KR102422269B1 - Damage detecting method of buried pipe - Google Patents

Abstract

The present invention relates to a buried pipe damage detection method for detecting damage to a buried pipe buried in the ground. a first step of transmitting radio waves; and a second step of detecting a pipe damage position by receiving radio waves leaking while moving on the ground above the buried pipe.

Description

DAMAGE DETECTING METHOD OF BURIED PIPE

The present invention relates to a technique for detecting damage to a buried pipe.

In general, piping plays a very important role in almost all industrial facilities or general life as a means of transporting fluids and gases. Mainly, the pipe is buried underground, and as time goes by, the pipe thinning or cracking occurs due to the high-temperature and high-pressure fluid flowing through the pipe. It can also cause a pinhole hole in the pipe.

Damage to these piping can result in ground exposure of fluid flowing through the piping, particularly gas exposure, which is accompanied by a gas explosion hazard. Therefore, it is necessary to monitor the presence or absence of damage to these pipes.

However, since these pipes are mainly buried underground, there is a problem in that it is not easy to check the damage of the pipes.

Accordingly, the inventor of the present invention has completed the present invention after long research and trial and error in order to devise a method that can easily and accurately detect the damage of the buried pipe.

The present invention is to detect damage to a buried pipe buried underground, and transmits a long-wavelength radio wave to the buried pipe through an exposed pipe exposed on the ground, and can determine whether or not the buried pipe is damaged by receiving the radio wave from the ground. An object of the present invention is to provide a method for detecting damage to buried piping.

In addition, the present invention is to provide a method for detecting damage to buried piping that is very easy to connect and dismantle the transmitter by separating the exposed pipe end part or the screw-coupled measuring instrument and connecting the coaxial cable to which the transmitting antenna is coupled to transmit radio waves. do.

In addition, an object of the present invention is to provide a method for detecting damage to buried piping that can fundamentally protect users from the risk of piping explosion by transmitting radio waves through a transmitter in a non-explosion-proof area, not an explosion-proof area.

On the other hand, other objects not specified in the present invention will be further considered within the range that can be easily inferred from the following detailed description and effects thereof.

According to an embodiment of the present invention, in the buried pipe damage detection method for detecting damage to the buried pipe buried underground,

a first step of transmitting an electric wave through a first pipe exposed on the ground, connected to the exposed first pipe, and transmitting an electric wave inside a buried pipe buried underground; and

Provided is a method for detecting damage to a buried pipe, comprising a second step of detecting a location of pipe damage by receiving radio waves leaking while moving on the ground above the buried pipe.

According to an embodiment of the present invention, the first step is

The radio wave generated from the radio wave transmitter located in the non-explosion-proof area may be transmitted to the exposed first pipe in the explosion-proof area through a cable, and the radio wave transmitted to the exposed pipe may be transmitted to the buried pipe.

According to an embodiment of the present invention, the cable may comprise a coaxial cable.

According to an embodiment of the present invention, the exposed first pipe,

a measuring instrument screwed to the first pipe to measure at least one of pressure, temperature, and flow rate in the buried pipe; and

a valve for controlling the movement of gas to the meter;

The first step is

locking the valve;

removing the screwed instrument and connecting the cable;

opening the valve; and

Transmitting the radio wave from the radio transmitter through the cable may be sequentially performed.

According to an embodiment of the present invention, the method may further include replacing a gasket of a second pipe that is exposed to the ground but is not the first pipe and includes a gasket with an EMI blocking gasket.

According to an embodiment of the present invention, the first step is

It may include transmitting radio waves through the plurality of exposed first pipes.

According to an embodiment of the present invention, the first step is

The frequency of the radio wave transmitted to the buried pipe may be 30 ~ 300KHz.

According to an embodiment of the present invention, the radio waves transmitted to the buried pipe transmit radio waves having a frequency within a range of 30 to 300 KHz, and a plurality of radio waves whose frequencies are sequentially decreased may be transmitted.

According to an embodiment of the present invention, the radio wave transmitted to the buried pipe may be transmitted by dividing the radio wave having a frequency greater than 300 KHz through an oscillation frequency divider.

According to an embodiment of the present invention, the first step is

It may include periodically transmitting radio waves having the same frequency.

According to an embodiment of the present invention, when checking the radio wave having the same frequency periodically transmitted in the first step in the second step,

In the radio wave reception in the second step, the radio wave can be received through the directional antenna.

By using the buried pipe damage detection method according to the present invention, it is possible to easily and accurately determine whether the buried pipe is damaged by transmitting a long-wavelength radio wave to the buried pipe through the exposed pipe exposed on the ground and receiving the radio wave from the ground.

In addition, by separating the instrument screwed to the exposed pipe and connecting the coaxial cable to transmit radio waves, the connection and disassembly of the transmitter are very easy.

In addition, by transmitting radio waves through a transmitter in a non-explosion-proof area, not an explosion-proof area, it is possible to fundamentally protect the user from the danger of the pipe exploding.

On the other hand, even if it is an effect not explicitly mentioned herein, it is added that the effects described in the following specification expected by the technical features of the present invention and their potential effects are treated as described in the specification of the present invention.

1 is a view showing a configuration for transmitting a radio wave from a transmitter located in a non-explosion-proof area to a buried pipe buried in the ground through an exposed pipe located in an explosion-proof area for a method for detecting damage to a buried pipe according to the present invention.
2 is a view showing an exposed pipe including a measuring instrument to which a cable to transmit radio waves is coupled.
FIG. 3 is a view showing the separation of the instrument of FIG. 2 and the connection of a transmitter and a cable.
FIG. 4 is a diagram illustrating that a radio wave transmitted from a transmitter is transmitted to a buried pipe, and a radio wave leaked through a pinhole of the buried pipe is received by a receiver.
5 is a flowchart of a method for detecting damage to a buried pipe according to the present invention.
6 is a view showing a specific procedure for transmitting radio waves in the buried pipe damage detection method according to the present invention.
7 is a diagram illustrating a process from oscillating and transmitting radio waves.
8 is a diagram illustrating a process of receiving and analyzing radio waves.
9 is a diagram illustrating transmitting radio waves through a plurality of transmitters and receiving them through a receiver.
10 is a view showing the use of an EMI radio wave blocking gasket to block leakage of the exposed pipe.
It is revealed that the accompanying drawings are exemplified as a reference for understanding the technical idea of the present invention, and the scope of the present invention is not limited thereby.

In the description of the present invention, if it is determined that the subject matter of the present invention may be unnecessarily obscured as it is obvious to those skilled in the art with respect to related known functions, the detailed description thereof will be omitted.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, an embodiment of the buried pipe damage detection method according to the present invention will be described in detail with reference to the accompanying drawings. A duplicate description will be omitted.

1 is a diagram showing a configuration for transmitting radio waves from a transmitter located in a non-explosion-proof area to a buried pipe buried in the ground through an exposed pipe located in an explosion-proof area for a method for detecting damage to a buried pipe according to the present invention.

5 is a flowchart of a method for detecting damage to a buried pipe according to the present invention.

1 and 5, the method for detecting damage to the buried pipe 200 according to the present invention transmits radio waves inside the buried pipe 200 buried in the ground through the first pipe 100 exposed on the ground. and a second step of detecting the location of pipe damage by receiving radio waves leaking while moving on the ground above the buried pipe 200.

That is, one of the main features of the present invention is to transmit radio waves through the exposed pipe.

As shown in FIG. 1, the ground can be divided into an explosion-proof area and a non-explosion-proof area, and the explosion-proof area where the exposed pipe is located has a possibility of generating a hazardous atmosphere by flammable or combustible gas or vapor.

Transmitting radio waves in such an explosion-proof area may be a very dangerous situation for users. Therefore, the present invention is to transmit radio waves through the transmitter 10 in a non-explosion-proof area, not an explosion-proof area.

A fence (F) is usually installed to surround the explosion-proof area, but it is preferable for the user to transmit radio waves in a non-explosion-proof area outside the fence.

Referring to FIG. 1 in more detail, the cable 11 is connected to the exposed pipe, and the transmitter 10 is connected to the connected cable 11 again, thereby transmitting a radio wave from the transmitter 10. At this time, the transmitter 10 is located in a non-explosion-proof area.

Exposed pipes are mainly located within the explosion-proof area, and by transmitting radio waves from the non-explosion-proof area outside the explosion-proof area, it is possible to prevent accidents such as gas explosion caused by radio wave transmission in advance.

In the explosion-proof area, mainly exposed pipes are located, and the exposed pipes are equipped with a measuring instrument (E) that measures the flow rate, temperature, pressure, etc. of gas flowing through the pipe.

2 is a view showing an exposed pipe including a measuring instrument (E) to which the cable 11 to transmit radio waves is coupled.

2 includes a regulator R for adjusting the medium pressure to a low pressure, and a measuring instrument E for measuring the pressure before and after the regulator R is provided. The radio wave is transmitted through the measuring instrument (E) connected to the pipe exposed in this way.

Looking closely at FIG. 2 , a valve is formed between the exposed first pipe 100 and the measuring instrument E, in which case the measuring instrument E is screwed to the exposed first pipe 100 . As such, the present invention can easily separate the measuring instrument (E) screwed to the exposed first pipe 100 and easily connect the cable 11 again, thereby greatly improving the convenience and efficiency of the operation.

That is, by releasing the screw coupling of the screw (N) coupled measuring instrument (E), and coupling the screw thread formed at the end of the coaxial cable (11), etc. to the released part, release of the measuring instrument (E) and the coaxial cable (11) connection can be very easy.

On the other hand, it is necessary to lock the valve so that the fluid flowing inside the pipe does not move to the outside when the screw (N) of the measuring instrument (E) is disconnected and the screw (N) of the coaxial cable 11 is coupled.

That is, after locking the valve first, disconnecting the screw (N) of the meter (E), coupling the screw (N) of the coaxial cable (11) to the first pipe (100), and then proceeding in the order of opening the valve.

Figure 3 is a view showing the separation of the instrument (E) of Figure 2, and the transmitter 10 and the coaxial cable 11 are connected. FIG. 4 is a diagram illustrating that the radio wave transmitted from the transmitter 10 is transmitted to the buried pipe 200 , and the radio wave leaked through the pinhole PH of the buried pipe 200 is received by the receiver 20 .

3 and 4, as shown in FIG. 3, the transmitter 10 transmits radio waves through the coaxial cable 11 screwed to the exposed pipe. In more detail, the radio wave is transmitted into the exposed first pipe 100 through the antenna A coupled to the end of the coaxial cable, and the transmitted radio wave S passes through the first pipe 100 and the buried pipe 200 is buried. will be transmitted until

When the radio wave transmitted to the buried pipe 200 passes through the buried pipe 200 and encounters a damaged part, particularly the pinhole PH, it may leak to the outside through the pinhole PH. At this time, the receiver 20 receives a leaked radio wave while moving on the ground of the buried pipe 200 . Through this, it is possible to determine the damage to the buried pipe 200 .

5 is a flowchart of a method for detecting damage to the buried pipe 200 according to the present invention, and FIG. 6 is a view showing a specific procedure for transmitting radio waves in the method for detecting damage to the buried pipe 200 according to the present invention.

When the process of transmitting the radio wave to the buried pipe 200 through the transmitter 10 and receiving the radio wave through the receiver 20 will be described again with reference to FIGS. 5 and 6 , first the first pipe exposed to the ground The location of pipe damage is detected by transmitting radio waves inside the buried pipe 200 buried in the ground through 100 and receiving radio waves leaking while moving the upper part of the buried pipe 200 on the ground.

To explain this in more detail, first, the valve of the exposed first pipe 100 is closed, and the meter E connected to the first pipe 100 is removed. After that, the cable 11 - in this case, the cable 11 may be a coaxial cable 11 - is connected to the part where the instrument (E) is removed, and then the valve is opened. When a radio wave is transmitted through the transmitter 10 after opening the valve, the radio wave at this time rides on the cable 11 , passes through the first pipe 100 and is transmitted to the buried pipe 200 .

7 is a diagram illustrating a process from oscillating and transmitting radio waves.

As shown in FIG. 7, in the process of transmitting radio waves according to the present invention, a frequency is oscillated, an oscillation frequency is divided, and then amplified and modulated to output a modulated wave through a long wave transmitting antenna.

At this time, a periodic radio wave is transmitted by transmitting a signal through a periodic signal generator through a control signal.

The operation of the transmitter 10 may be turned on/off through the wireless Wi-Fi receiver 20 for remote control, and a periodic signal may be transmitted by controlling the periodic signal generator through the operation control unit.

In this case, the synthesis of radio waves can be induced through the plurality of transmitters 10 . To this end, the operation control unit synchronizes the plurality of transmitters 10 and induces the synthesis of radio waves to increase signal strength.

As all transmitters 10 within a certain area are operated simultaneously, the oscillation frequency division can be identically synchronized by allowing the oscillation frequency sequential controller to operate at the same time as all transmitters 10 .

In addition, the oscillation frequency sequential controller may control the frequency divider to sequentially up/down the transmission frequency to use a wide range of frequency bands.

The oscillation frequency divider divides radio waves of 300KHz or higher to create and transmit a long wave band (30KHz to 300KHz).

For example, if 3MHz frequency is oscillated, 300Khz by dividing by 10 through the oscillation frequency divider, 150Khz by dividing 3Mhz by 20, 100Khz by dividing 3Mhz by 30, long wave can be used.

The reason for using a frequency and a long wave having such a wide range is that the frequency of the radio wave passing through is different depending on the depth of the pipe burial of the buried pipe 200 and the medium of the ground, asphalt, concrete, and the like.

In addition, since the frequency of the passing radio wave varies according to the medium of the ground, radio waves of various frequencies are transmitted. After all, by oscillating a radio wave of a large frequency and dividing it to oscillate radio waves of various frequencies, the radio wave leaking from the pinhole (PH) of the buried pipe 200 can be received regardless of the medium of the ground or the depth of the pipe burial. do.

In this case, the transmission of radio waves includes periodic signals including on/off and transmits radio waves, so that it is possible to accurately determine whether a received radio wave is a transmitted radio wave. There are various radio waves in addition to the transmitted radio waves on the ground, and it is to distinguish these radio waves from the radio waves leaked from the pinhole PH of the buried pipe 200 .

8 is a diagram illustrating a process of receiving and analyzing radio waves.

As shown in Figure 8, the long wave LF (long wave = 30khz ~ 300khz) receiver 20, the radio wave transmitted from the transmitter 10 passes through the medium (the depth of the pipe and the medium of the ground, asphalt concrete, concrete), Although distorted and attenuated, the signal of the receiver 20 can be amplified and restored through a detector. It is checked whether such a signal wave is a transmitted signal through spectrum analysis, and if the transmitted signal is confirmed, it can be confirmed that radio wave leakage occurs in the buried pipe 200 buried underground in the corresponding part.

If the transmitted signal is confirmed, then a directional antenna can be used to receive radio waves. By receiving radio waves in the received direction through the directional antenna, it is possible to more accurately determine the position of radio wave leakage.

At this time, the receiver 20 may be installed in a vehicle and move on the buried pipe 200 to detect leaked radio waves. In areas where it is difficult to operate a vehicle, it is possible to receive radio waves while operating a portable device.

FIG. 9 is a diagram illustrating transmission of radio waves through a plurality of transmitters 10 and receiving them through a receiver 20 .

As shown in FIG. 9 , a radio wave is transmitted through a plurality of transmitters 10 , that is, the first transmitter 10 and the second transmitter 30 , and by transmitting radio waves having the same frequency, the receiver 20 It is possible to increase the size of the received signal. To this end, the plurality of transmitters 10 may be remotely controlled through Wi-Fi and turned on/off at the same time.

Although only two transmitters 10 are disclosed in FIG. 9 , three or more transmitters 10 may be used.

That is, by simultaneously transmitting radio waves having the same frequency in several places, the signal size of the received radio waves is increased, so that spectral analysis of leaked radio waves can be much easier.

10 is a view showing the use of an EMI radio wave blocking gasket to block leakage of the exposed pipe.

As shown in FIG. 10, in the case of an exposed pipe exposed on the ground but not in an explosion-proof area, that is, when it is not an exposed pipe transmitting through the transmitter 10, radio waves leak through the connection part of this pipe. In order to block radio waves exposed through the second pipe 300 exposed in this way, the present invention may use an EMI blocking gasket.

That is, by replacing the gasket at the connection part of the second pipe 300 with the EMI blocking gasket, the leakage of radio waves from the connection part of the second pipe 300 is blocked, and through this, the damaged part in the buried pipe 200 more accurately. can be detected.

The protection scope of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the protection scope of the present invention cannot be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

10: transmitter, first transmitter
30: second transmitter
11: cable
20: receiver
100: first pipe
200: buried pipe
E: instrument
F: fence
V: valve
N: screw
R: regulator
PH: pinhole
300: second pipe

Claims (11)

In the buried pipe damage detection method for detecting damage to the buried pipe buried underground,
A first step of transmitting an electric wave through the first pipe exposed on the ground, connected to the exposed first pipe and the inside of the buried pipe buried in the ground; and
and a second step of detecting a pipe damage position by receiving radio waves leaking while moving on the ground above the buried pipe,
The first step is
Transmitting the radio wave generated from the radio wave transmitter located in the non-explosion-proof area to the exposed first pipe in the explosion-proof area through a cable, and transmitting the radio wave transmitted to the exposed pipe to the buried pipe,
The exposed first pipe,
a measuring instrument screwed to the first pipe to measure at least one of pressure, temperature, and flow rate in the buried pipe; and
a valve for controlling the movement of gas to the meter;
The first step is
locking the valve;
removing the screwed instrument and connecting the cable;
opening the valve; and
Transmitting the radio wave from the radio transmitter through the cable is sequentially performed,
The first step is
Simultaneously transmitting radio waves through the plurality of exposed first pipes,
The first step is
The frequency of the radio wave transmitted to the buried pipe is 30 ~ 300KHz,
The radio wave transmitted to the buried pipe transmits a radio wave having a frequency within the range of 30 to 300 KHz, and transmits a plurality of radio waves whose frequencies are sequentially decreased,
The radio wave transmitted to the buried pipe is transmitted by dividing the radio wave having a frequency of 3 MHz through an oscillation frequency divider,
The first step is
comprising periodically transmitting radio waves having the same frequency;
When checking the radio wave having the same frequency periodically transmitted in the first step in the second step,
The radio wave reception in the second step receives the radio wave through a directional antenna,
The second step is
Selecting an intermediate frequency of the received radio wave through a bandpass filter, amplifying the radio wave of the selected intermediate frequency, and performing frequency spectrum analysis to identify a periodic signal,
A method for detecting damage to buried piping. delete According to claim 1,
The cable is characterized in that it comprises a coaxial cable,
A method for detecting damage to buried piping. delete According to claim 1,
The buried pipe damage detection method further comprising replacing a gasket of a second pipe that is exposed to the ground but is not the first pipe and includes a gasket with an EMI blocking gasket. delete delete delete delete delete delete

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