherein the waveform display means, the determination means, and the determination result display means are arranged on the ground. The measuring unit is housed in the measuring unit, and the measuring unit and the detecting unit, the first transmitting unit and the second receiving unit mounted on the moving body are connected by a control signal cable. .

[0025]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a schematic configuration of an unsorted supply pipe search system according to an embodiment of the present invention. This system is provided with a supply pipe 1 arranged so as to branch from a main pipe 11 buried in the ground of a search section and to be exposed from the ground surface 17.
2 and 14 are used. The supply pipe 12 is an individual gas supply pipe to the consumer's house, and the gas meter attached to the end of the supply pipe 12 is removed to replace the measuring unit 1 with the gas meter.
3 is attached. However, the supply pipe 12 may be a dedicated search pipe that is arranged in advance. Supply pipe 14
Is also an individual gas supply pipe to the consumer's house, and a gas meter 15 equipped with a response function to the measurement unit 13 is connected to the terminal end thereof. It is preferable that the distance between the supply pipe 12 to which the measurement unit 13 is attached and the supply pipe 14 to which the gas meter 15 is attached is usually about 100 to 200 meters, but if necessary, it is longer within a range that does not affect the search accuracy. It can also be shortened or shortened.

It should be noted that in the present embodiment, 1 is set in this search section.
It is assumed that there are two unsorted supply pipes 18.

FIG. 2 shows the structure of the measuring unit 13 shown in FIG. The measuring unit 13 supplies an acoustic pulse 38 having a predetermined frequency via the supply pipe 12 to the main branch pipe 1.
1 to the transmission section 31 and the main branch pipe 11 to the supply pipe 1
Acoustic pulse 39 sent or returned via 2
Is connected to the receiving unit 32 for receiving the
A frequency discriminator 33 that identifies the frequency of the acoustic pulse received by the receiver 32, and a transmitter 31 and a frequency discriminator 33.
And a transmission / reception control unit 34 that controls transmission / reception,
A waveform display unit 35 which is connected to the transmission / reception control unit 34 and displays a reception waveform, and a predetermined calculation for obtaining the number of unarranged supply pipes and position information thereof and control of other units which are connected to the transmission / reception control unit 34. A CPU (Central Processing Unit) 36 for performing
A position display unit 37 connected to the CPU 36 for displaying a calculation result by the CPU 36 and the like, and connected to the CPU 36
It has a memory 30 for storing information necessary for calculation in the PU 36.

Under the control of the transmission / reception controller 34, the transmitter 31 outputs a single sinusoidal acoustic pulse 38 (having a frequency A) as shown in FIG. 5 (a). . Here, the frequency A is set to about 250 Hz. The waveform display unit 35 is composed of an observation device capable of expressing a phenomenon waveform on a CRT such as an oscilloscope. The waveform display unit 35 may not be built in the measurement unit 13 but may be separately provided outside. The position display unit 37 is composed of, for example, a liquid crystal display device, and is configured to display information obtained by the processing of the CPU 36 (presence or absence of an unsorted supply pipe, position, etc.). The memory 30 stores the time from the transmission unit 31 transmitting the acoustic pulse 38 to the reception unit 32 receiving the acoustic pulse 39 and other necessary information.

FIG. 3 shows a main part of the gas meter 15 shown in FIG. The gas meter 15 includes a reception unit 41 that receives an acoustic pulse 44 sent from the main branch pipe 11 through the supply pipe 14, a transmission unit 42 that transmits an acoustic pulse 45 having a predetermined frequency, a reception unit 41 and a transmission unit. And a transmission / reception control unit 43 that controls 42. The transmission unit 42
When the reception unit 41 receives the acoustic pulse of the frequency A from the measurement unit 13, under the control of the transmission / reception control unit 43, a single sinusoidal acoustic pulse (having a frequency B) is output. There is. Here, the frequency B is approximately 350
It is set to about Hz. The frequency A is set to be lower than the frequency B, because the transmitted sound from the measurement unit 13 needs to travel back and forth within the main branch pipe 11 and propagate for a long distance as described later, so that it is set to a low frequency that is less likely to be attenuated. Is preferable.

The gas meter 15 is provided with a gas flow meter such as a fluidic flow meter and a device such as a shut-off valve for shutting off the gas supply when the gas is abnormally used, in addition to the above-mentioned configuration. , These are omitted in FIG.

The operation of the unsorted supply pipe search system having the above-mentioned configuration will be described with reference to FIGS. 1, 4 and 5. Here, FIG. 4 shows the flow of the operation, and FIG. 5 shows the waveform of the acoustic pulse transmitted and received.

First, prior to starting the search, the CPU 36 of the measuring unit 13 sets the value C of the built-in counter to "0".
To the transmission / reception control unit 34 (step S101).
Instruct to start search. The counter is for counting the number of unsorted supply pipes in the search section, as will be described later. The transmission / reception control unit 34 controls the transmission unit 31 to transmit the acoustic pulse 38 of the frequency A as shown in FIG. 5A (step S102). The acoustic pulse 38 propagates in the supply pipe 12 and the main branch pipe 11,
It reaches the branch portion of the unsorted supply pipe 18, and further reaches the branch portion of the supply pipe 14 to which the gas meter 15 is attached. In these branch portions, the cross-sectional area of the main branch pipe 11 partially increases and the acoustic impedance changes, so that part of the acoustic pulse 38 is reflected and reflected waves 51 and 52 are formed, which are the main branch pipe 11 and the supply pipe. It propagates in 12 and returns to the measurement unit 13.
On the other hand, part of the acoustic pulse 38 (indicated by reference numeral 44) propagates through the supply pipe 14 and reaches the gas meter 15. The acoustic pulse 44 is received by the receiving unit 41 (FIG. 3) in the gas meter 15 and converted into an electric signal. Transmission / reception control unit 43
When the frequency of this received signal is A, it judges that it is a signal from the measurement unit 13 and controls the transmitter 42 to transmit the acoustic pulse 45 of frequency B.

Receiver 32 of measuring unit 13 (FIG. 2)
Receives the reflected waves 51 and 52 of frequency A from the branch portion of the unarranged supply pipe 18 and the branch portion of the supply pipe 14, and the acoustic pulse 45 of frequency B transmitted from the gas meter 15. The acoustic pulse 39 received by the receiving unit 32 is converted into an electric signal and sent to the frequency discriminating unit 33 to discriminate frequencies. The transmission / reception control unit 34 displays these received signals on the waveform display unit 35, and determines the presence / absence of the unsorted supply pipe and its position based on the received signals. Specifically, an acoustic pulse of frequency A is received (step S
103; Y), and when an acoustic pulse of frequency B is received immediately thereafter (step S104; Y), that is, in FIG.
As shown in (b), acoustic pulse of frequency A and frequency B
When a set of (continuously) received acoustic pulses of, the former is determined to be the reflected wave 52 at the branch portion of the supply pipe 14, and the latter is the acoustic pulse 45 from the gas meter 15,
It is determined that there is no unsorted supply pipe between the measurement unit 13 and the gas meter 15 (step S105).

On the other hand, as shown in FIG.
After receiving the acoustic pulse by itself (step S10)
3; Y), when the acoustic pulse of frequency B is not received (step S104; N) and the acoustic pulse of frequency A is received again (step S106; Y), step S103.
Since the acoustic pulse of the frequency A received at is considered to be the reflected wave 51 from the branch portion of the unsorted supply pipe 18, the CPU 36
Stores the reception time in the memory 30 (step S107) and increments the counter value C by 1 (step S108). As a result, the value of the counter becomes "1". Here, when the acoustic pulse of frequency B is received next (step S109; Y), step S109
Since the acoustic pulse of frequency A received in 106 is the reflected wave 52 from the branch portion of the supply pipe 14, and the acoustic pulse of frequency B received in step S109 is considered to be the acoustic pulse 45 from the gas meter 15, the search pulse is within the search section. It is determined that the number of unsorted supply pipes existing in 1 is the value C of the counter, that is, "1". Furthermore, the CPU 36 reads the reception time of the reflected wave 51 from the memory 30, obtains the time difference T from the transmission time of the acoustic pulse 38, and multiplies T by the sound speed to determine the distance from the measurement unit 13 to the unsorted supply pipe 18. Obtain (step S110). Then, the calculated distance is displayed on the position display unit 37 (step S111). Since the speed of sound varies depending on the temperature and the type of gas, the accuracy of distance can be improved by making a correction in consideration of these parameters in advance.

When the acoustic pulse of frequency B is not received in step S109 (step S109; N), the acoustic pulse of frequency A is received again (step S10).
6; Y), since the acoustic pulse of the frequency A previously received in step S106 is considered to be a reflected wave from another branched portion of the unsorted supply pipe, the reception time of the reflected wave is stored (step S107). ), The value C of the counter is incremented by 1 to "2" (step S108). Here, when the acoustic pulse of the frequency B is received next (step S109; Y), the acoustic pulse of the frequency A received the second time in step S106 is from the branch portion of the supply pipe 14, and in step S109. Since the received acoustic pulse of the frequency B is considered to be from the gas meter 15, the number of unarranged supply pipes existing in the search section (that is, between the measurement unit 13 and the gas meter 15) is “2”. At the same time, the memory 30 is referenced and the positions of the two unsorted supply pipes are calculated (step S110), and these are displayed on the position display unit 37 (step S111).

The same applies to the case where there are three or more unsorted supply pipes, and the number and position thereof can be obtained by repeating the processing of steps S106 to S109.

As described above, according to this embodiment, the main branch pipe 1
Since there is no need to separate 1, there is no need to stop the gas supply to the main branch of the relevant section when searching for an unsorted supply pipe, and there is no need to excavate the ground or gas purge, so workability is extremely high. Good. In addition, the measurement unit 13
Since it can be used with a simple operation, it is easier to operate than a conventional gas detection device, no special skill is required, and the time required for searching can be significantly shortened.

In the present embodiment, the measuring unit 13 is connected to the supply pipe 12 at a position where the gas meter is removed. However, the present invention is not limited to this. For example, as shown in FIG. Measuring unit 1 with a part drilled
3 may be directly connected. Further, as shown in FIG. 7, a part of the main branch pipe 11 may be separated, and the measuring unit 13 may be connected to this through a connection adapter 19. However, in these cases, excavation at one location is required.

FIG. 8 shows an unsorted supply pipe searching system in another embodiment of the present invention. This system is arranged on the ground and has a measuring unit 60 that controls the moving body 70, a moving body 70 that runs in the main branch pipe 11, and an access port 91 that is provided in the main branch pipe 11. It is provided with a flexible control cable 90 that connects the moving body 70 and the measurement unit 60. In addition,
The access port 91 can maintain an airtight structure inside and outside the main branch pipe 11 even when the control cable 90 is inserted.

The moving body 70 includes a camera 71 with illumination for detecting an unsorted supply pipe or a branch portion of the supply pipe, a transmission unit 72 for transmitting an acoustic pulse 74 of frequency A into the main branch pipe 11, and a main body. A receiving unit 73 that receives the acoustic pulse 75 reflected from the inner wall surface of the branch pipe 11 or transmitted from the gas meter 15, and a traveling drive unit 74 for traveling the moving body 70.
It has and.

The measuring unit 60 is connected to the transmitting section 72 of the moving body 70 by the control cable 90 and also to the frequency discriminating section 62, the waveform display section 63 and the CPU 64, and the transmitting section 72 and the receiving section 73 of the moving body 70. A transmission / reception control unit 61 for performing transmission / reception control, a frequency discriminating unit 62 connected to the reception unit 73 of the moving body 70 by a control cable 90 for identifying the frequency of the acoustic pulse 75 received by the reception unit 73, and a transmission / reception control unit. A waveform display unit 6 that is connected to the display unit 63 and displays the waveform received by the receiving unit 73 of the mobile unit 70.
3 is connected to the transmission / reception control unit 61 and is connected to the traveling drive unit 74 and the camera 71 of the moving body 70 by the control cable 90, and the position control of the moving body 70 and the position information of the unsorted supply pipe are obtained and displayed. It is provided with a CPU 64 that controls the display on the unit 65 and the like, and a position display unit 65 that is connected to the CPU 64 and displays the position and the like of the unsorted supply pipe.

The other structure is similar to that of FIG. That is, the main configuration of the gas meter 15 is the same as that shown in FIG. 3, and is connected to the supply pipe 14. Further, it is assumed that an unsorted supply pipe 18 is connected to the main branch pipe 11 in this search section.

The operation of the unarranged supply pipe searching system having the above-mentioned structure will be described with reference to FIG.

The moving body 70 is the CPU of the measuring unit 60.
Driving is started according to an instruction from 64 (step S20).
Together with 1), the inner wall surface (upper wall surface) of the main branch pipe 11 is monitored by the camera 71. When any branch is found (step S202; Y), the traveling is stopped by the instruction of the CPU 64 (step S203), and the frequency of the frequency A is transmitted from the transmitter 72 by the instruction of the transmission / reception controller 61.
The acoustic pulse of is transmitted to the branch portion (step S204).

When this branch portion is the unsorted supply pipe 18, the acoustic pulse of frequency A is reflected as it is due to the change in impedance at the branch portion. Further, when the branch portion is the supply pipe 14 controlled by the gas meter 15, a part thereof is reflected at the branch portion and the other part reaches the gas meter 14. When the receiving unit 41 receives the acoustic pulse of frequency A from the moving body 70, the transmission / reception control unit 43 of the gas meter 14 transmits the acoustic pulse of frequency B from the transmitting unit 42.

When the receiving unit 73 of the mobile unit 70 receives the acoustic pulse of the frequency A (step S205; Y) and subsequently receives the acoustic pulse of the frequency B (step S106; Y), the branching unit It is determined that the gas is in the supply pipe 14 to which the gas meter 15 is attached (step S20).
7). On the other hand, when the receiving unit 73 of the mobile body 70 receives only the acoustic pulse of the frequency A and does not receive the acoustic pulse of the frequency B (step S206; N), it is determined that the branch portion belongs to the unsorted supply pipe 18. (Step S208),
The position is displayed by the position display unit 65 (step S209).

In the present embodiment, the camera detects the bifurcation, but the invention is not limited to this. For example, the transmitting unit 72 constantly transmits an acoustic pulse of frequency A while traveling the moving body 70. Then, the receiving section 73 may monitor the reflected wave to detect the branch section. In this case, there is an advantage that the camera is unnecessary.

In this embodiment, the control cable 90 connects the moving body 70 and the measuring unit 60 for remote control. However, remote control by radio waves is also possible. . Further, although the moving body 70 is equipped with only the minimum necessary functions, the measuring unit 6
It is also possible to mount the function of 0 on the mobile unit 70 to make the mobile unit 70 intelligent.

As described above, in this embodiment, the unmoved supply pipe or the branch portion of the supply pipe is directly detected by the moving body running in the main branch pipe, and the position of the moving body is grasped by the measuring unit 60 at any time. As a result, the accuracy of the search can be improved.

In each of the above embodiments, the transmitter / receiver responsive to the acoustic pulse from the measuring unit 13 or 60 is built in the gas meter attached to the existing supply pipe to the customer's house. A dedicated transceiver may be separately prepared, and the gas meter may be removed and the transceiver may be connected. Further, instead of the supply pipe 14 to the consumer's house, a pipe dedicated to searching for an unsorted supply pipe may be provided in advance and a transceiver for response may be connected thereto.

Further, in each of the above embodiments, the number and position of the unsorted supply pipes are automatically determined and displayed, but they are displayed on the waveform display portions 35 and 63 of FIGS. It is also possible for the operator to judge by looking at the received waveform.

[0053]

As described above, according to the first to sixth aspects.
According to the unarranged supply pipe search system described in any one of 1, the information is transmitted from the first transmission means and reflected at the other end of the search section of the main branch and / or one of the unarranged supply pipe branches. The second receiving means receives the acoustic signal of the first frequency and the acoustic signal of the second frequency transmitted from the second transmitting means that has received the acoustic signal of the first frequency, and receives the acoustic signal. Since the waveform is displayed by the waveform display means, the presence or absence and the position of the unsorted supply pipe can be known by analyzing this. Therefore, unlike the conventional case, the work of purging the inside of the main supply pipe and the gas supply pipe to which the gas meter is attached is eliminated, and it is not necessary to use a gas detection device whose operation is complicated, and the search work is efficient and easy. Can be done.

In particular, according to the unsorted supply pipe search system of the second aspect, since the means for automatically determining and displaying the presence and position of the unsorted supply pipe is provided, the search is simpler and shorter. The effect is that it can be done in time.

Further, according to the unarranged supply pipe search system of the third aspect, the measurement unit accommodating the first transmitting means and the second receiving means is connected to the above-ground exposed portion of the existing gas supply pipe. In addition, according to the unsorted supply pipe search system according to claim 4, since the function for responding to the acoustic signal from the measurement unit is built in the existing gas meter, such a response means is provided. There is no need to reconnect the main branch. Therefore, according to the unsorted supply pipe search system according to claims 3 and 4, it is not necessary to stop the gas supply due to the excavation for connecting the measurement unit or the response means or the separation of the main branch pipe, which affects the consumer. There is an effect that the work can be efficiently performed in a short time without giving the above.

Further, in the unarranged supply pipe search system according to any one of claims 8 to 10, when the moving body running in the main branch detects any branch, the first frequency of the moving body is detected from the moving body. Since the acoustic signal is transmitted, the reflected wave at the branch portion and the acoustic signal of the second frequency transmitted from the gas meter that has received the acoustic signal of the first frequency are received by the mobile body, so that reception From the waveform, it is possible to know whether or not the branch portion belongs to the unsorted supply pipe.
In this case, since the detection of the branching portion is directly performed by the moving body, there is an effect that the detection accuracy (particularly the detection position accuracy) is good.

Further, according to the unsorted supply pipe search system of the ninth aspect, the position detecting means and the determining means automatically determine the type and position of the branch portion detected by the moving body. In addition to the effect described in claim 8, there is an effect that a search can be performed more easily and quickly.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an unsorted supply pipe search system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of the measurement unit shown in FIG.

FIG. 3 is a block diagram showing the configuration of the gas meter shown in FIG.

FIG. 4 is a flowchart for explaining the operation of the unsorted supply pipe search system in FIG.

5 is a waveform diagram showing the operation of the unsorted supply pipe search system of FIG.

FIG. 6 is a diagram showing a configuration of an unsorted supply pipe search system according to another embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of an unsorted supply pipe search system according to another embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of an unsorted supply pipe search system according to another embodiment of the present invention.

9 is a block diagram showing a configuration of a measurement unit and a moving body in FIG.

FIG. 10 is a flowchart for explaining the operation of the unsorted supply pipe search system in FIG.

FIG. 11 is a diagram illustrating a conventional unsorted supply pipe search method.

FIG. 12 is a diagram for explaining the content of the unsorted supply pipe search method of FIG. 11.

13 is a diagram showing a detection result of the gas detection device in the unsorted supply pipe search method of FIG.

FIG. 14 is a flowchart for explaining the contents of the unsorted supply pipe search method of FIG.

[Explanation of symbols]

 11 main pipes 12, 14 supply pipes 13, 60 measurement unit 15 gas meter 18 unarranged supply pipes 31, 42, 72 transmitter 32, 41, 73 receiver 33, 62 frequency discriminator 34, 43, 61 transmission / reception controller 35, 63 waveform display unit 36, 64 CPU 37, 65 position display unit 70 moving body 71 camera 90 control cable

Claims (10)

[Claims] 1. A system for searching an unarranged supply pipe that is not exposed to the ground, which is arranged branching from a main branch pipe for gas transportation buried in the ground, wherein the search is performed in the main branch pipe. First transmitting means for transmitting an acoustic signal of a first frequency into the main branch from one end of the section, and the other end of the search section in the main branch, which is transmitted from the first transmitting means. A first receiving means for receiving an acoustic signal of a first frequency, and a second receiving means provided in the other end of the search section of the main branch, and responsive to receiving the first acoustic signal by the first receiving means. Second transmitting means for transmitting an acoustic signal of a second frequency into the main branch, and the other end of the search section in the main branch and the unarranged supply tube branch transmitted from the first transmitting means. First frequency reflected by one or both parts A second receiving means for receiving the acoustic signal and the acoustic signal of the second frequency transmitted from the second transmitting means; and a waveform display means for displaying a waveform received by the second receiving means. An unorganized supply pipe search system characterized by 2. A determination means for determining the presence or absence and the position of an unsorted supply pipe in the search section based on a reception result by the second receiving means, and a determination for displaying the determination result by the determination means. The unsorted supply pipe search system according to claim 1, further comprising result display means. 3. The existing gas, wherein the first transmitting means and the second receiving means are housed in one measurement unit, and the search unit is provided near one end of a search section of the main branch pipe. The unarranged supply pipe searching system according to claim 1 or 2, wherein the system is connected to an exposed part of the supply pipe above the ground. 4. The gas receiving unit, wherein the first receiving unit and the second transmitting unit are incorporated in a gas meter attached to a gas supply pipe provided near the other end of the search section of the main branch pipe. The unsorted supply pipe search system according to any one of claims 1 to 3. 5. The unsorted supply pipe search system according to claim 1, wherein the measurement unit is connected to the main branch pipe near one end of the search section by punching. 6. The unsorted supply pipe search according to any one of claims 1 to 4, wherein the measurement unit is connected to an opening formed by cutting and separating the main branch pipe near one end of the search section. system. 7. The unsorted supply pipe search system according to claim 1, wherein the first frequency is lower than the second frequency. 8. A system for searching for unarranged supply pipes that are not exposed to the ground and that are provided by branching from a main branch pipe for gas transportation buried in the ground. A moving body that travels, a detection means that is mounted on the moving body, and that detects a branch portion of various gas pipes that are arranged branching from the main branch pipe; First transmitting means for transmitting an acoustic signal of a first frequency toward the branch portion at a position where the branch portion of the gas pipe is detected, and a gas supply pipe branching from the main branch pipe. A first receiving means built in the gas meter for receiving an acoustic signal of a first frequency transmitted from the first transmitting means; and a first receiving means built in the gas meter for the first receiving means. In response to receiving the acoustic signal, the second frequency Second transmitting means for transmitting a sound signal into the main branch, and first transmitting means for transmitting the sound signal from the first transmitting means and reflected at a branch portion of the gas supply pipe or the unsorted supply pipe connected to the main branch. Second receiving means for receiving the acoustic signal of the frequency and the acoustic signal of the second frequency transmitted from the second transmitting means, and waveform display means for displaying the waveform received by the second receiving means. An unarranged supply pipe search system characterized by being equipped. 9. The position detecting means for detecting the position of the branch portion detected by the detecting means, and the detecting means based on the detection result by the position detecting means and the reception result by the second receiving means. A determination means for determining whether or not the detected branch portion is the branch portion of the unsorted supply pipe and a position determination of the branch portion, and a determination result display means for displaying a determination result by the determination means are provided. The unsorted supply pipe search system according to claim 8. 10. The waveform display means, the determination means, and the determination result display means are housed in a measurement unit arranged on the ground, and the detection means mounted on the measurement unit and the moving body, 10. The unarranged supply pipe searching system according to claim 9, wherein the first transmitting means and the second receiving means are connected by a control signal cable.