KR101282845B1 - Leakage monitoring type lugeon test apparatus - Google Patents

Abstract

PURPOSE: A leakage detection type ground hydraulic test device is provided to improve test performance of a ground hydraulic test by grasping errors of the ground hydraulic test in real time. CONSTITUTION: A leakage detection type ground hydraulic test device comprises a main water pipe (20), a packer pipe (12), an expansion packer film, and a pressure pipe. A main packer film (13) and an auxiliary packer film (14) are separated from each other and are individually installed on both ends of the packer pipe. An inlet (15) is formed in the packer pipe of the separation part between the main packer film and the auxiliary packer film. A leakage detecting pipe (16) is connected to the inlet. The water injected into the main water pipe is leaked through a gap between the main packer film and a borehole wall and is discharged to the leakage detecting pipe.

Description

Leakage detection ground hydraulic test device {LEAKAGE MONITORING TYPE LUGEON TEST APPARATUS}

The present invention installs a water pipe (20) in the borehole during the field test to measure the permeability of the ground and the test section (L) closed with a packer (packer) (10) after the water pipe (20) The present invention relates to a ground hydraulic test apparatus for forcibly injecting water at a predetermined pressure and observing the flow rate thereof to calculate a luge value. The main packer membrane 13 and auxiliary are provided at both ends of the packer tube 12. The packer membrane 14 is installed to be spaced apart from each other, and the packer tube 12 of the spaced apart portion is provided with a leak detection tube 16 connected to the ground, the main packer membrane 13 of the water injected into the water pipe 20 And leaks between the boreholes and walls.

The lumen value indicates the amount of injection per liter of injection length in liters at the pressure of 10kg / ㎠ and it is an important factor to determine the permeability characteristics of the ground with relatively low permeability. It is used as basic data of design throughout the construction such as construction and underground structures.

Most field tests for permeability of the ground are performed by forming boreholes at the test target points and observing the inflow or outflow of groundwater in the boreholes, as shown in FIG. 1. In this case, in order to shorten the test time, a ground pressure test is performed to observe the inflow and outflow of water in the ground through pressurized water through the water pump (29) and the water pipe (20). The process is outlined as follows.

First, it forms a borehole at the test point. In the case of soil layer, it is difficult to maintain the hollow wall, so casing can be installed, and then the ground water pump 29, the fluid pressure applying device 39, the flow meter, the hydraulic pressure gauge, etc. The apparatus is constructed, and a main water pipe 20 having a packer 10 installed at a distal end thereof is inserted into a borehole.

The packer 10 attached to the distal end of the main water pipe 20 is formed by joining both ends of a flexible cylindrical cyst to the outer circumferential surface of the packer pipe 12, which is a metal pipe, and is a ground fluid. It is connected to the pressure applying device 39 and the pressure tube 30 is inflated as in the enlarged in the ellipse of Figure 1 is in close contact with the borehole wall, thereby ensuring the watertightness of the test section (L).

The working fluid for inflating the packer 10 may be water or compressed air. When water is used as the working fluid, the fluid pressure applying device 39 is a pump, and when the compressed air is used as the working fluid, the fluid pressure is applied. The applying device 39 may be applied with a compressor.

When the expansion of the packer 10 is completed and the sealing of the test section L is completed, forced injection of water is started by the feed pump 29, and then a predetermined procedure for changing the injection pressure stepwise according to the detailed test method. As the test proceeds, the lumen value is calculated by measuring the flow rate per unit area.

On the other hand, Figure 2 is composed of two packers 10, the upper and lower double packer (double paker) ground to position the discharge port of the water pipe 20 between the upper packer (10a) and lower packer (10b) Figure 1 shows the pressure test situation, in the case of the single-packer (single paker) method of FIG. 1 described above, the test section is set to the packer 10 contact point at the bottom of the borehole, whereas the double-packer type ground pressure test of FIG. The test section is set between the (10a) contact and the lower packer 10b contact.

As can be seen through the enlarged excerpt of Figure 2, in the double packer ground hydraulic test bar pressurized water must be made to the borehole space between the upper packer (10a) and the lower packer (10b), each of the separate pressure pipe (30a) , The upper packer 10a and the lower packer 10b connected to each other are mounted at both ends of the connecting pipe 18, and the water pipe 19 is cut in the connecting pipe 18 so that the connection pipe 18 is embedded in the connecting pipe 18. Water discharged from the water inlet pipe 20 is discharged into the test hole in the borehole through the water inlet 19. In addition to the water pipe forming connector 18, the upper packer (10a), such as the hole 18 in the form of perforated pipes and Various connection forms of the lower packer 10b are possible.

In the ground hydraulic test, regardless of the single packer and double packer system, it is very important to maintain the test section (L) through the packer 10.

If the water injected during the test leaks between the packer 10 and the vacant wall due to poor adhesion between the packer 10 and the borehole wall, the amount of main water is over-measured to reflect the permeability characteristics of the test section (L) soil. Accuracy is seriously degraded.

Therefore, it is necessary to ensure close contact between the borehole wall and the packer 10 throughout the test. As is well known, uniformly forming the diameter and verticality of the borehole drilled in the ground uniformly over the entire borehole extension Since it is very difficult, there is a significant level of error in the ground due to poor sealing in the test section.

As in the other ground tests, the ground hydraulic test also needs to determine whether there is an error and cook the test results accordingly in order to derive meaningful test results. There was a limit to whether or not there was a mistake.

The present invention was devised in view of the above-described problems, and is connected to a main pump (29), a feed pipe (20) for injecting water into a borehole, a packer pipe (12), a packer pipe with a built-in feed pipe (20) The pressure packer 30 which is connected to the flexible packer film 11 having both ends joined to the outer circumferential surface of the 12 and the fluid applying device 39 on the ground, and pressurizes the working fluid between the packer film 11 and the packer pipe 12. In the ground hydraulic test apparatus consisting of, the main packer film 13 and the auxiliary packer film 14 are installed at both ends of the packer pipe 12, respectively, spaced apart from each other, the main packer film 13 and the packer pipe ( The main pressure pipe 31 is connected between the 12, the auxiliary packer membrane 14 and the packer tube 12 is connected to the auxiliary pressure tube 32, the working fluid is pumped, the main packer membrane 13 and the auxiliary packer In the packer tube 12 of the separation portion between the membrane 14, the inlet port 15 is formed in communication with the outside of the packer tube 12, the inlet 15 is connected to the leak detection tube 16, It is injected into the water pipe 20 is a leak detection type ground pressure test device, characterized in that the water leaked between the main packer membrane 13 and the borehole wall is discharged to the leak detection tube (16).

In addition, the main packer film 13 and the auxiliary packer film 14 are spaced apart from each other at both ends of the packer pipe 12, respectively, and the space between the main packer film 13 and the packer pipe 12 and the auxiliary packer 12. A pressure passage 17 is formed to connect the space between the membrane 14 and the packer tube 12. A pressure tube 30 is connected to the pressure passage 17 so that the working fluid is pressurized, and the main packer membrane 13 is formed. And the packer tube 12 of the separation portion between the auxiliary packer film 14 is formed in the inlet port 15 to communicate with the inside and outside the packer tube 12, the inlet 15 is connected to the leak detection tube 16 , It is injected into the water pipe 20 is a leak detection type ground pressure test device, characterized in that the water leaked between the main packer membrane 13 and the borehole wall is discharged to the leak detection tube (16).

Through the present invention, it is possible to determine in real time whether the ground hydraulic test is wrong, thereby improving the test degree of the ground hydraulic test, it is possible to accurately and efficiently design and construction of the related construction projects.

1 is a diagram illustrating a conventional single packer ground hydraulic test
Figure 2 is a diagram illustrating a conventional double packer ground hydraulic test
Figure 3 is a perspective view of the main portion of the present invention
Figure 4 is an explanatory view of a single packer ground pressure test to which the present invention is applied
5 is a representative cross-sectional view of an embodiment of the present invention in which a pressure passage is formed;
Figure 6 is an explanatory view of a double packer ground pressure test to which the present invention is applied
Figure 7 is a partial cutaway perspective view of an embodiment of the present invention to which the built-in internal water supply pipe is applied

Detailed configuration and operation of the present invention will be described with reference to the accompanying drawings.

First, Figure 3 is a perspective view showing the main components of the present invention, as shown, the present invention in the construction of the packer 10 to be mounted to the water pipe 20, the main packer film 13 and auxiliary By dividing the inflated body into a packer film 14, it forms a kind of leak detection space and installs an inlet 15 and a leak detection tube 16 connecting the leak detection space with the ground, It is configured to check the borehole tightness.

That is, as in the enlarged in the ellipse of Fig. 4 which is an explanatory view of a single packer ground hydraulic test to which the present invention is applied, the main packer film 13 and the auxiliary packer film 14 are mutually connected at both ends of the packer tube 12, respectively. The main pressure pipe 31 is connected between the main packer membrane 13 and the packer tube 12, and the auxiliary pressure tube 32 is connected between the auxiliary packer membrane 14 and the packer tube 12. The working fluid is pressurized, and an inlet port 15 is formed in the packer tube 12 in the packer tube 12 at an interval between the main packer membrane 13 and the auxiliary packer membrane 14 and communicates with the outside. 15, the leak detection tube 16 is configured to be connected.

Therefore, when water injected into the test section in the borehole through the main water pipe 20 leaks through the main packer membrane 13 and the borehole wall, the water flows into the leak detection tube 16 through the inlet 15, and eventually, It is drained through the top of the ground leak detection tube 16, and by measuring the pressure or flow rate of the leak detection tube 16, it is possible to determine whether the leak during the ground hydraulic test.

Meanwhile, FIG. 5 illustrates an embodiment of the present invention in which the pressure passage 17 is formed, and as shown, the main pressure pipe 31 for driving the main packer film 13 and the auxiliary packer film 14. The auxiliary packer membrane 13 and the auxiliary packer membrane 14 may be simultaneously driven through a single pressure tube 30 without separately provided with the auxiliary pressure tube 32.

That is, as in the enlarged part of the ellipse of FIG. 5, a pressure passage connecting the space between the main packer film 13 and the packer tube 12 and the space between the auxiliary packer film 14 and the packer tube 12 ( 17) and the pressure pipe 30 is connected to the pressure passage 17, the working fluid conveyed from the above-mentioned fluid pressure application device 39 is connected to the main packer film 13 through the pressure passage 17. Branching flows into the auxiliary packer membrane 14, thereby allowing the expansion of the primary packer membrane 13 and the auxiliary packer membrane 14 through a single pressure tube (30).

As such, the piping of the pressure pipe 30 and the like can be simplified through the configuration of the pressure passage 17. When the present invention is applied to the double packer ground hydraulic test as shown in FIG. Solve complex piping problems that may arise.

On the other hand, in the double packer ground hydraulic test shown in Fig. 6, since the leakage direction of the upper and lower side of the test section (L) is different, the upper auxiliary packer film 14a is as in the single packer ground hydraulic test of Figure 4 Although the upper main packer film 13a is positioned above, the lower auxiliary packer film 14b is positioned below the lower main packer film 13b.

In the double packer ground pressure test applied to the present invention, as shown in Figure 6, the inlet (15a, 15b) is formed in two places, the upper and lower, each of the inlet (15a, 15b) separate leak detection tube (16a, 16b) ) Can be connected to determine whether the test section (L) above or below the leak.

7 is a built-in piping such as the leak detection tube 16, the main pressure pipe 31 and the auxiliary pressure pipe 32 in the water supply pipe 20 to enable a stable in-hole injection of the hydraulic test apparatus.

Through the present invention as described above, it is possible to determine in real time whether the ground hydraulic test is wrong, thereby improving the test accuracy of the ground hydraulic test.

10: packer
11: packer film
12: Packer tube
13: main packer film
14: auxiliary packer film
15: inlet
16: leak detection tube
17: pressure passage
18 connector
19: water outlet
20: water supply pipe
29: water pump
30: pressure tube
31: main pressure pipe
32: auxiliary pressure pipe
39: fluid pressure applying device

Claims (2)

A flexible packer membrane, which is connected to a main pump (29) and is connected to the outer circumferential surface of the packer tube (12), the packer tube (12) in which the pumping tube (20) is built, and the pumper tube (12). (11), wherein the ground hydraulic pressure test apparatus comprising a pressure pipe (30) connected to the ground fluid pressure applying device (39) to pump a working fluid between the packer film (11) and the packer pipe (12),
Main packer film 13 and auxiliary packer film 14 are spaced apart from each other at both ends of packer tube 12;
The main pressure tube 31 is connected between the main packer membrane 13 and the packer tube 12, and the auxiliary pressure tube 32 is connected between the auxiliary packer membrane 14 and the packer tube 12 to pressurize the working fluid. ;
In the packer tube 12 at the spaced apart portion between the main packer membrane 13 and the auxiliary packer membrane 14, an inlet 15 is formed to communicate with the outside of the packer tube 12, and a leak detection tube is provided at the inlet 15. (16) is connected, the leak detection type ground hydraulic pressure test device, characterized in that the water leaked through the main packer membrane 13 and the borehole wall is injected into the water supply pipe 20 is discharged to the leak detection tube (16) .
A flexible packer membrane, which is connected to a main pump (29) and is connected to the outer circumferential surface of the packer tube (12), the packer tube (12) in which the pumping tube (20) is built, and the pumper tube (12). (11), wherein the ground hydraulic pressure test apparatus comprising a pressure pipe (30) connected to the ground fluid pressure applying device (39) to pump a working fluid between the packer film (11) and the packer pipe (12),
Main packer film 13 and auxiliary packer film 14 are spaced apart from each other at both ends of packer tube 12;
A pressure passage 17 is formed to connect a space between the main packer membrane 13 and the packer tube 12 and a space between the auxiliary packer membrane 14 and the packer tube 12, and the pressure tube 17 has a pressure tube. 30 is connected and the working fluid is pressurized;
In the packer tube 12 at the spaced apart portion between the main packer membrane 13 and the auxiliary packer membrane 14, an inlet 15 is formed to communicate with the outside of the packer tube 12, and a leak detection tube is provided at the inlet 15. (16) is connected, the leak detection type ground hydraulic pressure test device, characterized in that the water leaked through the main packer membrane 13 and the borehole wall is injected into the water supply pipe 20 is discharged to the leak detection tube (16) .

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