KR20130113395A - Method for punching digging hole for heat exchanger having a type of soaking in underground water and structure of digging hole the same - Google Patents

Abstract

PURPOSE: An excavation hole boring method for a heat exchanger in a ground water soaking type, and an excavation hole structure thereof are provided to completely prevent the inflow of sewage into an underground aquifer from the ground, by a first casing or grouting from the ground surface to an underground rock layer. CONSTITUTION: An excavation hole boring method for a heat exchanger in a ground water soaking type comprises the following steps: a first step of boring a first excavation hole (21) from the ground surface to the top or the core of an underground rock layer (14); a second step of determining whether or not an aquifer exists during the first excavation hole boring process; a third step of pulling out a core drill of a borer and then inserting a first casing (41) to closely stick to the inner surface and lower end of the first excavation hole, if an aquifer is determined to exit in the second step; a fourth step of boring a second excavation hole (22) to the core of the underground aquifer under the underground rock layer using the core drill of the borer in order to has a smaller diameter than the first excavation hole; and a fifth step of inserting a second casing (42) down into the core of the underground aquifer which closely sticks to the inner surface of the second excavation hole.

Description

Method for punching digging hole for heat exchanger having a type of soaking in underground water and structure of digging hole the same}

The present invention relates to an excavation hole drilling method for a groundwater immersion type heat exchanger and a structure of an excavation hole. More specifically, in order to prevent the excavation hole from being contaminated, grouting or external casing is installed from the ground surface to the upper part or deeper part of the underground rock layer. And it relates to a perforated structure for the groundwater immersion type heat exchanger that can prevent the contamination of the waste water flows from the ground or ground soil layer by inserting the inner casing from the center top of the grouting or outer casing to the deep part of the underground aquifer.

In general, facilities that require cooling and heating, such as buildings or facility houses, perform air conditioning directly or indirectly using a heat pump. The heat pump includes a water heat exchange method and an air heat exchange method according to the heat exchange method of the condenser and the evaporator, but a suitable one is used depending on the intended use.

For example, a water heat exchange type heat pump heats water through a condenser and heats it while the heat medium passes through it to guide the heated heat medium to the circulation pipe to radiate heat from the radiator inside the heating facility. Will heat up.

The heating medium can be heated directly from the condenser of the heat pump to the heating facility, but the heat storage tank can be installed in the middle of the circulation pipe, and the heat storage medium is temporarily stored in the heat storage tank. The heating medium in the tank can be circulated and heated.

As described above, the heat pump includes a compressor, a condenser, an expansion valve, and an evaporator connected through a refrigerant circulation line to form a cycle. When the heat pump operates, the heat pump is compressed into a gas refrigerant of high temperature and high pressure as the compressor operates. The compressed refrigerant is condensed into a condenser and condensed into a liquid refrigerant having a high temperature and high pressure while being heated around the condenser by heat exchange (heat dissipation) while the refrigerant passes through the condenser.

The liquid refrigerant of the condensed high temperature and high pressure is evaporated in the evaporator as it is in a low pressure state in the expansion valve, and as the refrigerant evaporates (evaporates) in the evaporator, the vaporization heat of the refrigerant necessary for evaporation is absorbed from the outside so that the surroundings of the evaporator are cooled. The low temperature and low pressure gas refrigerant passing through the evaporator is compressed by suction by a compressor, thereby allowing continuous heat exchange in the evaporator while repeatedly performing the aforementioned process.

As described above, when the heat pump is operated, since the temperature of the outside air (outside air) that is sucked for heat exchange with the evaporator is high during the day or summer, the heat of vaporization necessary for vaporizing the refrigerant of the evaporator is sufficient. If the outside air temperature (below 5 ℃) is low during winter nights on this coming day, there is a lack of heat of vaporization necessary to vaporize the refrigerant in the evaporator from the outside air sucked for heat exchange with the evaporator. .

As the frost starts to form, the frost is accelerated more rapidly. As the frost forms on the evaporator, the heat exchange efficiency is further lowered because it blocks the air flow of the evaporator and obstructs air flow.

In order to prevent the thermal efficiency of the heat exchange type heat pump from deteriorating, it is one of the reasons to adopt a water heat exchange type heat pump using groundwater having a constant temperature (about 16 ° C. or less) as a heat source.

In the case of such a water heat exchange type heat pump, the drilling hole is drilled into the ground using a drilling machine on the ground surface, and the heat exchanger pipe is installed to enter and exit the bottom of the drilling hole by drilling out to the depth of the water. The end of the heat exchange tube should be connected to the heat exchanger.

As described in Patent Literature 1, the excavation hole is generally drilled from the strata where water is sufficiently discharged, that is, from the earth's surface to the bottom of the soil layer or the porous hard rock layer, and depending on the region, to the underground aquifer layer below the underground rock layer. Excavation may also be drilled. At this time, the grouting facility is provided at the upper end of the excavation hole from the ground surface to a predetermined depth.

KR 101220897 B1

However, in the conventional excavation hole as described above, although a grouting facility is provided to prevent contamination by a predetermined depth from the ground surface, which is the inlet of the excavation hole, the grouting facility places concrete on the ground surface, and the inlet of the excavation hole is provided. Since it is installed only in the upper part of the soil layer from the surface of the phosphorus, sewage can infiltrate through the ground surface and the soil layer around the excavation hole, and thus, the periphery of the excavation hole is naturally contaminated.

The present invention has been researched and developed in order to solve the conventional closed and problems as described above, and drilled the first excavation hole from the ground surface to the upper part or the deep part of the underground rock bed and the aquifer layer during the drilling process of the primary excavation hole With or without grout, grouting or inserting the first casing, and then inserting the second casing while drilling to the center of the subsurface aquifer below the underground rock bed, the sewage from the ground surface to the underground aquifer The purpose of the present invention is to provide a drilling method for drilling a groundwater immersion type heat exchanger and an excavation structure thereof so as to reliably block the inflow to the groundwater, thereby preventing the contamination of the underground aquifer.

Excavation hole drilling method for groundwater immersion type heat exchanger of the present invention for achieving the object as described above is the first step of drilling the primary excavation hole from the ground surface to the top or deep part of the underground rock layer using a core drill In the second step of judging whether there is an aquifer in the drilling process of the first drilling hole, if there is an aquifer in the second step, the core casing of the drilling machine is removed and the first casing is brought into close contact with the inner surface and the bottom of the first drilling hole. A third step of inserting the fourth step, and then drilling the second excavation hole to the deep aquifer below the underground rock bed using a core drill of a perforator to have a diameter smaller than that of the first excavation hole, the second excavation And a fifth step of inserting the second casing, which is in close contact with the inner surface of the ball, to the deep underground aquifer.

In the third step, if there is no aquifer in the second step, the core drill of the drilling machine is removed, and the grout is filled and cured throughout the first drilling hole.

In the fifth step, a plurality of distribution holes are drilled in the second casing located at the deep part of the underground aquifer in the lower part of the underground rock bed so that the groundwater around the outside of the second casing as well as the lower end of the second casing can be easily entered. .

In the excavation hole structure for the groundwater immersion type heat exchanger according to the present invention, the first excavation hole is drilled from the ground surface to the upper part or the deep part of the underground rock layer, and from the upper center of the first excavation hole to the deep underground aquifer layer in the lower part of the underground rock layer. A secondary drilling hole having a diameter smaller than the primary drilling hole is drilled, and the second casing is inserted into the secondary drilling hole from the ground surface to the deep aquifer layer.

The first drilling hole is characterized in that the first casing is inserted from the ground surface so that the inner surface and the lower end of the primary drilling hole is in close contact.

In addition, the lower ring of the first casing is characterized in that the O-ring packing is provided for maintaining the airtight with the underground rock.

The first excavation hole is characterized in that the grout is provided by filling the grout agent only on the outer side of the second casing.

In addition, the upper protective facility is provided in a shape that protrudes upward from the ground surface to cover the primary drilling hole so as to prevent the inflow of pollutants into the interior of the primary and secondary drilling holes.

Excavation hole drilling method for groundwater immersion type heat exchanger according to the present invention and the excavation structure of the excavation hole drills the first excavation hole from the ground surface to the upper part or deeper part of the underground rock bed and there is no aquifer layer during the drilling process of the first excavation hole Grouting with a grout or inserting the first casing, and then inserting the second casing while drilling the ground surface to the depth of the subsurface aquifer below the subsurface bedrock to the top or deep of the underground bedrock. By casing or grouting, it is possible to reliably block the inflow of sewage from the ground surface to the underground aquifer, thereby reliably preventing the contamination of the underground aquifer.

1 is a schematic diagram of a cooling and heating apparatus using a water heat exchange type heat pump to which an excavation hole structure for groundwater immersion type heat exchanger according to an embodiment of the present invention is applied.
Figure 2 is a view showing the excavation hole structure for groundwater immersion type heat exchanger of one embodiment according to the present invention.
3 is a view showing the structure of the excavation hole for groundwater immersion type heat exchanger of another embodiment according to the present invention.
4 is a view schematically showing a process of drilling into the excavation hole structure of FIG. 2 according to the present invention.
5 is a view schematically showing a process of drilling into the excavation hole structure of FIG. 3 according to the present invention.

Hereinafter, the drilling hole drilling method for groundwater immersion type heat exchanger according to the present invention and the drilling hole structure thereof will be described in detail with reference to the accompanying drawings. For reference, the size of the components shown in the drawings referred to in describing the present invention, the thickness of the line, etc. may be somewhat exaggerated for ease of understanding, terms used in the description of the present invention considering the functions in the present invention The definition of the term may vary depending on the user, operator's intention, convention, and the like. The definition of the term should be based on the contents throughout the specification.

1 is a view showing a cooling and heating device using a water heat exchange type heat pump to which the excavation hole structure for groundwater immersion type heat exchanger according to the present invention is applied.

As shown in the figure, an excavation hole 20 is drilled from the ground surface 11 to the deep part of the underground aquifer layer 15, and the excavation hole 20 has an underground aquifer layer below it from the inlet of the ground surface 11. 15) Several heat exchange tubes 30 are constructed to enter and exit the core, and both ends thereof are connected to the first and second heat medium headers 31 and 32, and the first and second heat medium headers 31 are formed. , 32 is connected via the heat medium line 34 to heat exchange while passing through the evaporator of the heat pump 33 provided in the vicinity of the excavation hole (20).

The heat pump 33 is connected to form a cycle through the refrigerant circulation line so that the refrigerant compressed by the compressor is circulated along the condenser, expansion valve and evaporator, and is provided with a four-way valve for switching the flow of the refrigerant It may be.

The first and second heat medium headers 31 and 32 may be disposed to prevent contaminants from flowing into the primary and secondary casings 41 and 42 constituting the excavation hole 20 when it rains or when a flood occurs. It may be provided with an upper protective facility to cover the excavation hole 20, including. The upper protective device should be provided to protrude upward from the earth's surface.

Figure 2 is a view showing the excavation hole structure for groundwater immersion type heat exchanger of one embodiment that is the main part of the present invention in FIG. Here, the excavation hole 20 is drilled from the ground surface 11 through the soil layer 12 and the hard rock layer 13 to the upper part or the deep part of the underground rock layer 14, and the first excavation hole 21 is drilled. The primary excavation hole 21 is provided with a first casing 41 is inserted from the ground surface so that the inner surface and the bottom of the primary excavation hole 21 is in close contact, and the secondary excavation having a diameter smaller than the primary excavation hole 21 A hole 22 penetrates through the underground rock layer 14 to the deep underground aquifer 15 at the lower part thereof, and the second excavation hole 22 extends from the ground surface to the deep part of the underground aquifer 15. The second casing 42 is inserted.

At the lower end of the first casing 41, the sewage that penetrates the soil layer 12 and the hard rock layer 13 from the ground surface 11, which is the periphery of the primary drilling hole 21, is the primary drilling hole 21 of the underground rock layer 14. O-ring packing 43 may be provided to keep the airtight so as not to flow into.

In addition, the second casing 42 has a plurality of distribution holes 44 perforated in a portion located in the deep portion of the underground aquifer layer 15 in the lower part of the underground rock layer 14, the distribution holes 44 are This is to allow the ground water around the outside of the second casing 42 as well as the lower end of the second casing 42 to be easily taken in and out.

The ground surface 11 is basically provided with a concrete layer of a predetermined thickness so that rain or sewage does not flow, and the upper end of the first and second casing (41, 42) is the rain or other dirt of the surface (11) It is preferable to protrude a predetermined height above the ground surface 11 so as to prevent the inflow.

3 is a view showing another embodiment of an excavation hole structure for an underground water immersion type heat exchanger, which is a main part of the present invention. Here, the primary excavation hole 21 is drilled from the ground surface 11 through the soil layer 12 and the hard rock layer 13 to the upper portion or the core portion of the underground rock layer 14, and the primary excavation hole 21 The grout 23 is filled with a grout agent and cured for a predetermined time. The second grout 23 has a diameter smaller than that of the primary digging hole 21 from the upper center of the grout 23 to the core portion of the underground aquifer layer 15. Excavation hole 22 is the same as the excavation hole structure of one embodiment except that it is perforated.

One embodiment of the present invention as described above will be described in detail the method of drilling in the excavation hole structure for the groundwater immersion type heat exchanger of Figure 2 (see Figure 4).

<First Step>

First, the primary drilling hole 21 is drilled from the ground surface 11 to the upper portion or the deep portion of the underground rock layer 14 using the core drill of the drilling machine.

<Step 2>

In the first step, it is determined that there is an aquifer in the process of drilling the primary drilling hole 21. At this time, the process of determining the presence of the aquifer is ground water flows out to the upper part of the core drill or the first excavation when drilling from the ground surface to the bottom of the soil layer 12 or the hard rock layer 13 using the core drill of the drilling machine. If the groundwater is filled to a certain depth inside the ball 21, it is determined that there is an aquifer, and if it does not flow out or is not filled to a certain depth, it is determined that there is no aquifer.

<Step 3>

If there is an aquifer in the second step, the core drill of the drilling machine is removed and the first casing 41 is inserted to be in close contact with the inner surface and the lower end of the primary drilling hole 21.

<Step 4>

After inserting the first casing 41 into the primary drilling hole 21 through the third step, replace the core drill having a diameter smaller than the primary drilling hole 21 and using the core drill of the drilling machine underground The second drilling hole 22 is drilled down to the core aquifer 15 under the rock layer 14. After drilling the secondary drilling hole 22 as above, remove the core drill of the punching machine.

<Step 5>

Inserting the second casing 42 in close contact with the inner surface of the secondary drilling hole 22 drilled through the fourth step from the ground surface to the deep part of the underground aquifer layer 15. At this time, the second casing 42 is preferably a plurality of holes 44 is drilled in a portion located in the deep portion of the underground aquifer layer 15 in the lower portion of the underground rock layer 14. The reason for this is to allow the ground water around the outside of the second casing 42 as well as the lower end of the second casing 42 to be easily taken in and out.

FIG. 5 is a view illustrating a method of drilling into an excavation hole structure for groundwater immersion type heat exchanger of FIG. 3.

First, the <first step> and the <second step> is a step and work process of determining that there is no aquifer layer and the second step of drilling the first drilling hole 21, the first step in Figure 4 above Since this is the same, a detailed description thereof will be omitted.

<Step 3>

If it is determined that there is no aquifer in the process of drilling the first drilling hole 21 in the first and second steps, the core drill of the drilling machine is removed, and then the grout is filled in the entire first drilling hole 21. Curing for time provides the grout 23.

<Step 4>

When the curing of the grout 23 is completed in the third step, the second excavation hole has a diameter smaller than the primary excavation hole 21 from the upper center to the deep aquifer layer 15 below the underground rock layer 14. Perforate 22). After drilling the second excavation hole 22, the core drill of the punching machine is removed and removed.

Since the fifth step proceeds after inserting the second casing 42 into the secondary drilling hole 22 and the insertion depth is the same as described in the fifth step of drilling the drilling hole structure of FIG. Description is omitted.

The present invention perforates excavation holes for groundwater immersion type heat exchangers that use groundwater as heat sources such as air conditioners, heat pumps, dehumidifiers and heat exchangers, and can be usefully used in fields such as pollution prevention facilities of the excavation holes. .

11: surface 12: soil layer
13: hard rock formation 14: underground rock formation
15: underground aquifer 20: excavator
21: 1st Excavator 22: 2nd Excavator
23: grout 30: heat exchanger tube
31: First thermal medium header 32: Second thermal medium header
33: heat pump 34: heat medium line
41: first casing 42: second casing
43: O-ring packing 44: distributor

Claims (9)

A first step of drilling the first drilling hole from the ground surface to the upper part or the deep part of the underground rock layer by using the core drill of the drilling machine,
A second step of determining whether or not there is an aquifer during the drilling of the first drilling hole;
A third step of inserting the first casing to be in close contact with the inner surface and the bottom of the first drilling hole after removing the core drill of the drilling machine if there is an aquifer in the second step,
A fourth step of drilling the second excavation hole to the deep aquifer below the underground rock bed using the core drill of the drill to have a diameter smaller than the first excavation hole.
And a fifth step of inserting the second casing, which is in close contact with the inner surface of the second drilling hole, up to the deep portion of the underground aquifer layer. The method according to claim 1,
Drilling hole drilling method for groundwater immersion type heat exchanger, characterized in that the O-ring packing is provided and inserted in the lower end of the first casing in the third step. A first step of drilling the first drilling hole from the ground surface to the upper part or the deep part of the underground rock layer by using the core drill of the drilling machine,
A second step of determining whether or not there is an aquifer during the drilling of the first drilling hole;
In the second step, if there is no aquifer layer, a third step of removing the core drill of the perforator and filling and grouting the grout throughout the first drilling hole to prepare the grout;
After the fourth step of drilling the second drilling hole using a core drill of the drill machine with a diameter smaller than the first drilling hole from the upper center of the grout to the deep aquifer below the underground rock formation,
And a fifth step of inserting the second casing, which is in close contact with the inner surface of the second drilling hole, up to the deep portion of the underground aquifer layer. The method according to claim 1 or 3,
In the fifth step, a plurality of distribution holes are drilled in the second casing located at the deep portion of the underground aquifer in the upper portion or the deep portion of the underground rock bed so that the groundwater around the outside of the second casing as well as the lower portion of the second casing can be easily entered. Drilling hole drilling method for groundwater immersion type heat exchanger, characterized in that the. The primary drilling hole is drilled from the ground surface to the upper part or deeper part of the underground rock bed, and the secondary drilling hole having a diameter smaller than the primary drilling hole is drilled from the center of the upper part of the primary drilling hole to the core part of the underground aquifer layer below the underground rock bed layer. And a second casing is inserted into the secondary drilling hole from the ground surface to the deep part of the underground aquifer layer. The method according to claim 5,
The first excavation hole is a digging hole structure for groundwater immersion type heat exchanger, characterized in that the first casing is inserted from the ground surface so that the inner surface and the bottom of the primary excavation hole is in close contact. The method of claim 6,
Excavation hole structure for groundwater immersion type heat exchanger, characterized in that the lower ring of the first casing is provided with an O-ring packing for airtightness with the underground rock bed. The method according to claim 5,
The first excavation hole in the excavation hole structure for groundwater immersion type heat exchanger, characterized in that the grout is provided by filling the grout agent only on the outside of the second casing. The method according to claim 5,
For groundwater immersion type heat exchanger, characterized in that the upper protection facility is provided to protrude from the surface to cover the primary drilling hole to prevent the inflow of contaminants into the primary and secondary drilling holes. Excavator structure.

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