DE102006011161A1 - Stable probe foot for a ground probe - Google Patents

Abstract

The plate has a threaded hole (9) in a metal piece for fixing an injecting frame, where force from the hole is directly transferred over a threaded rod (2) e.g. metal rod, to a lower end of a pressure plate (5). The metal piece is designed as a wing nut. Tubes (6, 7) are clamped /bent between a retaining plate and a wing of the wing nut. A lock nut exercises less pressure on crossbars of the tubes. A foot is foamed with a resin compound or a plastic.

Description

geothermal probes become the use of geothermal energy as a heat exchanger pushed into a well drilled deep into the ground. there consists of the heat exchanger e.g. one or two parallel pipe sections comprising a flowable heat transfer medium e.g. Lead brine. A tube serves as a feed pipe to the probe foot and a Pipe as return pipe. The return pipes are in the probe foot with each other connected. The flowing one Heat carrier loads while flowing through the long pipes with geothermal energy. The tubes are thermodynamic with the evaporator of a heat pump coupled. This deprives the heat transfer the for evaporation of the refrigerant required heat.

Of the Probe foot has essentially to accomplish two tasks. He should inlet and return pipes preferably without increase the flow resistance connect to each other and he should push the tubes into the Borehole without damage enable.

As prior art, for example, the following solutions have been proposed for probe feet:
In the Swiss patent CH 687 268 A5 It is proposed to form the probe foot by an integrally formed by 180 ° deflected plastic tube whose inner surface has no sudden constrictions. The probe foot according to this patent provides little protection against damage during insertion into the borehole and no device for pushing with force via a rod.

In utility model DE 296 134 50 U1 is a probe foot entirely made of plastic described. Two made of solid plastic parts are joined together by mirror welding. This solution is expensive to manufacture and the weld is problematic in terms of strength in introducing the probe into the soil.

In utility model DE 299 12 335 U1 The pipe deflections are embedded in a protective body of resin-fine gravel mixture. Even with this, forces when inserting or retracting the probe onto the pipe system can not be avoided.

The Utility Model DE 200 21 105 U1 shows a probe foot formed of plastic, which is connected to the inlet and return pipes by welding. Thus, there is no good decoupling for forces when inserting or necessary retraction of the probe head in the borehole.

The Utility Model DE 202 02 578 U1 has as a feature a one-piece connection between inlet and return pipes and a sheath of thermoset or fiber-reinforced duromers. Advantages over the solutions listed above are not apparent.

At the heart of the European patent application EP 1 387 130 A1 is a fixing with recesses, the pipe sections add in the axial direction. The fixing has a center abutting surface for an insertion rod. Very disadvantageous in this solution is that both the forces during insertion into the wellbore on the lower end of the Son foot as well as the forces in the event of retraction on the tubes must be transmitted. Damage to the probe base in difficult boreholes is inevitable.

task

task It is the object of the present invention to provide a probe foot for a ground probe to create in difficult holes over the Injiziergestänge with greater Force (up to several tons) without damaging the connections between Inlet and return pipes can be inserted and retracted if necessary without damage can.

Is solved This object with the features stated in the characterizing part of claim 1. Advantageous developments of the invention are specified in the subclaims.

Of the Probe foot bears at the top End of a piece of metal with four wings and a threaded bore for receiving the Injiziergestänges. The injection rod serves as a push rod when introducing the ground probe in the well. The piece of metal with four wings is over a rod z.b. made of metal, rigid with the pressure plate at the bottom End of the probe foot connected. Will with great Force pressed on the probe foot, then This power is transferred directly over transfer the metal rod to the pressure plate at the bottom of the foot. On the connections between inlet and return pipes affects only the Force required to take them with you. The pressure plate has in the middle a threaded hole. In it can draw weights attached become. Likewise Adapter to be screwed in for the admission commercially Drawing weights are suitable.

Of the Probe foot becomes for external protection expediently potted or foamed with plastic or resin mixtures. there runs the Protective jacket from the pressure plate upwards as a cone - the truncated pyramid with an angle smaller than the self-locking angle. A short one Piece to upper end of the probe foot is as a reverse cone - or Truncated pyramid formed so that the withdrawal can be easily done.

embodiment

Based on 1 to 4 an embodiment of the invention will be explained.

It demonstrate:

1 : An inlet and return pipe belonging to the probe foot with its connection

2 : The rod between the wing nut and the pressure plate, which serves as force transfer in the ground probe foot

3 : Arrangement and fastening of two inlet-return pipe pairs.

4 : Protective cladding of the probe foot formed as a double truncated pyramid.

To 1 : The inlet-return pipe pair ( 6 ) is connected to each other via a cross piece. The protruding from the probe foot ends are different lengths, so as not to interfere with commercial welding sleeves, which are connected to the pipes coming from the coil on the site.

To 2 : 2 shows the rod ( 2 ) for direct transmission of the thrust force of the Injizierungsgestänges on the pressure plate ( 5 ) when inserting the probe foot into the drill hole. From the threaded hole ( 9 ) in the wing nut ( 1 ) is the force on the threaded rod ( 2 ) on the printing plate ( 5 ) transfer. Between the retaining plate ( 3 ) and the wings of the wing nut ( 1 ) can be stretched two pipe pairs. The locknut ( 4 ) exerts slight pressure on the cross pieces of the tube pairs.

To 3 : 3 shows the attachment of the pipe pairs ( 6 ) and ( 7 ) in the probe foot. The raw pairs are inserted between the wings of the wing nut ( 1 ) and the retaining plate ( 3 ) clamped. The lock nut exercises ( 4 ) a slight pressure on the tube pairs ( 6 ) and ( 7 ) out.

To 4 : 4 shows a complete probe foot. For external protection, the pipe pairs ( 6 ) and ( 7 ), eg with plastic. The shape is a double truncated pyramid ( 8th ) with a short stump up and a long stump down. The slopes are formed at an angle below the self-holding angle. At the upper part of the probe foot you can see the threaded hole ( 9 ) for the attachment of the Injiziergestänges. The pressure plate below has the threaded hole ( 10 ). Here train weights can be fastened for easy entry into a borehole.

Claims (9)

Erdsondenfuß for the introduction of a geothermal probe into a well with eg four connections for the connection of two pipe pairs, which are redirected in Erdsondenfuß characterized in that the Erdsondenfuß in the middle of a threaded hole in a metal piece for attachment of the Injiziergestänges and from here the force on a rod such as a metal rod is transferred directly to a pressure plate at the bottom of Erdsondenfußes. Erdsondenfuß after Claim 1, characterized in that the upper metal piece as a wing nut is formed and the four wings the four pipe connections keep at a distance. Erdsondenfuß after Claims 1 and 2, characterized in that the rod in the Center of the geothermal foot designed as a threaded rod is. Erdsondenfuß after the claims 1 to 3, characterized in that the deflections of the pipe pairs by gently clamping between the arms of the wing nut and a retaining plate being held. The retaining plate is fixed by a locknut. Erdsondenfuß after the claims 1 to 4, characterized in that the Erdsondenfuß for external protection molded with plastic or resin mixtures or with plastic lathered is. Erdsondenfuß after the claims 1 to 5, characterized in that the outer shape is a double truncated pyramid with a short stump up and a long stump down is. Erdsondenfuß after the claims 1 to 5, characterized in that the outer shape is a double truncated cone with a short stump up and a long stump down is. Erdsondenfuß after the claims 1 to 7, characterized in that the slopes of the pyramid or truncated cones with Angles are formed below the self-holding angle. Erdsondenfuß after the claims 1 to 8, characterized in that the pressure plate at the bottom End of the geothermal foot has a threaded hole in the draw weights or adapters for commercial draw weights can be attached.