KR200418112Y1 - An apparatus preventing a water leakage of borehole by water expanding material - Google Patents

Abstract

The present invention relates to a borehole leakage preventing device using a water-expansion member, by installing a tubular body with a water-expansion member in the borehole, the water-expansion member is expanded by water or moisture in the borehole and the rock layer wall surface of the borehole The outer surface of the tubular body is more tightly fixed, there is an effect that can easily and effectively prevent the leakage of the borehole.

Water expansion member, bore hole, leak, prevention device

Description

An apparatus preventing a water leakage of borehole by water expanding material}

1 is a cross-sectional view showing a conventional borehole leakage preventing device,

Figure 2 is an exploded perspective view of the tubular body and the water expansion member according to an embodiment of the present invention,

3 is a cross-sectional view showing a coupling state of FIG.

4 is a cross-sectional view showing a state of use of FIG.

<Explanation of protection for main parts of drawing>

10: tube 12: seating groove

20: water expansion member 30: casing

The present invention relates to a leak prevention device of a borehole for obtaining an underground heat source, and more specifically, to install a tubular body having a water-expansion member at a predetermined position of the borehole, and the boundary layer of the soil layer or each ground layer above the rock bed layer. The present invention relates to a borehole leakage preventing device using a water expanding member that prevents groundwater from leaking in a borehole.

Generally, fossil fuels such as coal, petroleum, natural gas, or nuclear fuel are used as energy sources used to obtain heating and cooling hot water.

However, fossil fuels pollute the environment due to various pollutants generated during the combustion process, and nuclear fuel generates harmful substances such as water pollution and radioactivity, and these energy sources have a limited amount of reserves. Therefore, in recent years, the development of alternative energy to replace this has been actively progressed.

Among these alternative energy, natural energy such as wind, solar, geothermal, etc. has been studied for a long time, and air-conditioning and heating system using it have been installed and used. These natural energy are infinite energy with little influence on environmental pollution and climate change. On the other hand, due to the drawback of very low energy density, increasing the density and converting it into a usable form has become a core task of natural energy technology development.

Among these natural energy technologies, a heat exchange system is known, which uses geothermal heat as a heat source for cooling and heating. This is a heat pump installed with a heat exchanger to recover heat from the ground at a temperature of 10 to 20 ° C or to discharge heat into the ground. It is a technology used as a heat source.

As such, heat exchange systems using underground heat sources are known to have the highest energy efficiency among all cooling and heating technologies.

In order to install the heat exchange system using the above-mentioned underground heat source, the borehole must be drilled first. When drilling the borehole, it is essential to install a facility to prevent constant pollution due to the development of groundwater and to prevent the groundwater from leaking into the upper layer of the rock bed. need.

In connection with this, a lot of research has been conducted, but the conventionally implemented method is as shown in FIG. 1.

In the detailed description of the present invention, including FIG. 1, the ground layers are simply divided into soil layers, boundary layers, and rock layers in order to concisely express the technical idea of the present invention, but the actual layers are topsoil, gravel, mixed stone, martha, weathered rock, It may be divided into a soft rock layer, a normal rock layer, a hard rock layer.

Conventionally, the drilling of boreholes for obtaining geothermal energy is carried out by installing drilling rigs with a large diameter at the place where the groundwater veins are located. The drilling rigs are removed when they reach the planned depth by reaching the rock layer. Then, the outer casing (3) was attached to prevent the soil from decaying inside the heart well, and the excavation bit was replaced with a small diameter to excavate the rock bed again and excavated until the groundwater vein was caught.

At this time, a stage is formed at the point where the large diameter and the small diameter meet, and in order to prevent the inflow of contaminated surface water or the leakage of the borehole, the inner casing 1 is inserted to the end of the digging bit conversion point of the small diameter and the outside is installed. Cement mortar 2 is poured between the casing 3 and the inner casing 1 to finish the treatment.

However, the work process using the cement mortar as described above has a problem that is complicated, economically expensive.

In order to improve the above problems, Korean Patent Laid-Open Publication No. 1999-0064635 (groundwater intake borehole pollution prevention construction method and apparatus thereof) and Korean Patent Laid-Open Patent Publication No. 2002-0045935 (high depth grouting pipe apparatus and grouting method for groundwater treatment) It is difficult to inject the cement mortar through the narrow inner and outer casing gap to the upper rock layer according to the topography because the cement mortar is injected into the upper part of the rock layer. There has been a fundamental limitation that can not know.

In particular, the Republic of Korea Patent Publication No. 2002-0045935 discloses a method for closely contacting the shielding tube for supporting the grouting liquid using the high-pressure expansion tube to the underground heart wall and the monitoring camera is installed on the lower end of the high-pressure expansion tube to the shielding tube Means for monitoring the leakage of grouting liquid have been disclosed, but the prevention of borehole contamination and leakage prevention is too complicated for the purpose of achieving the purpose, and it is difficult to realize properly and also has the problem of economic feasibility.

The present invention was devised to solve the above problems, and by putting only one casing to prevent the earth and sand from collapsing into the borehole, and by providing a water-expanding member at a predetermined position in the tube located inside the borehole, It is an object of the present invention to provide a device for effectively preventing the leakage of the borehole.

In order to achieve the above object, the present invention is a leak-proof tube installed inside the bore hole to prevent the groundwater inside the bore hole to leak from the upper rock bed layer; Coupled to a predetermined position of the tube is characterized in that the borehole leakage preventing device using a water expansion member including a water expansion member to expand only by contact with the surrounding water or moisture to prevent the gap between the bore hole.

Here, the water-expandable member that expands only by contact with water or moisture in the surrounding is a water-expandable rubber-elastic index material. In particular, an index material made by combining sodium bentonite raw material and butyl rubber is preferable.

Sodium Bentonite is montmorillonite in which Na ions are adsorbed on the bentonite surface as exchange ions, and are known to be more water-expandable than other bentonites. In other words, high-quality sodium bentonite reacts with water, expanding 13 to 16 times its original volume and absorbing water up to 5 times its weight.

Due to the excellent water expandability of sodium bentonite as described above, the index material using the same has been widely used in civil engineering and construction.

In the present invention, a water repellent material made by synthesizing rubber with a hydrophilic material such as sodium bentonite is formed in a tape shape or a ring, and attached to a predetermined position of the tube to prevent leakage of boreholes simply and effectively. Done.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Figure 2 is an exploded perspective view of the tubular body and the water-expandable member according to an embodiment of the present invention, Figure 3 is a cross-sectional view showing a coupling state of Figure 2, Figure 4 is a cross-sectional view showing a state of use of FIG.

In an embodiment of the present invention, the predetermined position at which the water expansion member 20 is coupled is an outer circumferential surface of the tubular body 10, and the outer circumferential surface of the tubular body to which the water expanding member is coupled is seated in a circumferential direction 12. ) Is formed, and the water-expandable member 20 is seated and coupled to the seating groove 12 of the tubular body.

Here, the water-expandable member 20 has a ring shape as shown by a water-expandable rubber elastic index material made by synthesizing a hydrophilic material and rubber. However, as already mentioned above, it may also be wound several times in a tape shape.

In the case where the water-expandable member is shaped like a ring, it is preferable that the water-expandable member is formed by combining the water-expandable rubber elastic index material on both sides with a synthetic rubber plate interposed therebetween. This is because the synthetic rubber plate in between can prevent gaps in the seating grooves due to excessive length expansion when the water-expandable rubber elastic index member is expanded.

Reference numeral 30, which is not described in FIG. 4, is a casing installed to prevent the soil from decaying inside the heart, unlike the prior art, only one casing is sufficient in the present invention.

In the embodiment, the predetermined position of the tubular body 10 to which the water-expandable member 20 is coupled should be a lower end of the boundary layer between the soil layer and the rock layer, as shown in FIG. 4. Thus, the contaminated surface water flowing into the borehole from the boundary layer can be prevented and the groundwater inside the borehole can be prevented from flowing out to the boundary layer between the water expansion members 20.

In order to more completely block the borehole, two or more water expansion members 20 may be installed at different positions of the lower end of the boundary layer.

Furthermore, the tubular body 10 to which the water expandable member 20 is coupled is installed inside the bore hole, and the water expandable member 20 is sufficiently inflated by the groundwater accumulated in the bore hole, so that the borehole and When the pores are blocked, the cement mortar is injected into the pores between the bore holes and the tubular upper portion of the water-expandable member 20, thereby realizing more complete blocking of the bore holes.

At this time, the injection of the cement mortar may be a means for preventing the drying of the water expansion member (20).

Although a preferred embodiment of the present invention has been described in detail above, those of ordinary skill in the art to which the present invention belongs, in various forms within the technical spirit of the present invention described in the appended claims Modifications or changes can be made and the description thereof is omitted.

After drilling the bore hole using the present invention utility model air, the water expansion member is installed in the bore hole, so that the water expansion member is expanded by water or moisture in the bore hole, and the rock layer wall surface of the bore hole and the outer surface of the pipe body. The more tightly fixed, there is an effect that can easily and effectively prevent the leakage of the borehole.

Claims (8)

In the borehole leak prevention device for preventing the groundwater inside the borehole to leak from the upper rock bed, Leak prevention tube installed inside the bore hole; And a water expansion member coupled to a predetermined position of the tubular body to expand only by contact with water or moisture therein to close the gap between the bore holes and the bore hole. The method of claim 1, The predetermined position where the water expansion member is coupled is an outer circumferential surface of the tube, The outer circumferential surface of the tubular body to which the water expansion member is coupled has a seating groove formed in the circumferential direction, Bore hole leakage preventing device using a water expansion member, characterized in that the water expansion member is seated coupled to the seating groove of the tube. The method according to claim 1 or 2, Predetermined position of the tubular body to which the water expansion member is coupled is a borehole leakage preventing device using the water expansion member, characterized in that the lower end of the hard layer of the soil layer and the rock layer. The method of claim 3, wherein The water expansion member is a borehole leakage preventing device using a water expansion member, characterized in that the water-expandable rubber elastic index material. The method of claim 4, wherein The water-expandable rubber elastic index material is a borehole leakage preventing device using a water-expandable member, characterized in that the sodium bentonite raw material and butyl rubber made by synthesizing. The method of claim 5, wherein The water-expandable member is a borehole leakage preventing device using a water-expandable member, characterized in that the tape is wound several times with the water-expandable rubber elastic index material. The method of claim 5, wherein The water expansion member is a borehole leakage preventing device using a water expansion member, characterized in that the ring made by combining the water-expandable rubber elastic index material on both sides with a synthetic rubber plate. The method of claim 7, wherein Bore hole leakage preventing device using a water expansion member, characterized in that the water expansion member is installed at two or more different positions at the lower end of the boundary layer.

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