JP3074085B2 - Method of measuring defective lining after lining repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transferring resin from one end of a main pipe such as a gas pipe or a water pipe buried underground and a service pipe, and lining the inner surface of the main pipe with the resin. BACKGROUND OF THE INVENTION The present invention relates to an inspection method after repairing a lining repair method, and more particularly to an inspection method that can be easily performed by using pipeline length measurement data using a pulsed sound wave that is usually performed when a lining repair method is performed.

[0002]

2. Description of the Related Art Conventionally, resin is pumped or sucked with a pig or air or water from one end of a main pipe such as a gas pipe or a water pipe buried underground and a service pipe. Lining repair method of repairing lining with resin has been put to practical use. Although there are various methods in these methods, the resin used is a two-liquid mixed-curing type epoxy resin having a relatively high viscosity, so that only one work can be performed up to about 3 meters at a time. Therefore, in the case of a long main pipe, the lining repair work is repeated several times, and the lining repair is carried out for the entire length. In some cases, it was a defective spot that narrowed the road. If such a defective coating film occurs, it is necessary to immediately take measures such as pig passing treatment before the resin solidifies. Must be identified.

[0003]

However, conventionally, there is no appropriate method for measuring a defective lining after the lining repair method is applied. Therefore, in order to perform a reliable lining repair, it is necessary to determine whether there is a defective portion after the lining repair operation. The only way to do this was to go through the pigs, which required extra steps.

[0004] The present invention provides a method for measuring a defective lining which can be specified immediately after the lining repair method is carried out easily and without the need for a special device. The task is to do so.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above technical object, the present invention provides a lining repair method for transferring a resin from one end of a main pipe and lining the inner surface of the main pipe. In the method of specifying the presence or absence of a defective portion of the coating film and its position, the oscilloscope waveform obtained at the time of measuring the pipe length using pulsed acoustic waves before the lining repair method is recorded, and the pulse is again applied after the lining repair method. Measure the pipe length using sound waves, compare the oscilloscope waveform obtained with the oscilloscope waveform obtained at the time of pipe length measurement before the construction of the lining repair method, and compare the oscilloscope waveform with the difference in the waveform. It is characterized by measuring the presence or absence of a defective part and its location.

[0006]

According to the present invention, it is possible to measure the presence or absence of a defective portion of a lining coating film and the location thereof by using the pipe length measurement data using a pulsed sound wave which is usually performed at the time of performing the lining repair method. it can. That is, if the lining repair is performed completely without any defective parts, the oscilloscope waveform obtained at the time of measuring the pipeline length using pulsed sound waves before the lining repair method is the same as the oscilloscope waveform after the lining repair method is applied It becomes a waveform,
If there is a defective portion in the lining coating film, an unexpected reflected wave is generated at the defective portion.

Therefore, the oscilloscope waveform obtained at the time of measuring the pipe length using the pulsed acoustic wave before the lining repair method is recorded on a data recorder or an XY plotter, and compared with the oscilloscope waveform after the lining repair method. The difference between the waveforms becomes apparent, and the presence or absence of the defective portion of the lining coating film and its position can be identified from the analysis of the difference between the waveforms.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a pipe length measuring method using a pulsed sound wave used in the present invention. This is also a general method for measuring a pipe length for determining a resin amount which is generally performed prior to a lining repair method. Are the same.

FIG. 1 shows a means for measuring the entire length of the service pipe 2 for lining and repairing the inner surface of the service pipe 2 connected to the conduit 1. That is, the meter standing pipe 2a at the ground part of the service pipe 2 is cut and the acoustic unit 10 is connected. The acoustic unit 10 is provided with a speaker 13 and a microphone 14 in a case 11, and the speaker 13 generates a pulse sound wave by a sound wave generator 17.

[0010] The pulsed sound wave emitted from the speaker 13 enters the service pipe 2, is reflected by the elbow 4 and the Q3 portion of the service pipe 2, returns and is caught by the microphone 14.
The reflected wave caught by the microphone 14 is transmitted to a frequency required by the bandpass filter 18, that is, the speaker 1.
The signal passes through only the same frequency such as the pulse wave emitted from No. 3 to remove noise, and enters the CPU 21. Based on the synchronization signal from the synchronization signal generator 19, the CPU 21 compares the time when the pulse sound wave is output from the speaker 13 and the time when the reflected wave is input from the microphone 14, and determines the difference between the time and the sound speed in the service pipe 2. The length of the service pipe 2 is calculated and displayed on the display 23.

On the other hand, the oscilloscope 25 has a pulsed sound wave from the sound wave generator 17 and a bandpass filter 18.
The reflected wave from is input and displayed. This displayed waveform
It can be recorded on the data recorder 28, and X-
It can be visually recorded on the Y plotter 30.

FIG. 2 shows a specific example of the reflected waveform of the pulsed sound wave before the lining repair of the service pipe 2. The reflected wave in the pipeline system having the elbow 4 and the tee 3 as shown in FIG. 2A is a transmission pulse 40 of the loudspeaker 13 and an elbow 4 from the left like the waveform of the oscilloscope 25 shown in 2-b.
And the reception pulse 42 from the Q3 are arranged on the horizontal axis (time axis), and t1 and t2 indicate the reflection time from the elbow 4 and the Q3, respectively. By multiplying these reflection times by the speed of sound in the service pipe 2, the distances to the elbows 4 and the chi 3 can be determined.

FIG. 3 shows a specific example of the reflected waveform of the pulsed sound wave after the lining repair of the service pipe 2. Among the reflected waveforms at 3-b in FIG. 3, the reception pulse 41 and the reception pulse 42 are from the elbow 4 and Q3 of 3-a, respectively.
It is the same as the case of the reflected waveform of the pulsed sound wave before the lining repair described in FIG. 2, but if there is a defective lining 9 as shown in 3-a of FIG. The reflection of the sound wave occurs, and the reception pulse 44 corresponding to the defective lining portion 9 as shown in FIG.
Appears on the oscilloscope 25.

Therefore, 2-b in FIG. 2 and 3-b in FIG.
By contrast, the presence of the reception pulse 44, in other words, the presence of the lining defect portion 9 can be easily confirmed. The comparison between 2-b in FIG. 2 and 3-b in FIG.
The graph drawn by the -Y plotter 30 may be compared, or both data may be stored in the data recorder 28, and the difference between the two data may be calculated by an appropriate calculating means to obtain the reception pulse 44.
Only the calculation may be performed.

[0015]

According to the present invention, the lining is constructed by simply adding the data recorder 28 or the XY plotter 30 to the pipeline length measuring device using pulsed sound waves which is usually used at the time of the lining repair method. The presence or absence of a defective portion of the coating film and its position can be quickly specified. In addition, the measurement is very easy because it only records the oscilloscope waveform obtained at the time of measuring the pipe length using pulsed sound waves before and after the lining repair method is applied to the data recorder or XY plotter and compares it. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a pipe length measuring method using a pulsed sound wave used in the present invention.

FIG. 2 is a specific example of a reflected waveform of a pulsed sound wave before the lining repair of the service pipe 2;

FIG. 3 is a specific example of a reflected waveform of a pulsed sound wave after the lining repair of the service pipe 2;

[Explanation of symbols]

 2 Service pipe 3 Chi 4 Elbow 10 Sound unit 13 Speaker 14 Microphone 17 Sound wave generator 18 Bandpass filter 19 Synchronous signal generator 21 CPU 25 Oscilloscope 28 Data recorder 30 XY plotter 40 Transmission pulse 41, 42, 44 Receive pulse

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-25648 (JP, A) JP-A-5-228435 (JP, A) JP-A-63-141674 (JP, A) JP-A-61-25 29757 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05D 1/00-7/26 G01B 17/00 F16L 55/16

Claims (1)

(57) [Claims] 1. A method for specifying the presence or absence of a defective portion of a lining coating film and the position thereof after a lining repair method for transferring a resin from one end of the main pipe and lining the inner surface of the main pipe. Record the oscilloscope waveform obtained at the time of pipeline length measurement using pulsed acoustic waves before the lining repair method construction, and again perform the pipeline length measurement using the pulsed acoustic waves after the lining repair method construction,
Compare the oscilloscope waveform obtained with the oscilloscope waveform obtained at the time of measuring the pipe length before the lining repair method, and use the difference in the waveform to determine the presence or absence of a defective portion of the lining coating film and its location. A method for measuring a defective lining after the lining repair method is applied.