KR100568608B1 - Leakage test apparatus for sewage pipe using air pressure and methods using the same - Google Patents

Abstract

The present invention relates to a watertight test apparatus for a sewage pipe using air pressure and a method thereof, and more specifically, after measuring an air pressure change amount in a closed watertight test section, a leak amount can be easily obtained by using a correlation between the air pressure change amount and the leak amount. The present invention relates to a watertight test apparatus and its construction method. To this end, the watertight test apparatus for sewage pipe using the air pressure of the present invention is connected to each other by a predetermined connection member, a pair of frames having a cylindrical shape; A packer installed along the circumferential direction on the outer surface of each frame and expanded to be in close contact with the inner surface of the sewer pipe by inflow of compressed air; An air inlet unit for selectively injecting compressed air into a watertight test section closed by a packer installed in each frame; A pressure measuring member for measuring an air pressure change amount in the watertight test section; And a calculation unit calculating a leakage amount by using a correlation between a previously input air pressure change amount and a leakage amount in the watertight test section.

Air pressure, leakage, packer, sewer pipe, watertight test

Description

Leakage test apparatus for sewage pipe using air pressure and methods using the same

1 is a perspective view showing a watertight test apparatus for sewage pipe using air pressure according to a preferred embodiment of the present invention.

2 and 3 are cross-sectional views showing that the watertight test apparatus of FIG.

4 is a detail view of portion A of FIG.

5 is a configuration diagram showing an auxiliary unit of the watertight test apparatus of FIG.

6 to 8 is a flow chart showing the watertight test method of the sewage pipe using the air pressure which is another aspect of the present invention.

<Explanation of symbols for the main parts of the drawings>

10,11 Frame 12: Packer

20: air injection unit 30: pressure measuring member

40: calculator 60: auxiliary unit

80: sewer pipe 90: connection member

100: watertight test device for sewage pipe using air pressure

The present invention relates to a watertight test apparatus for a sewage pipe using air pressure and a method thereof, and more specifically, after measuring an air pressure change amount in a closed watertight test section, a leak amount can be easily obtained by using a correlation between the air pressure change amount and the leak amount. The present invention relates to a watertight test apparatus and its construction method.

In general, sewage pipes buried underground such as concrete fume pipes, vinyl chloride pipes made of synthetic resin, and conduits have defects such as cracks, breakage, or disconnection due to aging of the pipe itself, ground subsidence, or earth pressure change from the ground. Can be generated. When such a defect occurs in the sewage pipe, the wastewater flowing inside the sewage pipe flows out into the ground through the defective portion. Spilled waste water contaminates soil and groundwater.

The method for repairing the faulty sewer line is appropriately selected depending on the nature of the damaged area and the ambient conditions. In the case of relatively small sewer pipes having a diameter of 200-600 mm, grouting or lining methods are employed because workers cannot enter the sewer pipes. In order to apply the method, it is necessary to first find out which part of the sewer pipe is damaged by watertight test or camera survey.

The watertight test is performed by a watertight test apparatus. The watertight test is a method of measuring the amount of water lost, that is, the amount of leakage for a predetermined time after filling the water so as to ensure a head of about 1m in the sewer pipe connecting the manhole and the manhole.

However, watertight tests using water have the problems of securing a large amount of water and treating the used water. In addition, there is a problem that can not be tested because the water is frozen in the cold winter.

In order to solve this problem, a watertight test method using compressed air has been proposed. Watertight test using compressed air is disclosed in Korean Patent No. 296173 and the like.

In the above method, first, the watertight test apparatus is positioned inside the sewer pipe, and then expanded by supplying compressed air to the first expansion member and the second expansion member. Next, compressed air is injected into the sealed space formed by the expanded first and second expansion members, and the compressed air is measured for leakage.

The method has the advantage that it is possible to pinpoint the damaged part in the sewer pipe between the manhole and the manhole.

However, the method can only know whether compressed air leaks, and since the leak amount cannot be accurately known, there is a problem in that the degree of defects in the sewage pipe or the watertightness of the joints of the sewage pipe is not accurately known.

The watertight test apparatus of the sewage pipe using the air pressure and the method of the present invention was devised to solve the above problems, and after measuring the air pressure change in the sealed watertight test section, the water leakage is easily made by using the correlation between the air pressure change and the leakage amount It is an object of the present invention to provide a watertight test apparatus and a method for obtaining the same.

In order to achieve the above object, a watertight test apparatus for sewage pipe using air pressure according to the present invention includes: a pair of frames connected to each other by a predetermined connecting member and having a cylindrical shape; A packer installed on an outer surface of each frame along a circumferential direction and expanded to be in close contact with an inner surface of a sewer pipe by inflow of compressed air; An air inlet unit for selectively injecting compressed air into a watertight test section closed by packers installed in the frames; A pressure measuring member measuring an air pressure change amount of the watertight test section; And a calculating unit calculating a leak amount by using a correlation between the air pressure change amount previously input and the leak amount of the watertight test section.

Preferably, the packer is attached to the frame only in a portion of the portion in contact with the frame, it can be elastically expanded by the inflow of compressed air.

Here, the watertight test apparatus further includes an auxiliary unit for obtaining a correlation between the air pressure change amount and the leakage amount, wherein the auxiliary unit has a sealed accommodation space formed therein, and selectively opened and closed on one side thereof. Sealing member is formed with an outlet for communicating with the outside; A water injection unit selectively injecting water so that a predetermined water pressure is formed in the accommodation space; A compressor member for selectively injecting compressed air to form a predetermined air pressure in the accommodation space; And an air pressure measuring member for measuring the air pressure of the accommodation space.

The watertight test method of the sewer pipe using the air pressure which is another aspect of the present invention, (a) a pair of frames connected to each other by a connecting member, and the inner surface of the sewage pipe by the inflow of compressed air installed on the outer surface of each frame Moving the watertight test device having a packer expanded to be in close contact with the watertight test section of the sewer pipe; (b) injecting compressed air into the packer to expand the packer to be in close contact with the inner surface of the sewer; (c) injecting compressed air into the watertight test section closed by expansion of the packer; (d) measuring an air pressure change amount of the watertight test section for a predetermined time; (e) calculating a leakage amount of the watertight test section by using the air pressure change amount.

Preferably, the step (e) comprises the steps of: (e1) obtaining a leak area of the watertight test section by using the air pressure change amount; And (e2) calculating a leak amount of the watertight test section by using the leak area.

More preferably, the watertight test method, before the step (a) further comprises the step of obtaining a correlation between the leakage area and the leakage amount, the leakage area and the air pressure change amount, the correlation between the leakage area and the leakage amount Obtaining the step, (a1) supplying water so that a predetermined water pressure is formed in the receiving space of the sealing member; (a2) obtaining a leakage amount discharged for a predetermined time by opening the outlet formed in the sealing member to form a leakage area of a predetermined size; And (a3) varying the leak area by changing the open area of the outlet to obtain a correlation between the leak area and the leak amount by repeating steps (a1) and (a2). Correlating the air pressure change amount may include: (a1 ') supplying compressed air to the accommodation space to form a predetermined air pressure after discharging all the water in the accommodation space; (a2 ') discharging the compressed air by opening the outlet to form a leak area having a predetermined size, and measuring an air pressure change during a predetermined time; And (a3 ') obtaining a correlation between the leakage area and the air pressure change by repeating steps (a1') and (a2 ') by varying the leakage area by changing the open area of the outlet.

Here, the packer is preferably bonded to the frame only in a part of the portion in contact with the frame, it is possible to elastically expand by the inflow of compressed air.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a perspective view showing the watertight test apparatus of the sewer pipe using the air pressure according to a preferred embodiment of the present invention, Figures 2 and 3 is a cross-sectional view showing that the watertight test apparatus of FIG.

Referring to the drawings, the watertight test apparatus 100 includes a pair of frames 10 and 11, a packer 12 provided on an outer circumferential surface of each frame 10, 11, and a frame 10 and 11. An air inlet 20 for injecting compressed air into the watertight test section S, which is a space between the packer 12, a pressure measuring member 30 for measuring the air pressure in the watertight test section S, and a watertight test It is provided with a calculation unit 40 for obtaining the leakage amount by using the air pressure change amount in the section (S).

The pair of frames 10 and 11 are hollow cylindrical members, respectively. One side of the frame 10, 11 is provided with a flat plate member 13, 14, respectively.

The pair of frames 10, 11, that is, the front frame 10 and the rear frame 11 are connected to each other by the connecting member 90. The packer 12 is installed on the outer surface, that is, the perimeter of the frame 10, 11.

The front frame 10 and the rear frame 11 have the same structure except for the flat plate members 13 and 14. The plate members 13 and 14 are bolted to the frames 10 and 11. Therefore, when the front frame 10 or the rear frame 11 is replaced, it is advantageous because the frames 10 and 11 except for the flat plate members 13 and 14 have mutual compatibility.

Meanwhile, the towing ropes 92 and 93 are connected to the frames 10 and 11. Preferably, tow ropes 92 and 93 are connected to the front end of the front frame 10 and the rear end of the rear frame 11. Traction ropes 92 and 93 are wound by an external winch (not shown) to move device 100 within sewer line 80.

At least two frequent wheels 15 are installed at one end of the frame 10 and 11, and at least two steering wheels 16 are installed at the other end.

The wheel 15 may be driven by a drive motor (not shown) installed in the frames 10 and 11. Therefore, the watertight test apparatus 100 may be towed by the traction ropes 92 and 93 and may be moved by a drive motor.

The steering wheel 16 consists of four rollers 16a. Four rollers 16a are rotatably mounted to the support 16c by the pins 16b. That is, the roller 16a can rotate and revolve about the pin 16b. Therefore, the steering wheel 16 allows the device 100 to easily move forward even when there are steps or obstacles at the bottom of the sewage pipe 80. Such steering wheel 16 is disclosed in Korean Patent Registration No. 358586.

Preferably, the frame 10, 11 is provided with a lighting member 17, and the photographing member 18 for photographing the inside of the sewer pipe (80). The photographing member 18 photographs the watertight test section S and transmits the photographed member to the external display member 42. The photographing member 18 is preferably rotatable 360 degrees so as to photograph the entire inner surface of the sewer pipe 80.

The connecting member 90 connects a pair of frames 10 and 11 to each other. Conventional ropes or strings may be used as the connecting member 90. Therefore, since the distance between the frames 10 and 11 can be adjusted, the length of the watertight test section (S) can be adjusted.

Preferably, the connecting member 90 is integrated with the first air inlet tube 22. This point is described below.

The packer 12 is installed along the circumferential direction on the outer surface of the frame 10, 11. The packer 12 is expanded to be in close contact with the inner surface of the sewage pipe 80 by the compressed air introduced from the outside. To this end, the packer 12 is preferably made of rubber capable of high expansion. More preferably, the packer 12 is formed with a plurality of wrinkles (not shown). When compressed air flows into the packer 12, the packer 12 may be highly expanded while the wrinkles are unfolded. Compressed air is introduced into the packer 12 by the first air inlet tube 22.

Preferably, the packer 12 is adhered to the frames 10 and 11 only in a part of the portion contacting the frames 10 and 11. As shown in FIG. 4, when the packer 12 is adhered to the frames 10 and 11 only in a part 12a, the amount of expansion of the packer 12 is increased because the area that can be expanded is increased. As the amount of expansion of the packer 12 increases, the apparatus 100 may be used in sewage pipes having various diameters.

The air injection unit 20 injects compressed air selectively into the watertight test section (S), and the packer 12.

The air injection unit 20 includes an air compressor 21, a first air injection pipe 22 for supplying compressed air to the packer 12, and a second air injection for supplying compressed air to the watertight test section S. The tube 24 is provided. The compressed air is made in the air compressor 21 and then supplied through the first and second air injection pipes 22 and 24. The first and second air inlet pipes 22 and 24 may be provided with a pressure control valve (not shown) for controlling the inflow of compressed air.

The first air inlet pipe 22 penetrates through the front member 14 of the rear frame 11 and is connected to the packer 12 of the front frame 10. In this case, the first air injection pipe 22 may be integrally coupled with the connection member 90 in the space between the frames 10 and 11.

The pressure measuring member 30 measures the pressure in the space between the frames 10 and 11, that is, the watertight test section (S). The measured pressure is displayed on the external display member 42. Preferably, the pressure measuring member 30 is installed on the front member 14 of the rear frame (11). The pressure measuring member 30 and the display member 42 are connected to each other by the pressure measuring line 32.

The calculation unit 40 calculates the leakage amount of the watertight test section (S) by using the air pressure change amount measured by the pressure measuring member (30).

The correlation between the air pressure change amount and the leaked area and the correlation between the leaked area and the leaked amount is input to the calculation unit 40. That is, the calculation unit 40 obtains the leaked area using the air pressure change amount, and calculates the leaked amount using the leaked area. The correlation between the air pressure change and the leaked area and the correlation between the leaked area and the leaked amount is described below.

Preferably, the operation unit 40 displays on the display member 42 whether the sewage pipe 80 has passed or not by comparing the calculated amount of leakage with the allowable amount of leakage prescribed by law. As described above, since the leakage amount of the sewer pipe 80 is automatically calculated by the operation unit 40, and whether or not the sewer pipe 80 passes is automatically displayed, it is possible to prevent the operator from operating the watertight test result.

Meanwhile, in the present specification, 'leakage area' means an area where water can be leaked to the outside in the watertight test section (S), and 'leakage amount' refers to the amount of water outflowing through the leaking area.

Preferably, the watertight test apparatus 100 includes an auxiliary unit having a correlation between the air pressure change amount and the leak amount. As shown in FIG. 5, the auxiliary unit 60 includes a sealing member 61 having an accommodating space 61a therein, a water injection unit 62 for selectively injecting water into the accommodating space 61a, and And a compressor member 63 for selectively injecting compressed air into the accommodation space 61a, and an air pressure measuring member 64 for measuring the air pressure in the accommodation space 61a.

The sealing member 61 includes a receiving space 61a formed therein and an outlet 61b for selectively communicating the receiving space 61a with the outside. Preferably, the outlet 61b may adjust its open area, that is, the leak area.

 The water injection part 62 selectively supplies the water stored in the storage tank 62a to the accommodation space 61a. Preferably, the water injection portion 62 supplies water so that a predetermined water pressure is formed in the accommodation space (61a). The predetermined water pressure is measured by the head measurement member 62b installed to communicate with the accommodation space 61a.

The water supplied to the accommodation space 61a is discharged to the outside when the outlet 61b is opened. At this time, a correlation between the amount of water discharged and the open area of the outlet 61b can be obtained. In other words, the correlation between the leakage amount and the leakage area can be obtained.

The compressor member 63 is installed to communicate with the accommodation space 61a, and selectively supplies compressed air to the accommodation space 61a. Injection of the compressed air is performed in the absence of water in the accommodation space (61a).

The air pressure measuring member 64 measures the amount of air pressure change in the accommodation space (61a). That is, the air pressure measuring member 64 measures the change in air pressure as the compressed air is discharged through the outlet 61b. At this time, a correlation between the air pressure change amount and the open area of the outlet 61b can be obtained. In other words, the correlation between the change in air pressure and the leakage area can be obtained.

As described above, when the auxiliary unit 60 is used, the correlation between the leakage amount and the leakage area and the correlation between the air pressure change amount and the leakage area can be obtained, and then the correlation between the air pressure change amount and the leakage amount can be obtained.

Then, a process of performing a watertight test using the watertight test apparatus 100 according to the preferred embodiment of the present invention will be described.

First, the correlation between the leakage amount and the leakage area is obtained using the auxiliary unit 60.

Water is injected using the water injection part 62 so that a predetermined water pressure is formed in the accommodation space 61a (S10 of FIG. 6). The water pressure is measured by the head head measuring member 62b. Preferably, water is injected into the head measuring member 62b such that a head of about 1 m is formed.

Subsequently, by opening the outlet 61b to form a leakage area of a predetermined size, the amount of leakage discharged for a predetermined time is determined (S20).

Next, the step S10 and step S20 are repeated by changing the open area of the outlet 61b, that is, the leak area. When the amount of leakage discharged for a predetermined time according to the area of leakage is obtained, a correlation between the area of leakage and the amount of leakage can be obtained (S30). The correlation is input to the operation unit 40 (S40).

The correlation between the change in air pressure and the amount of leakage is obtained by the following procedure.

First, compressed air is injected to form a predetermined air pressure in the accommodation space 61a (S60 of FIG. 7). Compressed air is injected in the absence of water in the receiving space (61a).

Subsequently, the amount of air pressure change during a predetermined time is measured by opening the outlet 61b to form a leak area having a predetermined size (S70). The air pressure is measured by the air pressure measuring member 64.

Next, the steps S60 and S70 are repeated by changing the open area of the outlet 61b, that is, the leak area. By measuring the change in air pressure for a predetermined time according to the leak area, a correlation between the leak area and the change in air pressure can be obtained (S80). The correlation is input to the operation unit 40 (S90).

The process of measuring the leakage of the watertight test section using the correlation obtained in the above process is as follows.

First, the watertight test apparatus 100 is moved to the watertight test section (S) (S110). The movement of the watertight test apparatus 100 may be performed by winding the towing ropes 92 and 93 connected to the frames 10 and 11 using a winch (not shown). Alternatively, the watertight test apparatus 100 can be moved by frequently driving the wheels 15 using a drive motor (not shown).

On the other hand, the distance between the front frame 10 and the rear frame 11, that is, the distance of the watertight test section (S) can be adjusted by adjusting the length of the connecting member (90).

After the watertight test apparatus 100 is moved to the watertight test section S, compressed air is supplied to the packer 12 through the first air inlet pipe 22. Packer 12 is expanded to supply compressed air to be in close contact with the inner surface of the sewer pipe (80) (S120).

When the expansion of the packer 12 is completed, compressed air is injected to form a predetermined air pressure in the watertight test section S through the second air inlet tube 24 (S130). The compressed air is discharged to the outside when the damaged part of the sewage pipe 80 or the joint 82 of the sewage pipe is defective. At this time, the pressure measuring member 30 measures the change in air pressure for a predetermined time (S140) and transmits it to the external display member 42 and the calculator 40.

The operation unit 40 calculates a leak amount using the correlation input in advance in steps S40 and S90. In addition, the operation unit 40 compares the amount of leakage to the allowable amount of leakage prescribed by law and displays on the display member 42 whether the sewer pipe passes.

On the other hand, in the above described using the water-tight test device 100 in the sewage pipe 80 as an example, the water-tight test device 100 may be applied to other pipes, such as water pipes.

The watertight test apparatus for sewage pipes using the air pressure and the method thereof according to the present invention have the following effects.

First, after measuring the air pressure change in the closed watertight test section, the leakage can be easily obtained by using the correlation between the air pressure change and the leakage.

Second, because the packer is highly expandable, it can be applied to sewer pipes of various diameters.

Third, since the leakage amount is automatically calculated by the calculating unit and whether or not the sewer pipe is passed is displayed on the display member, it is possible to prevent the data from being manipulated by the operator.

Claims (7)

A pair of frames connected to each other by a predetermined connecting member and having a cylindrical shape; A packer installed on an outer surface of each frame along a circumferential direction and expanded to be in close contact with an inner surface of a sewer pipe by inflow of compressed air; An air inlet unit for selectively injecting compressed air into a watertight test section closed by packers installed in the frames; A pressure measuring member measuring an air pressure change amount of the watertight test section; An auxiliary unit for obtaining a correlation between the air pressure change amount and the water leakage amount in the watertight test section; And And a calculating unit calculating a leak amount using a correlation between the air pressure change amount and the leak amount obtained by the auxiliary unit. The auxiliary unit, A hermetically sealed accommodation space formed therein, and one side of which is selectively opened and closed, and a sealing member having an outlet for communicating the accommodation space with the outside; A water injection unit selectively injecting water so that a predetermined water pressure is formed in the accommodation space; A compressor member for selectively injecting compressed air to form a predetermined air pressure in the accommodation space; And, And an air pressure measuring member for measuring the air pressure of the accommodation space. The method of claim 1, The packer has a flat oval shape in cross section and is expanded to a donut shape by the inflow of compressed air, and adheres to the frame only at a central portion of the portion facing the frame, so that the air pressure can be elastically expanded by the inflow of the compressed air. Watertight test apparatus for sewage pipes used. delete delete delete (a ') calculating a correlation between a leaked area and a leaked amount and a correlation between the leaked area and a change in air pressure; (a) a watertight test apparatus having a watertight test apparatus having a pair of frames connected to each other by a connecting member and a packer installed on an outer surface of each frame and expanded to be in close contact with an inner surface of a sewer pipe by inflow of compressed air; Moving to a test interval; (b) injecting compressed air into the packer to expand the packer to be in close contact with the inner surface of the sewer; (c) injecting compressed air into the watertight test section closed by expansion of the packer; (d) measuring an air pressure change amount of the watertight test section for a predetermined time; (e) calculating a leak area of the watertight test section using the air pressure change amount using the correlation obtained in (a '), and calculating a leak amount of the watertight test section using the leaked area; Step (a '), (a1) supplying water so that a predetermined water pressure is formed in the receiving space of the sealing member; (a2) obtaining a leakage amount discharged for a predetermined time by opening the outlet formed in the sealing member to form a leakage area of a predetermined size; And (a3) varying the leakage area by changing the open area of the outlet to obtain a correlation between the leakage area and the leakage amount by repeating steps (a1) and (a2); Obtaining a correlation between the leakage area and the air pressure change amount, (a1 ') discharging all the water in the accommodation space, and supplying compressed air to the accommodation space to form a predetermined air pressure; (a2 ') discharging the compressed air by opening the outlet to form a leak area having a predetermined size and measuring an air pressure change amount for a predetermined time; And (a3 ') obtaining a correlation between the leakage area and the air pressure change by repeating steps (a1') and (a2 ') by varying the leakage area by changing the open area of the outlet; Watertight test for sewage pipe using air pressure. The method of claim 6, The packer has a flat oval shape in cross section and is expanded to a donut shape by the inflow of compressed air, and adheres to the frame only at a central portion of the portion facing the frame, so that the air pressure can be elastically expanded by the inflow of the compressed air. Watertight test method using sewage pipe.

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