WO2011015342A1

WO2011015342A1 - Geothermal probe mounting device

Info

Publication number: WO2011015342A1
Application number: PCT/EP2010/004744
Authority: WO
Inventors: Guido Kania
Original assignee: Rehau Ag + Co
Priority date: 2009-08-06
Filing date: 2010-08-03
Publication date: 2011-02-10
Also published as: DE102009036324A1

Abstract

The invention relates to a geothermal probe mounting device (1) for introducing a geothermal probe (2) into the ground, comprising at least one geothermal probe (2) having a probe head (2c) which connects a flow part (2a, 2d) and return part (2b, 2e) of a geothermal probe pipe arrangement together in a liquid-tight manner. Said device is characterised in that the probe head (2c) is secured to an advancing head (3) which is associated with a drilling rocket (5) in such a manner that the impact energy thereof reacts with said advancing head.

Description

Geothermal probe mounting device

The invention relates to a geothermal probe installation device which is adapted to install a geothermal probe in the ground. Furthermore, the invention relates to a method for introducing a geothermal probe in the ground using a Erdwärmeson- deneinbauvorrichtung and means for obtaining or storing geothermal ge with a geothermal probe, which introduced by the method for introducing a geothermal probe in the ground using a geothermal probe mounting device is.

Geothermal probes serve to extract heat energy from the soil or to store heat energy in the soil. Another application is to dissipate waste heat from cooling processes.

For this purpose, the heat transfer is accomplished by means of a fluid, which is passed in a pipe arrangement. Thus, for example, so-called U-probes are known in the form of two approximately parallel to each other in approximately perpendicularly introduced into the ground pipes, one of the tubes as a feed and the other tube serves as a return.

The tubes are connected at their foot end, that is, the lowest part in the ground, by a generally U-shaped deflection, which can be designed as a probe foot and the flow of fluid from the flow to the return allows connected.

Another known type of geothermal probes is the so-called coaxial probe.

In this case, a tube arrangement is selected in which an outer tube and an approximately coaxially received in the lumen of the outer tube inner tube is provided.

The outer tube is closed at its lowest point in the ground.

The liquid flow is then formed between the inner and outer tubes.

Such geothermal probes are typically installed in depths of up to about 300 m and more in the ground. Due to the prevailing in deep soil layers constant and increasing in particular increasing temperature levels geothermal probes are preferably installed as low as possible.

For this purpose, a hole is first drilled with the aid of a suitably suitable drill, and after reaching the desired depth drill head and drill pipe are removed from the well produced. The geothermal probe is then sunk into this hole and filled the remaining annular gap between the inner surface of the borehole and geothermal probe with a suitable filling material.

With this backfilling the thermal connection of the geothermal probe is made to the ground, so that they can effectively absorb heat energy from the ground or give it to this.

The work processes that are associated with the production of the borehole, so include the actual drilling process, as well as the preparation of the borehole for the geothermal probe to be introduced and also the operation of filling the borehole after introducing the geothermal probe require on the one hand a considerable amount of space to There, the required equipment on or off, as well as space is needed to bring equipment to the well, finally, more space is needed to create, for example, the Bohrteich. The drilling pond is required to rinse and receive the drill bit from the wellbore.

The production of boreholes in existing buildings, ie on built, planted or otherwise used areas is therefore always associated with their dismantling or destruction.

Furthermore, under certain conditions, it is not possible to drill, for example, if there is insufficient space or can be created to set up the drill. This can be caused by lack of space as well as lack of clear height at the drilling site. This significantly limits the possibility of increasingly using geothermal probes in such places.

Object of the present invention is therefore to provide a Erdwärmesondeneinbauvorrichtung that overcomes the above-mentioned disadvantages, that is operable without the need for large and extensive equipment, and in particular allowed to install geothermal probes in the ground, without the existing building stock to a considerable extent affected become. The geothermal probe mounting device should also be able to be used in places where the space available in the above-mentioned sense is extremely scarce.

Another object of the invention is to provide a method for introducing a geothermal probe into the ground using such a geothermal probe mounting device.

Finally, it is an object of the invention to provide a means for obtaining or storing geothermal heat with at least one geothermal probe, which is introduced into the ground after the method for introducing a geothermal probe into the ground using such a geothermal probe installation device.

The solution of the problem succeeds according to claim 1.

According to the invention, the geothermal probe installation device for introducing a geothermal probe into the ground, which has at least one geothermal probe with a probe head, which fluid-tight flow and return of a geothermal probe tube assembly interconnects, which is characterized in that the probe head is set in a propellant head, wherein the propellant head an earth rocket is assigned such that their impact energy acts on him.

In the context of the present invention, it is accordingly provided that the free space in the ground, which serves to receive the borehole heat exchanger tube arrangement, is produced by means of a drive head, to which an earth rocket is assigned.

The Erdrakete is a known from the prior art device which acts by means of a pneumatic, hydraulic or electric drive by impact energy such that it moves through soil layers, in this way creates a free space through the soil layer, which then usable is. In the area of so-called horizontal bores, where, for example, a road is to be undercut by a line, such free spaces or cavities are produced with the aid of ground rockets.

In the present invention, it is now provided that the probe head of the geothermal probe tube assembly is fixed to the propellant head.

This causes that the penetration of the propellant head into the ground, which is initiated by the propulsion head associated Erdrakete, the geothermal probe tube assembly is drawn with in the free space thus created.

The propellant head absorbs impact energy of the earth rocket and displaces the ground creating a free space into which the geothermal probe installation device successively penetrates more deeply.

As techniques for fixing the probe head of the heater probe tube assembly to the propellant head, welding, gluing, riveting, screwing, clamping, clamping, and the like are possible. suitable.

In an advantageous embodiment of the geothermal probe mounting device is provided that the probe head is fixed non-positively in the propellant head.

It is hereby possible that a particularly effective pulling the geothermal probe tube assembly by the propellant head into the free space, which was generated by displacement of the soil by the propellant head takes place.

According to the invention it can be provided that the probe head is fixed by means of at least one screw in the driving head.

The provision of a screw for fixing the probe head in the driving head is particularly advantageous if this is to be carried out on the construction site. It is particularly easy, fast and safe to set the probe head in the propellant head in this way. It is also included and advantageous in a modification of the invention if at least one tube of the borehole heat exchanger tube arrangement is fastened to a section in a force-locking manner on or in the driving head at least in a region near the probe head.

In this case, the connection or the transition between the at least one tube of borehole heat exchanger tube assembly and the probe head is not burdened by tensile forces, but then the tensile forces then act exclusively on the pipe.

It has been found in the context of the present invention that it is particularly advantageous if the propellant head is designed such that the penetration into the soil and / or the displacement of the soil is facilitated.

With this measure, a particularly effective installation of geothermal probe tube assembly can be achieved in the ground. It may be provided according to the invention that the propellant head is designed tapering in the direction of penetration.

It may thus result in a particularly rapid displacement of soil, resulting in a fast and thus cost-optimized installation of the geothermal probe tube assembly. In the direction of penetration, that is, in the direction in which the propellant head is moved by means of Erdrakete in the ground, pointed driving head designed, for example, cone or frustoconical, arrow-shaped, prismatic or be designed in the form of a partial ellipsoid of revolution. It is essential in the context of the present invention that the cross section of the propellant head at the end located in the direction of penetration, which is designed tapered, is substantially smaller than at the opposite end, at which the geothermal probe tube assembly is dragged.

It has also been found in the context of the present invention advantageous if the propellant head has a lubricious or lubricious coated surface.

With a lubricious coated surface of the propellant head, it is possible - especially in different soil types - to bring about rapid and thus effective laying of the geothermal probe tube assembly in the ground. As a lubricious coating on the surface of the propellant head is used in particular a layer of a polymer material, which is also tough and has a low coefficient of sliding friction. For example, polyamide is very well suited for this purpose.

Other polymer materials such as halogenated, in particular fluorinated hydrocarbons (for example Teflon), are suitable for this purpose. Alternatively, however, it can also be provided if the surface of the propellant head is slidable.

This can be done in particular by polishing the surface of the propellant head. Furthermore, it can be provided that the propellant head is designed with respect to its surface in such a way that it is as homogeneous as possible, that is, has no cracks or bulges.

In the context of the present invention, it is further provided that the propulsion head has an element for receiving the impact energy of the earth rocket.

The provision of an element for receiving the impact energy of the earth rocket in the propellant head is advantageous in that the impact energy provided by the rocket is brought into effect very effectively in the propellant head. For this purpose, it is provided in particular that the element for receiving the impact energy is arranged at the penetrating end of the propellant head.

With this embodiment of the present invention, it is possible that the production of the free space, which serves to retract the geothermal probe tube assembly, is particularly fast to produce. In the context of the present invention, it can further be provided that the earth rocket can be operated in such a way that the resultant of the force vector introduced into the geothermal probe installation device by the earth rocket points in a direction deviating from the longitudinal axis of the installation device, and thus the installation device is curved during installation , For example, describes hyperbolic or parabolic web. It is thus possible to install several geothermal probes in the ground so that they are far away from each other at their feet, but for example, end up in a common shaft structure, which greatly reduces the technical complexity of the connections and their maintenance. The greatest possible distance between the bases of several geothermal probes is of course preferred under the aspect of the most efficient possible energy generation.

However, it can also be advantageously provided to install a plurality of geothermal probes from a common shaft structure in the ground in such a way that they are essentially straight, that is to say they are essentially flat. H. not curved forward movement in the ground just by starting in a direction oblique to the earth's surface position in the direction you want. Even so, it succeeds without problems to place the bases of geothermal probes far from each other and thus to make their operation effectively. The drawn with the help of Erdwärmesondeneinbauvorrichtung invention in the produced space geothermal probe can either be a so-called U-probe, in which the tubes for flow and return are arranged approximately parallel to each other. Alternatively, the geothermal probe may be a coaxial probe in which an outer tube and an inner tube approximately coaxially fixed therein are formed.

The geothermal probe tubes dragged behind the propellant head can have a special sliding layer (for example, one containing Teflon and / or fluoropolymers and / or silicone-containing compounds, etc.) on the outer surface of the tubes to allow better penetration in the soil.

The ground rocket provided in the geothermal probe installation device can be operated electrically or hydraulically or pneumatically or in a combination of the aforementioned. It is thus possible, depending on the available drive energies to operate the earth rocket accordingly.

In a preferred embodiment of the present invention may further be provided that a Verfüllleitung is provided, which serves for filling the created by the displacement of the soil free space next to the geothermal probe with a Verfüllma- material.

Preferably, the backfill is drawn parallel to the geothermal probe tube assembly into the ground. After the desired installation depth is reached and after further measures have been taken, then the free space between the inner wall of the wellbore and the geothermal probe tube assembly with a backfill material, such as bentonite, be filled using the Verfüllleitung. In a further development of the invention can also be provided that the hydraulic or pneumatic line, which supplies the Erdrakete with energy, remains after the introduction of geothermal probe in the ground and is used for introducing a suitable material for backfilling the remaining free space. For this purpose, it is provided that the hydraulic or pneumatic line can be decoupled from the Erdrakete distant effect. In this case, it can then be waived to provide a separate backfill.

With the introduction of the filling material, the thermal connection of the geothermal probe is reached to the surrounding soil.

The method for introducing a geothermal probe into the ground using a geothermal probe installation device is characterized in that a Erdwärmeson- deneinbauvorrichtung of the aforementioned type provided and at the Einbringort, d. H. at the place where the geothermal probe is to be introduced into the ground, is placed.

Subsequently, the Erdrakete is operated to introduce the geothermal probe into the ground and created by displacing the soil a free space. Into the free space penetrates the geothermal probe installation device successively until the desired depth of penetration is reached in the ground. It is thus possible to install geothermal probes in all types of soil, only in pending rock, the technique described above is not applicable.

Of great advantage here is that the soil is compacted in this technique by the displacement process and thus has a higher thermal conductivity.

The operation of geothermal probes is thereby more effective.

After the desired depth of penetration into the ground has been reached, the earth rocket can be removed from the space created by displacement of the ground.

It is thus possible to use the Erdrakete for the installation of the next geothermal probe tube assembly again.

According to the invention may be provided in a development that the propellant head is fixed asymmetrically or eccentrically or at a defined angle to the probe longitudinal axis, so that the probe describes a defined arc during movement through the ground during installation.

As a result reach from a start pit from the individual probes a best possible distance without mutual interference. This makes it possible to achieve a higher degree of effectiveness in the operation of the individual probes.

It can also be advantageously provided that the unwinding of the probe head to the axis in which the propellant head moves, is remote-controlled adjustable and thus the installation is controlled.

Thus, the path of the earthquake probe can be specified in the ground, so that a particularly favorable installation in the ground can be done.

The invention also includes that the propellant head can be located by an integrated active or passive transmitter or transponder or reflector.

It is thereby advantageously possible to terminate the installation of the geothermal probe into the ground upon reaching a defined target point (e.g., at a property boundary).

According to the invention, it is provided that the means for supplying energy to the earth rocket can be decoupled from the earth rocket when the desired penetration depth in the ground has been reached. The decoupling can be controlled by remote control or, for example, by a certain movement of the means for supplying power to the earth rocket, for example by movement of the tube in the form of a rotary movement.

The means for powering the earth rocket, if this is a hose, as it is selected in the pneumatic or hydraulic operation of the earth rocket, be used after uncoupling of the earth rocket for filling the remaining free space in the ground.

For this, the filling material is pumped through the hose and exits at its end. The filling material is thereby introduced into the remaining free space and distributed there, with the thermal coupling takes place on the wall of the space generated by displacement of the soil free space. The filling material is, for example, bentonite, which due to its low viscosity can completely fill the remaining free space.

Due to its swelling capacity, the complete filling of the remaining free space is advantageously supported.

A device for obtaining or storing geothermal heat with at least one geothermal probe, which is introduced into the ground according to the method described above, is likewise encompassed by the present invention.

The invention will be explained in more detail below with reference to two figures:

Fig. 1 shows a cross section through a geothermal probe installation device in a first embodiment of the invention;

Fig. 2 shows a cross section through a geothermal probe installation device in a second embodiment of the invention. 1 shows a borehole heat exchanger installation device 1 in a cross section, which comprises a geothermal probe 2.

The geothermal probe 2 has a tube 2a, which serves as a flow for the geothermal probe. Furthermore, a pipe 2b is provided which represents the return of the geothermal probe. The probe head 2c connects the two tubes 2a and 2b of the geothermal probe. 2 The geothermal probe 2 is fixed in the propellant head 3 by means of a fastening means 4 on the probe head 2c. The propellant head 3 has an end 3a, which is designed tapering.

In Fig. 1 it is shown that the end of the propellant head 3a is designed stepped tapered. The propellant head 3 further has a hull 3b, which is larger in cross-section than the end of the propellant head 3a.

The tubes 2a, 2b of the geothermal probe 2 protrude from the fuselage of the propellant head 3 approximately in the axis in which the propellant head penetrates with its pointed end designed into the ground.

The geothermal probe mounting device 1 further comprises an earth rocket 5, which is associated with a means for supplying energy to the earth rocket 5a. In Fig. 1 it is shown that the means for energizing the Erdrakete 5a is a hose.

The propellant head 3 further comprises an element for receiving impact energy 6. The earth rocket 5 transmits its impact energy to the element for receiving impact energy 6.

Under the influence of the rocket 5 acting on the element for receiving the impact energy 6, the propellant head 3 with its pointed end can penetrate into the ground and thereby retract the borehole heat exchanger 1 into the free space created by displacement of the ground.

2 shows a cross section through a borehole heat exchanger installation device 1 in a second embodiment of the invention.

Reference numerals for the same components correspond to each other. In the geothermal probe mounting device 1, a geothermal probe 2 is fixed by means of a fastening means 4 on the probe head 2c. The geothermal probe 2 has a tube 2d, which is used as a feed of the geothermal probe.

A tube 2e, which is approximately axially fixed in the tube 2d, serves as a return of the geothermal probe. The propellant head 3 is configured as described above under FIG. 1.

Likewise, it is provided in this embodiment of the invention that the earth rocket 5, which has a means 5a for supplying energy to the earth rocket 5, here in the form of a hose, acting on a member for receiving impact energy 6, which is assigned to the propellant head 3 ,

Under the influence of acting on the element for receiving the impact energy 6 Erdrakete 5, the propellant head 3 can penetrate with its pointed end designed into the ground and thereby collect the geothermal probe 1 in the space created by displacement of the soil free space.

- Claims -

LIST OF REFERENCE NUMBERS

1 geothermal probe installation device

2 geothermal probe

2a Flow of the geothermal probe

2b Return of the geothermal probe

2c probe head

2d supply of geothermal probe

2e return of the geothermal probe

3 propulsion head

3a end of the propellant head

3b Fuselage of the jacking head

4 fasteners

5 Earth Rocket

5a means for powering the earth rocket

6 element for absorbing impact energy

Claims

claims

1. geothermal probe installation device 1 for introducing a geothermal probe 2 in the ground, which has at least one geothermal probe 2 with a probe head 2c, the fluid-tight flow 2a, 2d and return 2b, 2e a geothermal probe tube assembly interconnected, characterized in that the probe head 2c in a propellant head 3 is fixed, wherein the propellant head 3, an earth rocket 2 is assigned such that their impact energy acts on him.

2. geothermal probe mounting device 1 according to claim 1, characterized in that the probe head 2c is fixed non-positively in the propellant head 3.

3. Erdwärmesondeneinbauvorrichtung 1 according to claim 1 or 2, characterized in that the probe head 2c is fixed by means of a fastening means 4, in particular in the form of a screw in the propellant head 3.

4. Erdwärmesondeneinbauvorrichtung 1 according to any one of claims 1 to 3, characterized in that the propellant head 3 is designed such that the penetration into the soil and / or the displacement of the soil is facilitated.

5. geothermal probe mounting device 1 according to claim 4, characterized in that the propellant head 3 is designed tapering in the direction of penetration.

6. Erdwärmesondeneinbauvorrichtung 1 according to claim 4 or 5, characterized in that the propellant head 3 has a lubricious or lubricious coated surface.

7. Erdwärmesondeneinbauvorrichtung 1 according to any one of the preceding claims, characterized in that the propellant head 3 has an element for receiving the impact energy 6 of the ground rocket 5.

8. Erdwärmesondeneinbauvorrichtung 1 according to claim 7, characterized in that the element for receiving the impact energy 6 is arranged at the penetrating end of the propellant head 3.

9. Erdwärmesondeneinbauvorrichtung 1 according to any one of the preceding claims, characterized in that the geothermal probe 2 is a U-probe, in which the tubes for flow 2a and return 2b are arranged approximately parallel to each other.

10. Erdwärmesondeneinbauvorrichtung 1 according to any one of claims 1 to 8, character- ized in that the geothermal probe 2 is a Koaxialsonde, in which an outer

Pipe 2d and an approximately coaxially fixed therein inner tube 2e are formed.

11. Erdwärmesondeneinbauvorrichtung 1 according to any one of the preceding claims, characterized in that the Erdrakete 5 is operated electrically or hydraulically or pneumatically or in a combination of the aforementioned.

12. Erdwärmesondeneinbauvorrichtung 1 according to any one of the preceding claims, characterized in that a Verfüllleitung is provided, which serves for filling the created by the displacement of the soil free space with a Verfüllma- material.

13. A method for introducing a geothermal probe 2 into the ground using a borehole heat exchanger installation device 1 according to one of claims 1 to 12, wherein the borehole heat sink fitting device 1 is provided and placed at Einbringort, then operated for introducing the geothermal probe 2 in the ground, the rocket 5 and by displacing the soil a free space is created, in which the geothermal probe fitting device 1 penetrates until the desired insertion depth is reached in the ground.

14. The method of claim 13, wherein the earth rocket 5 is removed after reaching the desired insertion depth of the geothermal probe mounting device from the space created by displacement of the ground free space.

15. means for obtaining or storing geothermal heat with at least one geothermal probe 2, which is introduced according to one of claims 13 or 14 in the ground.