JP2008069576A - Underground water heat exchange system, construction method of underground water heat exchange system and underground water heat exchange method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new technology capable of further efficiently using ground heat of underground water, by eliminating a defect by a conventional vertical well and a horizontal well requiring a wide site. <P>SOLUTION: This underground water heat exchange system 1 is formed so that a single cylindrical casing 2 forming a water communication area part 21 on the lower end side, is vertically driven up to an underground water bearing layer WB; a partition wall body 31 is arranged for separating the cylinder inside of the water communication area part 21 into a pipe inside upper space 22 and an pipe inside lower end part space; an injection pipe 3 opening in the pipe inside lower end part space 23 is introduced from an aboveground side opening; a pumping pipe 4 incorporated with a submerged pump 41 capable of pumping up the underground water W of the pipe inside upper space 22, is introduced from the aboveground side opening; and mutual respective aboveground side end parts of these pumping pipe 4 and injection pipe 3 are connected in an insulating shape from an external part by a connecting pipe 51 incorporated with a heat exchanger 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention has all fields related to the use of groundwater as its technical field, and in particular, a field for installing a heat exchange system for groundwater that uses only the geothermal heat of pumped groundwater and then returns it to the groundwater system. Of course, from the field of providing and selling equipment and equipment necessary for its manufacture and installation, materials necessary for those materials, machinery and parts, such as wood, stone, various fibers, plastics , The field of providing various metal materials, the field of electronic components incorporated in them, the field of control-related equipment that integrates them, the field of various measuring instruments, the field of power equipment that moves the equipment and instruments, In general, we are testing and researching fields generally called industrial machinery such as the fields of electricity and oil, which are energy sources, as well as equipment and instruments. Fields related to display, sales, import and export, generals, results of their use, facilities for making them, fields related to the collection and transportation of garbage generated by the operation of equipment, such garbage There is no technical field that is not related to the new field that cannot be envisaged at present, such as the recycling field where waste is efficiently reused.

(Points of interest)
Sprinkling snow removal by pumping up groundwater does not require transporting snow and has the excellent feature of automatically melting snow day and night without the need for manpower, but the potential for subsidence of the surrounding ground due to a decrease in groundwater However, in recent years it has been almost no longer adopted, but the groundwater heat utilization route has not been completely closed, and the groundwater once pumped up has been used effectively for snow extinguishment. Later, technology to circulate as it was to the original groundwater system was developed and has come into wide use.

(Conventional technology)
Such a circulation-type geothermal utilization system reaches the groundwater system as proposed in, for example, Japanese Patent Laid-Open No. 6-228928, “Circulating underground device using cooling reductant as resuscitation and snowmelt geothermal liquid” invention. A geothermal liquid collection strainer that serves as a suction port is provided on the outer peripheral wall near the lower end, and is disposed substantially concentrically in a geothermal collection casing that is provided with a snowmelt cooling and reducing liquid reduction strainer that serves as a discharge outlet on the outer peripheral wall near the upper end. In the heat insulation casing extended to near the lower end of the geothermal heat collection casing, a pump for pumping up groundwater connected to the suction end of the snowmelt geothermal liquid circulation pipe is built in, and the snowmelt geothermal liquid circulation near the upper end of the geothermal heat collection casing Connect the discharge end of the pipe, and between the geothermal liquid collection strainer and the snowmelt cooling reduction liquid reduction strainer, the reducing liquid and geothermal heat in the geothermal collection casing A separation packer is provided that separates the groundwater from the groundwater, using only the geothermal heat accumulated in the pumped-up groundwater, and then circulating all the groundwater pumped up to the original groundwater system. No. 265411 discloses a “non-sprinkling snow-dissipating facility using a thin aquifer” as in the invention, placing a pumping well and an injection well so as to form a horizontal well along the thin aquifer, The discharge of the pumping well is connected to the suction pipe with the submersible pump, and the discharge of the pumping well is connected to the inlet of the radiating pipe embedded in the pavement. The outlet is connected to the injection pipe connected to the injection well, and the groundwater pumped from the pumping well flows and passes through the heat radiating pipe without touching the atmosphere. Through the well Such as those which enables reduction is found here and there in the underground water system.

However, the former "circulating underground device that uses cooling reductant as resuscitation and snowmelt geothermal liquid" invention is located between the discharge end of the snowmelt geothermal liquid circulation pipe arranged in the geothermal collection casing and the pump for pumping up groundwater. A heat insulating casing is provided as a partition, but the reducing liquid discharged from the snow melting geothermal liquid circulation pipe is sucked up by the pump again as geothermal liquid before it is fully absorbed and heated, and the snow melting geothermal liquid If the reducing solution discharged into the groundwater system through the snowmelt cooling and reducing solution reducing strainer flows into the warm groundwater, convection is generated due to the temperature difference and From the geothermal liquid collection strainer of the heat sink, which flows from the bottom opening of the heat insulating casing where the suction port of the pump becomes a trap, and sucks groundwater that is lower than the surrounding groundwater temperature. In the latter case, the invention of the latter “non-sprinkling snowfall facility using a thin aquifer” has two aquifers: a pumping well and an injection well. Along with this, there is a drawback that the site required for the construction will be widened, the size of the snow-melting facility will become larger, and eventually the construction cost will rise. If it was adopted in an area limited to a thin aquifer, it would be necessary to adopt and construct a vertical well for an aquifer with sufficient thickness.
(1) JP-A-6-228928 (2) JP-A-2000-265411

(Awareness of problems)
As mentioned above, the previously proposed “circulating underground device that uses cooling reductant as resuscitation / snow melting geothermal fluid” has the suction port of the pump in the geothermal collecting casing placed vertically, and the snow melting geothermal fluid circulation Since it is set to pump the groundwater below the discharge end of the pipe, the reduced water that has just been reduced into the underground aquifer after heat exchange has been pumped up again as geothermal liquid, and in the same groundwater system The geothermal liquid with a lower calorific value than the surrounding groundwater is circulated, which has the disadvantage that an effective snow-dissipating effect cannot be obtained. The “snow facility” is a horizontal well that requires a larger site than the vertical well for both the pumping well and the injection well, and can be constructed in places where it is difficult to secure sufficient land. More than anything For aquifer having a thickness has the disadvantage of being unsuitable, development of more efficient groundwater heat exchange system is desired.

(Object of invention)
Therefore, the present invention eliminates the disadvantages of conventional vertical wells in which groundwater that has been reduced to the groundwater system after using geothermal heat is pumped up again, and has the disadvantages of horizontal wells that require a considerably larger site. From the judgment of whether it is possible to achieve a new technology that makes it possible to use geothermal heat of groundwater more efficiently, we started its development and research quickly, trial and error over a long period of time, and many trials and experiments As a result, we have finally succeeded in realizing a groundwater heat exchange system with a new structure, a construction method for the new groundwater heat exchange system, and a new groundwater heat exchange method using them. In the following, the configuration will be described in detail together with an embodiment representative of the present invention shown in the drawings.

(Structure of the invention)
As will be clearly understood from the embodiments representing the present invention shown in the drawings, the groundwater heat exchange system of the present invention basically comprises the following configuration.
That is, a single cylinder type casing formed with a water-passing area part capable of passing water in the circumferential wall thickness direction over a predetermined range at the lower end is substantially vertical to the depth at which the water-passing area part faces the underground aquifer. On the other hand, a partition wall that can separate the upper space in the pipe and the lower end space in the pipe in a sealed manner is disposed at an appropriate position in the vertical direction of the water flow area in the single cylinder casing. An injection pipe having a partition wall extending vertically and opening in the lower end space in the pipe is introduced from the ground opening of the single-cylinder casing, and the upper space in the pipe from the ground opening of the single-cylinder casing. Introduce a pumping pipe incorporating a submersible pump to an appropriate depth where the groundwater flowing in through the water flow area can be pumped, and between the ends of the ground pipe of the pumping pipe and the injection pipe, Built-in linking pie In a ground water heat exchange system for a configuration in which as formed by connecting externally to the isolated form the subject matter.

The groundwater heat exchange system consisting of this basic configuration can be expressed in different ways:
A single-cylinder casing formed with a water-permeable region that allows water to flow in the thickness direction of the peripheral wall with a lower end of a predetermined range is punched in a substantially vertical shape to the depth where the water-permeable region reaches the underground aquifer. On the other hand, a partition body that allows the upper space in the tube and the lower space in the tube to be separated in a sealed manner is disposed at a midway in the vertical direction of the water flow area in the single-tube casing. An injection pipe, which is formed as a through-hole in the upper and lower sides of the pipe, is introduced from the ground opening of the single-cylinder casing through the ground side opening of the single-cylinder casing and is passed through the upper part of the pipe from the ground side opening of the single-cylinder casing. A pumping pipe incorporating a submersible pump is introduced to an appropriate depth where the groundwater flowing through the water area can be pumped, and a heat exchanger is installed between each end of the ground pipe of the pumping pipe and the injection pipe. Outside with connected pipe The groundwater near the upper middle of the underground aquifer corresponding to the upper space in the pipe pumped up by the submersible pump is supplied to the heat exchanger via the pumping pipe, and the groundwater after the heat exchange is completed. The groundwater heat exchange system is configured to be configured to be reduced to the vicinity of the middle and lower layer of the underground aquifer corresponding to the lower end space in the pipe through the injection pipe.

    As a more specific example, a single-cylinder casing formed with a water-passing area part that allows water to flow in the thickness direction of the peripheral wall over a predetermined range at the lower end, the water-passing area part is underground aquifer. In the single cylinder type casing, the upper space in the pipe and the lower end space in the pipe can be separated in a sealed manner at an appropriate position in the vertical direction of the water flow area in the single cylinder casing. The partition wall is arranged in parallel with the partition wall at a suitable position in the upper space in the pipe so that the plane center of the partition wall is vertically penetrated. An injection pipe that opens to the lower end space in the pipe is introduced from the ground opening of the single-cylinder casing, and flows into the upper space in the pipe from the ground opening of the single-cylinder casing through the water flow area. To the appropriate depth where the groundwater can be pumped Introducing pumping pipes incorporating submersible pumps, and connecting the ends of ground pumps of these pumping pipes and injection pipes to each other from the outside with connecting pipes incorporating heat exchangers The groundwater heat exchange system consisting of

(Related invention 1)
In connection with the above-described groundwater heat exchange system, the present invention also includes a groundwater heat exchange system construction method related to the installation.
That is, a water passage region portion that allows water to flow in the thickness direction of the peripheral wall over a predetermined range at the lower end is formed. A fixing washer having a cylindrical mounting seating surface is fixed in a hermetically sealed manner, and a single-cylinder casing having an annular impermeable band attached to an appropriate position on the outer peripheral wall surface above the water flow area portion, A single-cylinder casing placement process in which the entire water flow area is placed in a substantially vertical shape up to the optimum depth reaching the underground aquifer, and a frustum-shaped joint ring that is inverted up and down The upper part of the single-cylinder casing is inserted through the injection pipe that integrates the flat center of the top and bottom in a vertically penetrating manner, and if necessary, its midpoint is in close contact with the appropriate position on the inner peripheral wall of the single-cylinder casing. Through one or more support frames that allow water to pass vertically. A single-cylinder casing is formed by fitting and closely contacting the joint seat surface of the joint ring from above to the mounting seat surface of the fixing washer provided in advance at a predetermined depth position of the water flow area portion. After the inside of the pipe is separated into the upper space in the pipe and the lower end space in the pipe, and at the same time, the partition body forming process is performed so that the discharge end of the injection pipe is opened to the lower end space in the pipe, the upper end of the single-cylinder casing is known. The submersible pump at the lower end of the introduced pumping pipe is placed in a suitable place where it is submerged in the underground aquifer in the upper space of the pipe. And connecting pipes incorporating heat exchangers between the ends of the ground pipes of the injection pipes, connecting the pipes from the pumping pipes to the injection pipes in an isolated manner from the outside. Up to A method of constructing basic groundwater heat exchange system forming the present invention.

(Related invention 2)
Furthermore, in addition to the construction method of the above groundwater heat exchange system, the present invention also includes a groundwater heat exchange method thereby, and the water flow area was placed in a substantially vertical shape so as to reach the underground aquifer. In the single-cylinder casing, the groundwater above the subsurface aquifer where the upper space in the pipe separated by the partition wall is exposed in the water flow area, by the submersible pump of the pumping pipe arranged in the upper space in the pipe The pumping process of pumping up the aquifer water that was pumped up was conducted, and the groundwater pumped up through the pumping pipe was supplied to the heat exchanger through the connecting pipe, and the heat exchange process was performed to release the geothermal heat. The groundwater after the heat exchange is forcibly guided to the lower end space in the single-cylinder casing through the injection pipe via the connecting pipe, and the subsurface aquifer is lower than the previous pumped bed. Groundwater by the groundwater heat exchange system according to the present invention, which is configured to continuously or intermittently repeat a series of steps of performing a reduction process to the aquifer lower layer water that is poured and reduced into the groundwater. That is the heat exchange method.

    As described above, according to the groundwater heat exchange system of the present invention, the groundwater that has flowed into the upper space in the pipe above the partition wall of the single-cylinder casing is pumped through the submersible pump and the pumping pipe, and is simply passed through the connecting pipe. After supplying the heat exchanger installed outside the cylindrical casing and using geothermal heat, the groundwater radiated using geothermal heat is isolated from the connection pipe to the injection pipe. The water is forcibly sent to the lower end of the single-cylinder casing and is forced to the lower layer than the pumped area in the underground aquifer outside the single-cylinder casing through the water flow area. In that case, the heat-dissipating groundwater that has been reduced into the underground aquifer has been absorbed by heat and is considerably cooler than the original groundwater. Therefore, due to the temperature difference, it remains in the lower layer in the subsurface aquifer, and it is difficult to mix in the original subsurface aquifer where the temperature is higher in the upper layer, and at the same time the single cylinder type Since the upper space of the casing in the pipe rises to the wall, it has a structure that cuts off by the bulkhead, so that the phenomenon that reduced and returned radiated groundwater flows in by the submersible pump can be reliably suppressed. However, it has the excellent feature that it can overcome the disadvantage of lowering the groundwater temperature, and can realize the use of geothermal heat much more efficiently.

    In addition, vertical single-cylinder casings can be placed on limited and relatively small sites, making the ground facility substantially smaller than horizontal cylindrical casings that require large sites. In addition, since the installation work is much easier compared to the horizontal cylindrical casing, the manufacturing and installation can be suppressed to a relatively low price range, and it is based on the single cylindrical casing. In addition, since each component part has a rational arrangement structure, the maintenance is easy, and the advantage that significant cost savings can be realized as a whole is obtained.

    In addition, the midway appropriate point above the partition wall of the injection pipe introduced into the single-cylinder casing is concentric via one or a plurality of support frames that are connected to the inner wall of the upper space in the pipe. In the case where it is supported in a shape, the outlet of the injection pipe is arranged vertically downward in the center of the single cylinder casing, and is substantially homogeneous and dispersed in the underground aquifer through the single cylinder casing water passage area. It can be reduced and released in the form of a single cylinder, and the outer part of the single-cylinder casing will be uniformly diffused to prevent it from being reduced in a lump, and after the reduction and return It is possible to avoid the adverse phenomenon that would be mixed in the original underground aquifer in the relatively early stage of the water, and to effectively eliminate the decrease or unevenness of the original groundwater temperature It will be.

    The partition body is formed of an annular body fixed to a suitable position on the inner peripheral wall of the single-cylinder casing, and a fixing washer having a vertical funnel-shaped mounting seat surface is provided at the center thereof, and the mounting seat surface of the fixing washer On the other hand, it has a truncated cone shape with its tip cut off and turned upside down, and the lower end of the injection pipe is connected to the center of the upper end, and the discharge port of the injection pipe is opened in a penetrating manner at the center of the lower end. The joint seat surface formed on the outer peripheral cone-shaped surface of the joint ring is sealed downward from above, and is combined in a fitting shape. After placing the single cylinder casing into the ground, The discharge port of the injection pipe inserted from the upper end opening can be naturally fixed in a vertically downward posture at the center of the single-cylinder casing at the desired depth in the deep part, and closed in a sealed state by remote operation. That can be It is possible to obtain a large effect of improving the workability.

    Further, the injection pipe is disposed in the upper space in the pipe, and is bent so that a midway portion directly above the support frame is brought close to the inner peripheral wall of the single-tube casing, and the inner peripheral wall of the single-tube casing Can extend the accommodation space of the submersible pump disposed above the support frame, and as a result, the single cylinder casing can be reduced in diameter and bored. This will reduce the burden of construction and realize more economical construction.

    The single cylinder type casing is fitted with an annular impermeable band that allows the gap between the inner wall of the excavation hole to be closed in a sealed manner on the outer peripheral wall near the boundary between the upper formation at the placement site and the underground aquifer below it. In this case, the gap between the outer peripheral wall surface of the single-cylinder casing and the inner peripheral wall of the excavation hole is closed and hermetically closed. In addition to preventing leakage of underground aquifer water, it is possible to realize an almost perfect pumping and injection reduction system, as well as a heat exchanger for road heating laid under the paved surface. In the case of the heat pipe set in the groundwater system, the groundwater heat stored in the pumped water drawn from the underground aquifer can be efficiently used for road heating without reducing the amount of water in the groundwater system. Only taking groundwater heat And is assumed to be utilized in, it comes to have Xiu features that can help such gentle effective snow melting and prevent freezing in the environment.

    On the other hand, according to the groundwater heat exchange system construction method of the present invention, the single-cylinder casing is provided with an annular body on the inner peripheral wall at a depth corresponding to the appropriate position in the underground aquifer of the single-cylinder casing, A fixing washer having a vertical funnel-shaped mounting seating surface is fixed in a sealed manner in the center, and if necessary, an annular impermeable band is attached to the outer peripheral wall surface of the single-cylinder casing. It is designed to be driven almost vertically so that it reaches the aquifer at a predetermined depth in the basement, and only the single-cylinder casing is placed first, and then the piping of the injection pipe and pumping pipe Proceed with work so that the drilling of vertical holes using construction machines such as boring machines and earth augers and the driving work of single-cylinder casings can be performed efficiently by the conventional pre-boring method. In addition, it is possible to perform the piping and positioning work of the injection pipe easily and reliably. After that, the pumping pipe is introduced and installed so that the positioning operation of the injection pipe and the pumping pipe can be performed appropriately and appropriately. As a result, it is possible to reliably perform the work and improve the accuracy and workability during construction.

    In addition, a heat exchanger is connected via connecting pipes between the ends of the pumped pipe and injection pipe that are led to the ground by the heat exchanger connection process, and only the geothermal heat accumulated in the pumped groundwater is obtained. A single-cylinder casing water flow area in the same location as the pumping location, where the amount of groundwater is the same as when pumped after being effectively used as a heat medium for taking out, snow-melting or as a heat energy source for hot water supply or power generation The groundwater subsidence due to the reduction of groundwater is reliably prevented by reducing and returning to the groundwater aquifer at the predetermined position where the section faces, and it has the great feature that it can be used for various purposes as an environmentally friendly heat source. Will be.

    Furthermore, according to the groundwater heat exchanging method using the groundwater heat exchanging system of the present invention, it is possible to preferentially and surely pump up the original warm groundwater in the upper layer part of the subsurface aquifer. Compared to the same amount of groundwater pumped up by the mold well, more heat energy can be obtained, and after the heat exchange is finished, it is forcibly returned to the lower end space in the single-cylinder casing pipe through the injection pipe. The heat-dissipated groundwater is absorbed by heat exchangers, etc. or has been radiated naturally through each pipe and is considerably cooler than the surrounding groundwater, and its specific gravity is greater than the original warm groundwater, The phenomenon of mixed flow into the upper layer in the underground aquifer where the pumped water is trapped is avoided as much as possible, and also in the single cylinder casing pipe In addition to its existence, the difference in specific gravity also prevented the upper space in the pipe with the submersible pump from rising and mixing into the trap, making it possible for the original geothermal heat to be exchanged more efficiently. It will be effective.

In implementing the present invention having the configuration as described above, the best or desirable mode will be described.
The single-cylinder casing reaches the underground aquifer and maintains the underground arrangement and shape of the upper space in the pipe and the lower space in the pipe located below it, and prevents the intrusion of earth and sand. It is to be attached to a partition wall, etc., and functions to form a substantial body of the well portion of the groundwater heat exchange system, and is driven into a previously drilled vertical hole or simultaneously with drilling Any one of them, such as those that are driven into the ground, or a single unit when there is an aquifer in a relatively shallow stratum that is driven by adding a plurality of divided cylinders It can be driven without adding a cylinder, etc., with a plurality of relatively small holes or slits on the peripheral wall where the lower end facing the underground aquifer spans a predetermined range Or any of various forms such as those with mesh-like mesh holes, or those fitted with a metal mesh, a coiled wire, or a wire tightly attached to the outer periphery of the wall opening In addition, a fixed washer that forms a part of the bulkhead should be provided on the inner wall of the appropriate place located in the underground aquifer. In addition, it is assumed that the outer wall surface near the boundary between the upper stratum and the underground aquifer below it is fitted with an annular impermeable band that can close the gap with the inner wall of the excavation hole in a sealed manner. More specifically, carbon steel pipes for piping, or black pipes thereof, metal pipes such as galvanized steel pipes or stainless steel pipes, synthetic resin pipes such as vinyl chloride pipes, concrete having reinforcing bars Pipe making It can be those formed from.

    The water flow area allows water to pass through the peripheral wall part of the single-cylinder casing that reaches the aquifer in the ground, as well as the operation of the submersible pump, water transfer to the pumping pipe, heat exchanger, injection pipe, etc. A single cylinder type that spans the upper space in the pipe and the lower end space in the pipe separated by the bulkhead, which functions to prevent foreign matter such as earth and sand from being sucked up and mixed into the groundwater so that heat transfer etc. is maintained normally It must be formed over the casing peripheral wall range, in other words, a single cylinder corresponding to the upper space in the pipe and the lower end space in the pipe, excluding the single cylindrical casing peripheral wall portion corresponding to the partition wall built-in portion It can be said that each of the peripheral walls of the mold casing must be formed so as to ensure a desired flow rate, and as described above, the circumference of the portion facing the underground aquifer of the single cylinder casing In addition, a metal net, a coiled wire, or a wire other than the one provided with a plurality of relatively small holes or slits, a mesh-shaped mesh hole, or a wall surface opening is attached. It is possible to have various forms such as those equipped with filters.

    The ring-shaped impermeable zone is filled between the inner peripheral wall of the borehole and the outer peripheral wall surface at an appropriate depth position of the single-cylinder casing, and serves to prevent the groundwater from flowing out to the ground. Specifically, it is a water-impervious packer having waterproofness and elasticity such as a band shape, a ring shape, and a string shape wound around the outer peripheral wall surface of a single-cylinder casing, and more specifically, a water-absorbing polymer and SBR. (Styrene / butadiene rubber) made of an absorption-expandable material made of synthetic rubber, and as shown in the examples described later, for example, “Nice Seal” (trade name) manufactured by OKS Applied Measurement Service Co., Ltd. may be used. it can.

    The bulkhead body divides the inside of the single-cylinder casing into a pipe upper space that accommodates the submersible pump of the pumped pipe and a pipe lower end space that opens the discharge end of the injection pipe. It must be able to prevent the heat exchanged groundwater that has been exchanged through the pipe from being sucked up again, and to ensure sealing between the upper space in the pipe and the lower space in the pipe, The discharge end of the injection pipe must be placed in a suitable location near the center of the single-cylinder casing and facing the lower end space in the pipe. More specifically, as shown in the examples to be described later, it is composed of an annular body fixed to a suitable place on the inner peripheral wall of the single-cylinder casing, and a vertical funnel-shaped mounting seat surface is formed at the center thereof. Washer It has a frustum shape that is inverted upside down with respect to the mounting seat surface of the fixing washer, and the lower end of the injection pipe is connected to the center of the upper end, and the discharge port of the injection pipe is passed through the center of the lower end. The joint seat surface formed on the outer peripheral cone-shaped surface of the joint ring that is opened may be combined so as to be sealed and fitted in a fitting manner downward from above.

    The washer for fixing is a suitable place on the inner peripheral wall placed in the underground aquifer of the single-cylinder casing, and a joint ring that integrates the discharge end of the injection pipe is sealed and fitted at the place where the partition wall should be provided. It can be mounted in a uniform manner, forms a part of the partition wall, and performs the function of separating the internal space of the single cylinder casing into the upper space in the pipe and the lower end space in the pipe. It should be integrated into a suitable place on the inner peripheral wall in a hermetically sealed shape, and it should consist of an annular body with a vertical funnel-shaped mounting seating surface at the center, more specifically Can be made of steel, stainless steel, etc. that can be integrated by welding, brazing, etc., or synthetic resin, such as vinyl chloride, that can be bonded using adhesives or solvents, etc. And the seating surface is sealed Can be assumed that was formed like mesh or fittable stepped shape or irregular shape but formed to facilitate smooth surface shape outside, in a sealed manner.

    The lower end of the injection pipe is connected to the lower end of the injection ring. The discharge port of the injection pipe is opened in a penetrating manner at the center of the lower end, and the outer peripheral wall surface of the injection pipe can be sealed to the mounting seat surface of the fixing washer. Fits and attaches to form a part of the bulkhead, and also functions to separate the inner space of the single-cylinder casing into the upper space in the tube and the lower space in the tube. The injection pipe outlet is connected to the center of the upper end and opened in a penetrating manner in the center of the lower end. It is formed into a smooth surface that can be joined to the surface in a sealed manner, or a stepped shape or uneven shape that can be meshed or fitted in a sealed shape, and further, a mounting washer for the fixing washer, and an outer peripheral wall surface to be joined thereto Fill with a sealing material to improve sealing It is possible to assume that the.

    The injection pipe serves to guide the heat exchanged groundwater discharged from the heat exchanger so that it can be reduced to the lower end space in the pipe of the single-cylinder casing. From the upper end of the single-cylinder casing to the outside. The discharge end of the exchanger must be connected, and the heat-dissipated groundwater that is pumped up by the submersible pump through the pumping pipe and supplied to the heat exchanger is exchanged in the pumping source underground aquifer. The diameter should be set so that the amount of flowing water can be reduced to a sufficient level, and it should be strong enough to withstand the water pressure that is forcibly supplied by the submersible pump. Carbon steel pipe or black pipe thereof, galvanized steel, or a metal tube, such as stainless steel, or to those made of synthetic resin pipe such as a vinyl chloride pipe is desirable.

    In addition, as shown in the examples described later, the injection pipe has a downward lower end at the discharge end that is penetrating from the upper end center to the lower end center of the frustum-shaped joining ring. The joint seating surface formed on the outer peripheral cone-shaped surface of the joint ring has a downward opening and is composed of an annular body fixed at a suitable position on the inner peripheral wall of the single-cylinder casing, and a vertical funnel-shaped mounting seat in the center. The partition wall body can be integrally formed so as to be sealed and fitted in a fitting manner from the upper side to the mounting washer surface of the fixing washer that forms the surface. The contact force of the joint ring surface of the joint ring with respect to the mounting seat surface can be obtained by the weight of the injection pipe and the joint ring and the pipe strength, and a flange portion is provided at the upper end of the single-tube casing 2, and the flange portion Injection pie into the sealing lid for It can be obtained by various joining maintenance structures, such as those that join the middle part in a penetrating manner and obtain the joining force between the fixing washer and the joining ring by the joining force to the upper end of the single-cylinder casing 2 of the sealing lid, In addition, it is arranged in the upper space in the pipe, the middle part of the injection pipe that is directly above the support frame is bent so as to be close to the inner peripheral wall of the single-cylinder casing, so as to secure the accommodation space for the submersible pump. It is possible to extend the upper end along the inner peripheral wall of the single cylinder casing.

    The support frame has the function of holding the middle position of the injection pipe introduced from the upper end of the single cylinder casing near the center of the single cylinder casing without deteriorating running water conditions. It must be able to support the midpoint of the wall in a fixed manner on the inner peripheral wall of the single-cylinder casing with sufficient strength, as shown in the examples described later, welding and brazing to the outer peripheral wall of the injection pipe, It is integrated by bonding, and its outer periphery is set to a size and shape that allows it to be loosely fitted or joined to the inner peripheral wall of our single-cylinder casing, and has a strength that can sufficiently support the injection pipe It should be set as desired, such as only one in place or a plurality of them at every predetermined length dimension of the injection pipe.

    The pumping pipe has the function of pumping the groundwater flowing into the upper space of the single-cylinder casing up to the ground, and at the lower end of the suction is a depth that sinks into the groundwater flowing into the upper space of the pipe. It is necessary to connect a submersible pump that is arranged in the upper part of the single-cylinder casing pipe and to the discharge end that is led out to the ground. The pipe must have dimensions and shape that can secure a flow rate sufficient to pump up the amount of groundwater required for proper heat exchange, and it must be strong enough to withstand the water pressure that is forcibly drawn up by a submersible pump. Carbon steel pipe for use or its black pipe, galvanized steel pipe, stainless steel pipe or other metal pipe, or synthetic resin pipe such as vinyl chloride pipe. Can.

    The submersible pump is designed to generate pressure in the groundwater that flows into the upper space of the single-cylinder casing so that it can be pumped to near the ground and to be pumped through the pumping pipe. Therefore, it is necessary to set the head so that the amount of groundwater required for the desired heat exchange can be pumped efficiently. It should be selected from those that are unlikely to cause galling due to the entry of foreign matter such as earth and sand. For example, centrifugal pumps, diffuser pumps, spiral mixed flow pumps, mixed flow pumps, piston pumps, plunger pumps, diaphragm pumps, Gear pump, screw pump, vane pump, vortex pump, bubble pump, jet pump, etc. Yibin can be selected.

    The connecting pipe secures the insulation between the discharge end of the pumped pipe and the water supply end of the heat exchanger in a watertight manner, and also connects the drain end of the heat exchanger and the ground pipe end of the injection pipe in a watertight state. The pipe strength must be sufficient to withstand the water pressure generated by the submersible pump, and the diameter should ensure a suitable water flow rate. The area connecting the heat exchanger to the water supply end should be sufficiently insulated by burying it in the ground or installing heat insulating material. If the ground connecting edge is also improved in the same way, it is possible to reduce the thermal effect on the groundwater system, and an open / close valve is interposed at one of these connecting ends. With improved control operability and maintainability Rukoto is possible.

    The heat exchanger performs the desired heat exchange by transferring and dissipating the geothermal heat accumulated in the groundwater pumped up from the underground aquifer, and discharging the same amount of groundwater pumped up and supplied to the injection pipe For example, as shown in the examples to be described later, in addition to a heat-dissipating pipe for snow-melting road heating laid under a paved road surface, a heat pump unit is provided as a tamo to turn off the groundwater heat source. It can be used for various applications such as snow road heating, residential air conditioning, or power generation.

    An underground aquifer is a place where a groundwater system exists, and it can be said that the target ones include anything from a relatively shallow depth of a few meters underground to a depth of several hundred meters. It is also possible to assume a case where the object is an ultra-deep of 1000 meters or more.

    The single-cylinder casing placement process consists of an annular body on the inner peripheral wall of the appropriate depth in the underground aquifer of the single-cylinder casing, and a vertical funnel-shaped mounting seat surface formed in the center. The washer is fixed in a sealed manner, and if necessary, an annular impermeable zone is attached to the appropriate outer wall surface of the single-cylinder casing, and then the ground aquifer is formed by a pre-boring method such as the rotary method or air hammer method. The borehole to be reached is excavated vertically, and a single-cylinder casing is to be placed in the wellhole. Either a single-cylinder casing is driven or multiple single-cylinder casings are driven in addition Regardless of which, the fixing washer should be integrated at a suitable position on the inner wall arranged at a predetermined depth by a joining structure that is most suitable for the casing material, such as welding, brazing, bonding, or bonding. The It is necessary to implant so as to place a portion where fixing washer of the cylindrical casing is secured to the aquifer during.

    The partition body forming process is necessary at the same time that the upper end of the single-cylinder casing is introduced from the upper end center of the junction ring made of a truncated cone that is inverted up and down and integrated into the lower end center. Depending on the location, the midpoint is supported concentrically through one or more support frames that can be passed vertically through the inner wall of the single-cylinder casing, and fixed at appropriate depth positions. The joint seat surface formed on the outer peripheral pyramid surface of the joint ring is sealed downward from above and fitted to the washer mounting seat surface, and is fitted in a single cylinder type upper space in the tube and lower space in the tube In addition, the discharge end of the injection pipe is opened to the space in the lower end of the pipe, and at the same time, the mounting seat surface of the fixing washer and the joint seat surface of the joint ring are separated as necessary. Filled with a sealing material in between, can be sealed more securely It is possible to as.

    The submersible pump installation process is such that the submerged pump at the lower end of the pumped pipe introduced from the upper end of the single-cylinder casing is placed in a suitable place to be submerged in the underground aquifer in the upper space of the pipe, and the support frame of the injection pipe In the case where the midway part that is above the upper part is bent so as to be close to the inner peripheral wall of the single-cylinder casing, the submersible pump is arranged at an appropriate position above the bent part of the injection pipe. It is possible to set it to.

    In the heat exchanger connection process, the heat exchanger is connected via a connecting pipe between the ends of the pumped pipe and the injection pipe that are led out near the ground. More specifically, the heat exchanger is connected to the pavement surface. It can be used as a heat-dissipating pipe for road heating laid underneath, and it can be used for various purposes such as road heating for snow-melting, air-conditioning for homes, and power generation with a heat pump unit provided with a heat pump unit. It is also possible to construct such pipes so that they can be switched and connected via valves as necessary.

The groundwater heat exchange method is based on the pumping process of the upper water of the aquifer. Through the water flow area, the groundwater near the upper middle of the aquifer that flows into the upper space in the pipe separated vertically by the bulkhead is pumped by the submersible pump, and the groundwater pumped through the pumping pipe and the connecting pipe through the subsequent heat exchange process. Supply heat to the heat exchanger, release geothermal heat for use in snow removal and other purposes, and then discharge groundwater discharged from the heat exchanger in the reduction process to the aquifer lower layer water through the connecting pipe and injection pipe Forcing the gas into the space at the bottom of the pipe of the single-cylinder casing to reduce and return to the groundwater near the lower layer in the subsurface aquifer continuously or intermittently over a predetermined time. Is obtained by to set to repeat the start freely in accordance with the required season or daily time zone groundwater heat utilization, it is also possible shall be controlled to stop.
In the following, the structure of the present invention will be described in detail together with an embodiment representative of the present invention shown in the drawings.

    The example illustrated in the front view of the cross-section groundwater heat exchange system in FIG. 1 and the plan view of the support frame in FIG. 2 is a water flow area where the lower end can pass water in the thickness direction over a predetermined range. The single-cylinder casing 2 in which the portion 21 is formed is driven in a substantially vertical shape to the depth at which the water-flow region 21 faces the underground aquifer WB, while the water-flow region in the single-tube casing 2 A partition wall 31 that allows the upper space 22 in the tube and the lower space 23 in the tube to be hermetically separated is disposed at an appropriate position in the vertical direction of the portion 21, and the lower end in the tube penetrates the partition wall 31 in the vertical direction. The injection pipe 3 opened to the space 23 is introduced from the ground opening of the single-cylinder casing 2 through the ground opening of the single-cylinder casing 2, and the water flow area portion is formed in the upper space 22 in the pipe from the ground opening of the single-cylinder casing 2. Suitable for pumping groundwater W flowing in through 21 Up to a depth position, a pumping pipe 4 incorporating a submersible pump 41 is introduced, and between the ends of the ground pipes of the pumping pipe 4 and the injection pipe 3 is connected from the outside by a connecting pipe 51 incorporating a heat exchanger 5. 1 shows a typical embodiment of the groundwater heat exchange system of the present invention, which is connected in an isolated manner.

    The groundwater heat exchange system 1 is. Basically, as described above, the single-cylinder casing 2 that is vertically driven so as to reach the underground aquifer WB, and the injection pipe 3 that is built in the single-cylinder casing 2 and led out to the vicinity of the ground It consists of a connecting pipe 51 with a built-in heat exchanger 5 connected between the ends of the pumped-up pipe 4, and the structure will be explained below in accordance with the construction procedure based on the groundwater heat exchange system construction method of the present invention. I will do it.

    The single-cylinder casing placement process has a diameter that reaches the underground aquifer WB from the appropriate top surface near the heat-dissipating pipe 5 for road heating, which is a heat exchanger laid under the pavement surface to be snow-capped. After drilling a drilling hole BH with D of 193.7 mm into a vertical hole shape of several meters to several tens of meters depending on the depth of the groundwater system, a single-cylinder casing up to the depth reaching the underground aquifer WB 2 is installed, and if necessary, a plurality of single-cylinder casings 2 are installed in accordance with the depth so as to have a concentric vertical cylindrical shape.

    The single-cylinder casing 2 is made of a carbon steel pipe or stainless steel pipe for piping having an outer diameter of 165.2 mm and an inner diameter DI of 155.2 mm, and has a peripheral wall with a tip that reaches into the underground aquifer WB. A water flow area 21 having a plurality of slit holes perforated over a predetermined vertical range is formed, and an OKS applied measurement service stock is provided on the outer peripheral wall surface corresponding to the vicinity of the boundary between the underground aquifer WB and the ground surface GS. In an appropriate place on the inner peripheral wall where the annular impermeable zone 24 having a water absorption and expansion property using the “Nice Seal” (trade name) manufactured by the company is horizontally attached and disposed in the underground aquifer WB, A fixing washer 32 comprising an annular body formed in the shape of a cylindrical surface whose outer peripheral wall surface can be joined to the inner peripheral wall of the single-cylinder casing 2, and having a vertical funnel-type and vertically penetrating mounting seat surface 33 formed in the center thereof. And seal the joints by welding It is assumed that fixed to.

    In the subsequent partition body forming step, it is necessary to introduce the injection pipe 3 to the deep part of the single-cylinder casing 2 before the pumping pipe 4, and before the injection pipe 3 is introduced into the single-cylinder casing 2. In the stage, the frustum-shaped top and bottom are inverted at the discharge end of the injection pipe 3, and the conical ring 34 is set to a shape and size that matches the mounting seat surface 33 of the fixing washer 32. 1 is connected concentrically, and as shown by a wavy line in FIG. 1, the discharge port is opened in a penetrating manner in the center of the lower end surface of the joint ring 34. When mounted in the single-cylinder casing 2 above, the single support frame 6 is concentrically positioned at a suitable position in the middle of the injection pipe 3 disposed in the range where the upper layer of the underground aquifer WB is hidden. In the injection pipe 3 directly above the support frame 6 Bent to direct the portion near the single cylindrical casing 2 inside wall, there as being formed in a crank shape so as to allow derivation in the single tubular casing 2 vertical shape to the upper end.

    As shown in FIG. 2, the support frame 6 has an annular frame-shaped outer frame portion 61 having an outer diameter DS (150 mm) slightly smaller than the inner diameter DI (155.2 mm) of the single cylinder casing 2. A plurality of radiating portions 62, 62,... That can be supported in a fixed manner so as to be arranged around the middle portion of the injection pipe 3 are integrally formed.

    The injection pipe 3 that incorporates the fixing washer 32 and the support frame 6 and has a vertically downward posture is lowered so that the downward discharge end reaches the underground aquifer WB from the upper end opening of the single-cylinder casing 2. The joint bearing surface 35 of the joint ring 34 fixed to the discharge end is mounted so as to be concentrically and watertightly bonded to the mounting seat surface 33 of the fixing washer 32 fixed to the inner peripheral wall of the single cylinder casing 2. In addition, the combination of the fixing washer 32 and the joining ring 34 allows the space in the single-tube casing 2 to pass through the upper space 22 in the pipe that allows water to pass through the upper layer of the underground aquifer WB, and the lower layer than that. A partition wall 31 is formed that is divided into a pipe inner lower end space 23 that can pass through the range of the aquifer WB that serves as a gap, and the injection pipe 3 discharge port is fixed to the center of the single cylinder casing 2 in a downward opening shape. At the same time The support frame 6 is fitted to the inner peripheral wall of the single cylinder casing 2 in the upper space 22 in the pipe, and the support frame 6 mounting portion in the middle of the injection pipe 3 is arranged at the center of the single cylinder casing 2. It will be fixed and supported so that

    The submersible pump installation step is to install the suction end of the pumping pipe 4 in a downward posture in the single-cylinder casing 2 to which the injection pipe 3 is mounted first. A submersible pump 41 is connected to the suction end in a downward posture, and the single cylinder casing 2 is bent in a crank shape above the support frame body 6 in the upper space 22 in the pipe, and the single cylinder type. The pumping pipe 4 is lowered along a vertical space deviated from the middle portion of the injection pipe 3 that is piped upward along the inner peripheral wall of the casing 2, and the submersible pump 41 at the lower end thereof is connected to the underground aquifer WB. It is assumed that it reaches a depth immersed in the groundwater W that has flowed in and is appropriately suspended.

    In the heat exchanger connection process, an opening / closing valve 42 is interposed at the discharge end of the pumped water pipe 4 piped as described above, and the water supply end of the connection pipe 51 of the heat-dissipating pipe 5 for load heating, which is a heat exchanger, is connected. Connect the suction end of the injection pipe 3 to the drain end of the connecting pipe 51 that discharges the heat radiating pipe 5 and connect it to the underground aquifer WB. Shall be formed isolated from the outside.

    As shown in the front view of the groundwater heat exchange system in which a part of the cross section shown in FIG. 3 is changed, the groundwater heat exchange system is an injection pipe disposed in the pipe upper space 22 of the single-tube casing 2. 3. Support frame bodies 6 and 6 may be attached to a plurality of appropriate places at appropriate intervals above and below the midway part.

(Operation of Example)
The groundwater heat exchange system 1 of the present invention configured as described above can be efficiently installed by the groundwater heat exchange system construction method included in the present invention, and its single-cylinder casing placing process Then, with respect to the excavation hole BH drilled in the ground by the pre-boring method, it corresponds to a depth position where the single cylinder casing 2 driven into a vertical posture is slightly above the underground aquifer WB. By attaching the annular impermeable band 24 to the outer peripheral wall surface, the annular impermeable band 24 absorbs the groundwater W after the placement, and the gap between the outer peripheral wall surface of the single-tube casing 2 and the underground wall is reduced. It will be sealed to reliably prevent leakage of groundwater W to the ground.

    Further, the partition body 31 composed of a fixing washer 32 provided on the inner peripheral wall of the single-cylinder casing 2 and a joining ring 34 provided at the discharge end of the injection pipe 3 is used for placing the single-cylinder casing 2. In addition, the installation work of the injection pipe 3 can be performed in a divided manner, the work efficiency of each can be improved, and the conventional pre-boring method can be used as it is for the installation work of the single-cylinder casing 2. This prevents the injection pipe 3 from being deformed or damaged by the work, and the partition body 31 is automatically formed by mounting the injection pipe 3, and the single-cylindrical casing 2 has a pipe upper space 22 and a pipe lower end space 23. And can be separated.

    In the partition body forming step, the partition body 31 is formed of an annular body that is hermetically welded to an inner peripheral wall of a depth-corresponding position in the underground aquifer WB of the single-tube casing 2. A fixing washer 32 having a vertical funnel-shaped mounting seat surface 33 formed in the center, and a frustum shape in which the outer peripheral wall surface is joined to the joint seat surface 35 by reversing the top and bottom, and the discharge pipe 3 has a vertically downward posture. An end is formed from a joint ring 34 that is integrated in a penetrating manner from the center of the upper end to the center of the lower end. The discharge port of the pipe 3 is automatically guided and positioned so as to be arranged in the center of the lower end space 23 in the single-cylinder casing 2 pipe, and is discharged by receiving the supply pressure of the submersible pump 41 from the discharge pipe 3 discharge port. Underground water W is a single cylinder Discharged with substantially homogeneous pressure from the lower end wall of the casing 2 through the water passage area portion 21, it is possible to minimize the degree of the influence of cooling to aquifers WB.

    The injection pipe 3 is guided and supported concentrically on the inner peripheral wall of the single-cylinder casing 2 by the support frame 6 at a midway position located in the upper space 22 in the pipe, and the discharge end of the injection pipe 3 with respect to the single-cylinder casing 2. Can be fixed concentrically, the discharge end of the injection pipe 3 receiving the discharge pressure can be stably fixed to the partition wall 31, and a gap is generated at the joint between the fixing washer 32 and the joint ring 34. It is possible to prevent the leakage of water from the lower end space 2 in the pipe to the upper space 22 in the pipe, and as shown in FIG. 3, the plurality of support frames 6 and 6 are arranged at predetermined intervals. In the provided one, the concentric posture of the injection pipe 3 installed at a large depth can be stably supported, and the inclination of the discharge end of the injection pipe 3 in the partition wall 31 and water leakage caused thereby can be reliably prevented. Become.

    Furthermore, it is assumed that the middle part of the injection pipe 3 disposed in the pipe upper space 22 and directly above the support frame 6 is bent so that the inside of the single-cylinder casing 2 is close to the peripheral wall of the single cylinder casing 2, and the submersible pump installation process The housing space for the submersible pump 41 to be mounted can be secured widely, and the diameter of the single cylinder casing 2 can be relatively reduced.

    In the heat exchanger connection process, the heat exchanger is set on the heat-dissipating pipe 5 for road heating laid under the pavement surface, ground subsidence caused by pumping up groundwater W, depletion of surrounding water sources, groundwater W It is possible to prevent environmental destruction such as pollution of the environment, efficiently extract only the underground heat, and realize economical snow and ice erasure. It can be effectively used as a heat source for building hot water supply systems and power generation systems.

The groundwater heat exchange system 1 of the present invention enables the groundwater heat exchange method included in the present invention to be performed, and the operation will be described below in accordance with the procedure of the snow removal method based on the heat exchange method. I will do it.
The groundwater heat exchange system 1 shown in FIG. 1 performs the pumping process of the upper aquifer by opening the on-off valve 42 and starting the submersible pump 41 in a weather condition in which snow accumulation or road surface freezing occurs. Then, the partition wall 31 passes through the water-passing region portion 21 facing the underground aquifer WB of the single-cylinder casing 2 placed substantially vertically in the aquifer WB at a predetermined depth in the basement. As shown by white arrows in FIG. 1, the groundwater W in the vicinity of the upper middle layer of the aquifer WB is continuously pumped through the pumping pipe 4 into the upper space 22 in the pipe separated vertically. In this case, as shown in FIG. 2, the support frame 6 has an outer frame portion 61 that is in contact with the inner peripheral wall of the single-cylinder casing 2, and each of the radiating portions 62, 62,. Opening the distribution part between the two, the ground water W can freely flow up and down It has become.

    In the subsequent heat exchange process, the groundwater W pumped up through the pumping pipe 4 and the connecting pipe 51 is supplied to the heat-dissipating pipe 5 for load heating, which is a heat exchanger. By transferring geothermal heat to the snow and ice on the top, the function of melting snow or melting ice will be demonstrated, and the entire amount of groundwater W discharged from the heat radiating pipe 5 is connected by the reduction process to the lower layer of the underground aquifer. The pipe 51 and the injection pipe 3 are injected into the lower end space 23 of the single-cylinder casing 2 while maintaining a sanitary state, and are reduced and returned to the groundwater W near the lower layer in the underground aquifer WB. Will be allowed to.

    In this way, the heat-dissipating groundwater W that has been reduced to the vicinity of the lower layer in the subsurface aquifer WB by the reduction process to the aquifer lower layer water is lowered in temperature by heat dissipation during snow-melting, etc., and the subsurface aquifer Naturally, the specific gravity is larger than the original warm groundwater W in the WB, and even if injected and reduced, the upper space 22 in the pipe does not rise, and convection generated by the fall of the radiating groundwater W Around the upper space 22 in the pipe, a phenomenon occurs in which the groundwater W that sufficiently stores geothermal heat is induced and sucked into the submersible pump 41.

(Effect of Example)
The groundwater heat exchanging system 1 according to the embodiment having the above-described configuration has an injection pipe arranged in the upper space 22 in the pipe as shown in FIG. 1 in addition to the features described in the section of the effect of the present invention. 3 Bend the portion directly above the support frame body 6 in the middle so that the inside of the single-cylinder casing 2 is close to the peripheral wall of the single-cylinder casing 2, and extend as it is to the upper end along the inner peripheral wall of the single-cylinder casing 2. The accommodation space of the submersible pump 41 can be set large, the discharge end of the injection pipe 3 is extended to the lower end space 23 in the pipe without increasing the diameter of the single-cylinder casing 2, and the submersible pump 41 is connected to the upper space 22 in the pipe. Compared with a conventional well in which the discharge end of the injection pipe 3 is arranged on the upper side by the submersible pump 41, the heat exchange efficiency of geothermal heat can be increased. Relatively small Effect that a single cylindrical casing 2 can realize the snow melting apparatus of high performance using the.

    In addition, the submersible pump 41 is arranged in the pipe upper space 22 close to the upper end opening of the single cylinder casing 2, and is the maintenance frequency most frequently among the components of the groundwater heat exchange system 1. The high submersible pump 41 can be easily and quickly removed and inspected and serviced, and when it is removed, the on-off valve 42 is closed to minimize leakage of the pumped-up groundwater W. It is effective in protecting groundwater systems and reducing maintenance costs.

    Furthermore, if the injection pipe 3 is pulled up while the submersible pump 41 is removed, the joining ring 34 of the partition wall 31 can be easily detached from the fixing washer 32 and pulled out. Since cleaning and maintenance can be performed efficiently, maintenance costs can be reduced, and the life of the groundwater heat exchange system 1 itself can be extended, making it economical and friendly to the natural environment. A great advantage is that the system can be used over a long period of time.

(Conclusion)
As described above, the groundwater heat exchange system, the method for constructing the groundwater heat exchange system, and the groundwater heat exchange method using the groundwater heat exchange system according to the present invention can achieve the intended purpose evenly by the novel configuration, and are manufactured. The heat exchange efficiency of geothermal heat can be greatly improved compared to a circulating underground device that uses a conventional cooling and reducing liquid as a resuscitation / snow melting geothermal liquid, making it much more economical. In addition, the facility can be downsized compared to the horizontal well of a non-sprinkling snow-melting facility using a thin aquifer, and the conventional pre-boring method can be used as it is for construction. The drilling industry and groundwater industry as well as the snow-melting equipment industry and the energy industry aiming to use groundwater heat because the accumulated boring technology and experience can be fully utilized. It the well, highly regarded in the public snowfall areas have been made, use over a wide range, is expected to be that continue to spread.

The drawings show some typical embodiments embodying the technical idea of the groundwater heat exchange system, the groundwater heat exchange system construction method of the present invention, and the groundwater heat exchange method using them.
1 is a front view showing a cross section of an embodiment of a groundwater heat exchange system. It is a top view which shows the support frame with which the single cylinder type casing was mounted | worn. It is a front view showing a section of a groundwater heat exchange system with some changes.

Explanation of symbols

1 Groundwater heat exchange system 2 Single cylinder type casing
21 Water flow area
22 Upper space in the same pipe
23 Lower space in the pipe
24 Ring-shaped impermeable belt
DI Same inner diameter of single cylinder casing 3 Injection pipe
31 Same partition body
32 Same fixing washer
33 Same seating surface
34 Same joint ring
35 Joint joint surface 4 Pumping pipe
41 Same submersible pump
42 Same open / close valve 5 Heat radiation pipe (heat exchanger) for road heating
51 Same connecting pipe 6 Support frame
61 Same outer frame
62 Radiation part
DS Outer diameter of support frame GL Ground surface GS Ground surface layer of ground WB Underground aquifer
W Groundwater BH Drilling hole
D Diameter of the drilling hole

Claims (9)

    A single-cylinder casing formed with a water-permeable region that allows water to flow in the thickness direction of the peripheral wall with a lower end of a predetermined range is punched in a substantially vertical shape to the depth where the water-permeable region reaches the underground aquifer. On the other hand, a partition body that allows the upper space in the tube and the lower space in the tube to be separated in a sealed manner is disposed at a midway in the vertical direction of the water flow area in the single-tube casing. An injection pipe, which is formed as a through-hole in the upper and lower sides of the pipe, is introduced from the ground opening of the single-cylinder casing through the ground side opening of the single-cylinder casing and is passed through the upper part of the pipe from the ground side opening of the single-cylinder casing. A pumping pipe incorporating a submersible pump is introduced to an appropriate depth where the groundwater flowing through the water area can be pumped, and a heat exchanger is installed between each end of the ground pipe of the pumping pipe and the injection pipe. Outside with connected pipe Groundwater heat exchange system, characterized in that shall become connected to isolated form from.     A single-cylinder casing formed with a water-permeable region that allows water to flow in the thickness direction of the peripheral wall with a lower end of a predetermined range is punched in a substantially vertical shape to the depth where the water-permeable region reaches the underground aquifer. On the other hand, a partition body that allows the upper space in the tube and the lower space in the tube to be separated in a sealed manner is disposed at a midway in the vertical direction of the water flow area in the single-tube casing. An injection pipe, which is formed as a through-hole in the upper and lower sides of the pipe, is introduced from the ground opening of the single-cylinder casing through the ground side opening of the single-cylinder casing and is passed through the upper part of the pipe from the ground side opening of the single-cylinder casing. A pumping pipe incorporating a submersible pump is introduced to an appropriate depth where the groundwater flowing through the water area can be pumped, and a heat exchanger is installed between each end of the ground pipe of the pumping pipe and the injection pipe. Outside with connected pipe The groundwater near the upper middle of the underground aquifer corresponding to the upper space in the pipe pumped up by the submersible pump is supplied to the heat exchanger via the pumping pipe, and the groundwater after the heat exchange is completed. The groundwater heat exchange system is characterized in that it is set to be reduced to the vicinity of the middle and lower groundwater aquifer corresponding to the lower end space in the pipe through the injection pipe.     A single-cylinder casing formed with a water-permeable region that allows water to flow in the thickness direction of the peripheral wall with a lower end of a predetermined range is punched in a substantially vertical shape to the depth where the water-permeable region reaches the underground aquifer. On the other hand, a partition body that allows the upper space in the tube and the lower space in the tube to be separated in a sealed manner is disposed at a midway in the vertical direction of the water flow area in the single-tube casing. In order to make the center of the flat shape vertically penetrated, it was opened to the lower end space in the pipe through a support frame body arranged in parallel at an appropriate position in the upper space in the pipe at an appropriate interval from the partition wall. Introduce the injection pipe from the above ground opening of the single-cylinder casing to the appropriate depth position where the ground water flowing from the ground side opening of the single-cylinder casing through the water flow area in the upper space in the pipe can be pumped , A pumping pipe incorporating a submersible pump The groundwater heat exchange system is characterized in that the ends of the ground pipes of the pumping pipe and the injection pipe are connected to each other in isolation from each other by a connecting pipe incorporating a heat exchanger. .     The partition body is an annular body that is in close contact with a suitable position on the inner peripheral wall of the single-cylinder casing, and is provided with a fixing washer having a vertical funnel-shaped mounting seat surface at the center thereof, and the mounting seat for the fixing washer A frustum shape with the tip cut off from the surface and turned upside down. The lower end of the injection pipe is connected to the center of the upper end, and the discharge port of the injection pipe is opened through the center of the lower end. The groundwater heat according to any one of claims 1 to 3, wherein the joint seating surface formed on the outer circumferential cone-like surface is sealed from below and joined in a fitting manner in a ring. Exchange system.     The injection pipe shall be bent and arranged so that any one of the inner peripheral walls of the single-cylinder casing approaches and deviates from the middle part directly above the support frame. The groundwater heat exchange system according to any one of claims 1 to 4, wherein an accommodation space for the submersible pump is secured in an extra portion.     The outer wall surface of the single-cylinder casing, which is near the boundary between the upper stratum and the underground aquifer below it, is fitted with an annular impermeable belt that allows the gap between the inner wall of the excavation hole to be closed in a sealed manner. The groundwater heat exchange system according to any one of claims 1 to 5.     The groundwater heat exchange system according to any one of claims 1 to 6, wherein the heat exchanger is configured as a heat-dissipating pipe for road heating laid under a paved road surface.     A water passage area that allows water to flow in the thickness direction of the peripheral wall over a predetermined range is formed at the lower end of the water passage area. A single washer casing having a mounting washer surface is fixed in a sealed manner, and a single cylindrical casing is provided with an annular water-impervious belt at an appropriate position on the outer peripheral wall surface above the water flow area. The plane of the joint ring in the shape of a frustum that is inverted vertically and performs a single cylinder casing placement process, in which the entire area is placed almost vertically up to the optimum depth that reaches the underground aquifer Insert the injection pipe with the center of the pipe vertically integrated into the top and bottom of the single-cylinder casing, and if necessary, place the middle part of the injection pipe in close contact with the appropriate position on the inner wall of the single-cylinder casing. Concentrically through one or more support frames that allow water to pass In addition, the joint seat surface of the joint ring is fitted from the upper side to the mounting seat surface of the fixing washer provided at a predetermined depth position in the water flow area portion in advance, and the inside of the single cylinder casing is in the pipe Pumping water separated from the upper space and the lower end space in the pipe, and at the same time the partition body forming process was performed such that the discharge end of the injection pipe was opened to the lower end space in the pipe, and then the upper end of the single cylinder casing was introduced from the side The submersible pump at the lower end of the pipe is placed in a suitable place where it is submerged in the underground aquifer in the upper space of the pipe. A connecting pipe with a built-in heat exchanger is arranged and connected between each end of the ground hood so that the pumping pipe and the injection pipe communicate with each other in an isolated manner from the outside. 1 to Construction method of underground water heat exchange system set forth in any one.     A single-cylinder casing placed in a substantially vertical shape so that the water flow area reaches the underground aquifer, and the underground space where the upper space in the pipe separated vertically by the partition wall faces in the water flow area. The groundwater above the aquifer is pumped up by the submersible pump of the pumped pipe located in the upper space of the pipe, and the groundwater pumped through the pumped pipe is heat-exchanged through the connecting pipe. After the heat exchange process to discharge the geothermal heat by supplying to the vessel, the groundwater after heat exchange is forced to the lower end space in the single cylinder casing through the injection pipe via the connecting pipe A series of steps to perform the reduction process to the aquifer lower layer water that is guided and injected into the groundwater that is lower than the previous pumped water in the subsurface aquifer. To Characterized in that to return, claims 1 to 7 any one groundwater heat exchange method according groundwater heat exchange system according.

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