DE202004014113U1 - Concrete pile foundation for absorbing geothermal energy, contains corrugated sleeve pipe - Google Patents

Abstract

The sleeve pipe (5) is corrugated over at least part of its length, preferably over most of its length. The sleeve pipe is set into the concrete body (3) and contains an inner pipe (15). Conduits (1) for a heat carrying medium are located in the ring-shaped cavity (11) between the inner pipe and sleeve pipe, as well as in the inner pipe.

Description

The Invention relates to a concrete foundation element of a building, being used to form the concrete foundation element as an energy absorber a cladding tube in a concrete body of the concrete foundation element is arranged and within the cladding tube an inner tube runs, the annular space between the cladding tube and the inner tube and the interior of the inner tube form lines for a heat transfer medium.

The Term "energy absorber" is used for facilities used to absorb and / or release thermal energy. This includes, for example, energy piles, etc. Such energy absorbers are also called geothermal probes designated.

It energy absorbers (geothermal probes) are known, the dimensionally stable to form a heat exchanger Use pipes that are inserted into a borehole in the ground and with a pouring compound to make a thermally conductive contact with the Soil to be shed. It is known to use pairs of pipes here, which have a connecting bend or a connecting piece at their lower end. One pipe forms the supply line, the other pipe the return line. It can be in several pairs of pipes are used in a borehole their lower end one or more fittings as a connecting element exhibit.

Furthermore, dimensionally stable tubes which are arranged coaxially one inside the other have also been used in such energy absorbers. The outer tube is closed at its lower end and the annular space between the outer tube and the inner tube forms the feed line, while the interior of the inner tube forms the return line for the heat transfer medium. An energy absorber of this type is from, for example DE 29 28 414 A1 known. With such energy absorbers, pipes of the required lengths can neither be transported nor stored and must therefore be assembled from individual pieces on site. In addition to the high assembly effort and the assembly time required, the disadvantage here is, among other things, the difficult quality assurance in the context of a construction site operation.

at Another type of energy absorber are concrete foundation elements trained as energy absorber by buildings. It can do this are ready-made foundation elements that directly into the Soil can be hammered in without first forming a borehole. The concrete foundation elements have a concrete body an inner cavity, into which pipes as supply or discharge for the Heat transfer medium be introduced. Training is already known in which the annular space between the wall of the foundation element and an inner tube as a feed line and the interior of the inner tube as return serves.

A foundation element of the type mentioned at the beginning, which is designed as an energy absorber, is made, for example, of one of the layers in FIG EP 582 118 A1 described embodiments known. In the cavity of a foundation element, in particular in the form of a concrete pile, a line system made of dimensionally stable pipes is introduced and the free space between the line system and the wall of the cavity of the foundation element is filled with a filling material. In one exemplary embodiment, the line system has an outer cladding tube and an inner tube arranged inside the cladding tube.

task The invention is an improved energy absorber at the beginning provide mentioned type, which has a high heat transfer. Successful according to the invention this by means of an energy absorber with the features of claim 1.

By the curl according to the invention of the at least one cladding tube the stiffness of the pipe wall is increased. This enables the wall thickness to keep comparatively low. Furthermore, due to the corrugation of the cladding tube the surface increased. The reduced wall thickness and effect the larger surface both improved values for the heat transfer and heat transfer.

Furthermore, can the flow of the heat transfer medium through the annular space between the cladding tube and the inner tube the corrugation of the cladding tube advantageously local microturbulence on the inner surface of the Form corrugated tube. These microturbulences favor heat transfer from the inner surface of the corrugated pipe into the heat transfer medium additionally.

Advantageously, the corrugated design of the cladding tube according to the invention allows it to be designed with sufficient bendability, so that it, together with the one which also has sufficient bendability. Inner tube can be rolled up. Overall, the line system can be rolled up for storage on the one hand and for its transport to the construction site to form a roll or a coil (ie several turns are formed). This enables the storage and transportation of the completed piping system. The assembly work and assembly time on site can be there through significantly reduced and the completion and testing of the piping system can take place in a specialist company in series production, whereby the quality assurance is also significantly improved.

Preferably is the cladding tube apart from one or more sections, their lengths are less than 2m, about its entire length designed as a corrugated tube.

On inventive concrete foundation element can be a prefabricated concrete body with at least one cavity open at the top, in which this is the cladding tube and the pipe system comprising the inner pipe is inserted, whereupon the space between the pipe system and the wall of the cavity with a volume stable and good thermal conductivity Poured pouring compound becomes. The pipe system can be inserted into the concrete body This is done after the concrete body has been driven into the ground is to damage to prevent the pipe system from being driven by the ram. In particular if it is not a concrete foundation element to be driven into the ground, but around an offset concrete foundation element acts, the pipe system can even before the concrete foundation element has been placed in the ground, used in the concrete body have been.

On inventive concrete foundation element can also be designed in such a way that the concrete body of the Concrete foundation element is formed by in-situ concrete in the the at least one cladding tube is poured. Here, the at least one cladding tube Reinforcing parts of the concrete body be attached.

The Terms "corrugated pipe", "corrugation" and "corrugated" are used in the present Registration used in a broad sense, such that everyone is longitudinal repetitive changes in diameter the cladding tube, where the period length is small compared to the length of the corrugated section of the cladding tube is to fall. In addition to sinusoidal or other arcuate Corrugations are, for example, trapezoidal, triangular or rectangular Curls included.

The Terms "top" and "bottom" refer to the installation position related to the energy absorber.

Further Advantages and details of the invention are described below the accompanying drawing explained. In this show:

1 a schematic longitudinal section of a concrete foundation element according to the invention;

2 a cross section through the concrete foundation element along the line A - A of 1 ;

3 a longitudinal section through an upper portion of a pipe system of a concrete foundation element according to the invention according to a further embodiment;

4 a view from above (viewing direction C in 3 );

5 a section along the line B - B of 3 ;

6 a longitudinal section through a lower end portion of a pipe system of a concrete foundation element according to a further embodiment of the invention; the 7 to 10 different possibilities for the corrugation of the cladding tube;

11 is a schematic representation of a further embodiment of the invention.

The Figures have different scales.

A first exemplary embodiment of a concrete foundation element according to the invention, which is designed here in the form of a foundation pile, is shown in FIGS 1 and 2 shown. The concrete foundation element has a concrete body 3 with an open, for example cylindrical cavity 2 , In this is a pipe system 1 arranged. The pipe system 1 includes a cladding tube 5 , which at its lower end by a closure part 8th is closed. Inside the cladding tube 5 extends an inner tube 15 to near the lower end of the cladding tube, the inner tube preferably ending at a distance of less than 1 m from the lower end of the cladding tube. Between the inner tube 15 and the cladding tube 5 there is an annulus 11 that just like the interior 12 of the inner tube 15 as a line for the line system 1 flowing heat transfer medium is used. The inner tube 15 is coaxial to the cladding tube with the exception of its uppermost section 5 , To define the position of the inner tube 15 in the cladding tube 5 serve spacers 13 ,

A top section of the cladding tube 5 is from a connector 6 formed, which has a gradation of its diameter in the embodiment shown, with a widened upper part results to have enough space for the connecting pipes 9 . 10 to accomplish. A lid or closure part 7 closes the connector at its upper end. Through a first opening in the closure part 7 this occurs to the supply of the heat transfer medium medium-serving connecting pipe 9 which in the annulus 11 empties. A second opening in the closure part 7 is from the connection pipe 10 interspersed, the interior of the interior 12 of the inner tube 15 continues and that serves to return the heat transfer medium. In the exemplary embodiment shown, the connecting pipe 10 from one of the closure part 7 protruding end portion of the inner tube 15 forming tube. So it's for the inner tube 15 and the connection pipe 10 a continuous tube is provided, its inside the cladding tube 5 lying part the inner tube 15 and its outside and above the cladding tube 5 lying part the connecting pipe 10 forms. During production, this continuous tube can be composed of several individual pieces which are connected, for example, by means of a weld.

The space between the pipe system 1 whose outer wall 22 from the outer surface of the cladding tube 5 is formed, and the wall of the cavity 2 is with a pouring compound 4 filled. The pouring compound should be volume-stable and good heat-conducting. For example, as a pouring compound 4 Bentonite, optionally with additives that can be formed, for example, by cement and / or quartz sand, etc., are used. A concrete-sand mixture with additives can also be used to achieve volume stability and to increase thermal conductivity. It would also be conceivable and possible as a pouring compound 4 Use sand alone. The term "pouring compound" is used in the context of this document not only for pourable compounds (although these are preferred), but also other substances which can be introduced into the intermediate space between the line system and the wall of the cavity, in particular free-flowing substances, are intended to be included.

The cladding tube 5 is formed over the majority of its longitudinal extent as a corrugated tube (corrugated hose). And that's over 1 apparent that the cladding tube 5 with the exception of the connector 6 forming section over its entire length is formed by a corrugated tube.

In an advantageous embodiment of the invention, the cladding tube consists at least in its corrugated area of plastic, for example polyethylene or polypropylene. The wall thickness of the cladding tube 5 its corrugated area is preferably at most 5 mm, a value of at most 3 mm being particularly preferred for corrugated pipes with diameters of at most 100 mm. It becomes a rollable design of the cladding tube 5 and subsequently the entire piping system 1 reached.

The connector 6 can also consist of plastic and with the corrugated part of the cladding tube 5 be connected by welding. Even the locking parts 7 and 8th can be made of plastic and the closure part 8th can with the lower end of the cladding tube 5 and the closure part 7 with the connector 6 of the cladding tube 5 be welded.

Especially in the case of the formation of the cladding tube 5 the inner tube is also made of plastic 15 made of plastic preferred. It can be the same plastic as for the cladding tube 5 be used. Since only significantly smaller loads act on the inner tube than on the cladding tube and the diameter of the inner tube is smaller, this can also be made correspondingly flexible without a corrugation, so that it can be rolled up.

In the upper section of the inner tube 15 this is preferably with thermal insulation 14 provided to prevent heat loss from inside the inner tube 15 to reduce flowing out heat transfer medium.

The pipe system 1 can be completed in a specialist company and delivered to the construction site in a state rolled up into a spool or reel. The pipeline system is then installed at the construction site 1 in the cavity 2 of the concrete body 3 , preferably after it has already been placed in the ground. After the introduction of the pipe system 1 in the cavity 2 of the concrete body 3 becomes the pouring mass 4 brought in. As a result, the connecting pipes 9 . 10 to the junction and connected.

It would also be conceivable and possible for the concrete foundation element with the piping system contained therein 1 prefabricated and delivered to the construction site in the finished state. This is especially the case when there are no special mechanical loads during installation on site.

Through the connection pipe 9 becomes the piping system 1 of the concrete foundation element heat transfer medium and this after heating for heating purposes or cooling for cooling purposes the connecting pipe 10 removed again.

When used for heating purposes, the heating system, which includes the concrete foundation element as an energy absorber, also has a heat pump. Due to the very good heat transfer of an energy absorber according to the invention, a small average temperature difference between the surrounding soil and the lei processing system 1 can be achieved. As a result, the heat transfer medium can have higher temperatures than conventional energy absorbers, so that even after passing through the heat pump it still has a temperature of significantly above 0 ° C, for example a temperature in the range between 2 ° C and 6 ° C. As a result, aggregate-free water, ie pure tap water, can be used as a heat transfer medium without the risk of frost. The use of antifreezes, as is conventionally required, can therefore be dispensed with.

In cooling mode, the heat transfer medium can either be removed from the pipe system 1 can be used for indirect room cooling by supplying it to a cooling unit. Since a comparatively low temperature of the heat transfer medium is reached after passing through the energy absorbers, direct cooling is also possible, for example via conventional ceiling, wall or floor heating systems.

The outer diameter d of the cladding tube 5 can be, for example, in the range between 5 and 20 cm. The diameter D of the cavity is equal to the diameter d of the cladding tube 5 adjusted and can for example be in the range between 7cm and 35cm, z. B. with an outer diameter of the cladding tube 5 of 8cm have a value in the range of 13cm. It is also conceivable and possible to use several pipe systems 1 in a cavity 2 of the concrete body 3 to arrange or in the concrete body 3 several cavities 2 to provide, in each of which one or more line systems 1 are arranged.

The 3 to 5 show a further embodiment for that in the concrete body 3 pipe system to be introduced 1 , There is also an expansion device to compensate for changes in volume of the heat transfer medium (in the exemplary embodiment according to FIGS 1 and 2 one is provided outside the concrete foundation element). For this purpose, two metal sleeves 16 in the annulus 11 inserted at its upper end by a wall 17 are closed and an opening at their lower end 18 exhibit. A spacer 19 gives a distance to the upper closure part 7 in front. When filling a heat transfer medium, it can be in the metal sleeves 16 initially no air from the metal sleeves 16 escape and forms a compressible air cushion. The metal construction ensures long-term airtightness. When executing the piping system 1 made of metal, the function of the expansion device can be achieved in that the connecting pipe 9 a little bit into the connector 6 protrudes and so in the connector 6 the air cushion is formed.

The section along the line D - D of 3 corresponds to that in 2 shown section along the line A - A of 1 ,

6 shows a variant in which the inner tube 15 to the lower end of the cladding tube 5 extends. The inner tube 15 has openings for it in its lower end region 21 for the passage of the heat transfer medium.

That in the 1 and 6 illustrated threaded hole 20 on the underside of the closure part 8th is used to screw in an additional weight to insert the cable system 1 in the cavity 2 to support when the dead weight of the pipe system 1 and the heat transfer medium filled therein is not sufficient for this purpose. Other types of attachment of additional weights are also conceivable and possible, such as, for example, external bores in the closure part 8th for attaching bolts or hooks, as well as ring-shaped holders, which are attached to the lowest part of the corrugated pipe.

To the energy absorber in the cavity 2 The cladding tube must be centered as much as possible or to avoid damage during insertion 5 on the outside preferably provided with spacers, not shown in the figures, which also have the function of guide and slide elements.

With the pipe system 1 is preferably a hose into the cavity 2 with introduced on the pipe system 1 can be attached outside and down to the bottom of the pipe system 1 extends. Through this the filler or the pouring compound 4 be filled in. It would also be conceivable and possible for this purpose to have another inside the cladding tube 5 running pipe to be provided, which through openings in the upper closure part 7 and in the lower closure part 8th occurs and at the bottom of the lower fastener 8th empties.

The 7 to 10 show examples of different training options for the corrugation of the cladding tube 5 , In addition to that from the 1 to 6 resulting sinusoidal corrugation are conceivable and possible, among other things, such as those in the 7 to 10 are shown. So shows 7 trapezoidal, 8th a rectangular and 9 a triangular or serrated curl. The curl of 10 is formed by successive semicircular sections that are connected by straight sections.

The Height h the corrugation (between wave crest and wave valley) is advantageously at least 2 mm. A value is in the range between 3 mm and 5 mm particularly preferred.

Also a training of the cladding tube 5 made of metal, for example stainless steel, is conceivable and possible. In this case, a wall thickness of the cladding tube of at most 3 mm is preferred in order to make the corrugated cladding tube and subsequently the entire line system rollable, with a wall thickness of at most 2 mm being preferred for corrugated tubes with a diameter of at most 100 mm. Even the inner tube 15 can be made of metal in this case. An education of the cladding tube 5 and if necessary the inner tube 15 Made of metal is particularly preferred when using a heat transfer medium that changes its state of matter in the system cycle between liquid and gaseous. Such a heat transfer medium can be formed, for example, by a corresponding excess pressure (for example in the range of 40 bar) of carbon dioxide or hydrocarbon. Higher working temperatures are also possible with a training made of metal.

It would also be conceivable and possible for the inner tube 15 likewise at least over a large part of its longitudinal extension as a corrugated tube, for example in the region of its longitudinal extension in which it is within the section of the cladding tube designed as a corrugated tube 5 runs.

The concrete body 3 Instead of training in the form of a prefabricated part, which is transported to the construction site in the finished state, could also be formed by in-situ concrete. Such an embodiment of the invention is shown schematically in 11 shown. To manufacture the concrete foundation element is in the ground 23 first a recess 24 with an appropriate shape and depth. Reinforcement parts are in these 25 introduced, in particular a corresponding reinforcement cage. Furthermore, at least one pipe system 1 into the recess 24 introduced, which is designed in the manner described above and a cladding tube 5 and one inside the cladding tube 5 running inner tube 15 has, the outer wall 22 of the pipe system from the outer surface of the cladding tube 5 is formed. The line system is preferably 1 , for example with plastic quick ties or with a binding wire 26 , attached to the reinforcement cage. As a result, the recess 24 poured with concrete, creating the concrete body 27 is formed. The at least one pipe system 1 is thus in the concrete body 27 cast. Also several pipe systems 1 could in this way in the concrete body 27 be poured in.

A building based on the concrete foundation element 28 is in 11 only indicated schematically.

For example can the concrete foundation element according to the invention, which has been made in this way from in-situ concrete, a Diaphragm wall or a bored pile. Others in the manner according to the invention trained concrete foundation elements of buildings can also consist of in-situ concrete.

If necessary, into the recess 24 Formwork to be used is in 11 not shown and can be formed in the usual way.

different Modifications of the illustrated embodiments of the invention are conceivable and possible without leaving the scope of the invention.

1

line system

2

cavity

3

concrete body

4

Ausgussmasse

5

cladding tube

6

connector

7

closing part

8th

closing part

9

connecting pipe

10

connecting pipe

11

annulus

12

inner space

13

spacer

14

thermal insulation

15

inner tube

16

metal sleeve

17

wall

18

opening

19

spacer

20

threaded hole

21

opening

22

outer wall

23

soil

24

recess

25

reinforcing part

25

binding wire

27

concrete body

28

building

Claims (27)

Concrete foundation element of a building, whereby to form the concrete foundation element as an energy absorber, a cladding tube ( 5 ) in a concrete body ( 3 . 27 ) of the concrete foundation element is arranged and within the cladding tube ( 5 ) an inner tube ( 15 ) runs with the annulus ( 11 ) between the cladding tube ( 5 ) and the inner tube ( 15 ) and the interior ( 12 ) of the inner tube ( 15 ) Form lines for a heat transfer medium, characterized in that the cladding tube ( 5 ) at least one Part of its longitudinal extent, preferably over a large part of its longitudinal extent, is designed as a corrugated tube. Concrete foundation element according to claim 1, characterized in that the cladding tube ( 5 ) with the inner tube arranged in it ( 15 ) for storage and transport before it is placed in the concrete body ( 3 . 27 ) of the concrete foundation element can be rolled up into a roll. Concrete foundation element according to claim 1 or claim 2, characterized in that the cladding tube ( 5 ) consists of plastic at least in its corrugated area, preferably over its entire length. Concrete foundation element according to claim 3, characterized in that the wall thickness of the cladding tube ( 5 ) in its corrugated area is at most 5 mm and, if the corrugated area is formed with an outer diameter of at most 100 mm, is preferably at most 3 mm. Concrete foundation element according to one of claims 3 or 4, characterized in that the inner tube ( 15 ) is made of plastic. Concrete foundation element according to claim 1 or claim 2, characterized in that the cladding tube ( 5 ) consists of metal at least in its corrugated area, preferably over its entire length. Concrete foundation element according to claim 6, characterized in that the wall thickness of the cladding tube ( 5 ) in its corrugated area is at most 3 mm and, if the corrugated area is formed with an outer diameter of at most 100 mm, is preferably at most 2 mm. Concrete foundation element according to claim 6 or claim 7, characterized in that the inner tube ( 15 ) is made of metal. Concrete foundation element according to one of claims 1 to 8, characterized in that the corrugations of the cladding tube sinusoidal, trapezoidal, rectangular, triangular or in the form of successive semicircles or in the form of a combination of which are trained. Concrete foundation element according to one of claims 1-9, characterized characterized that the height (h) of the corrugations is at least 2 mm, with a value in the range between 3 mm and 5 mm is particularly preferred. Concrete foundation element according to one of claims 1 to 10, characterized in that the inner tube ( 15 ) at least over an upper section of its longitudinal extent with thermal insulation ( 14 ) is provided. Concrete foundation element according to one of claims 1 to 11, characterized in that the inner tube ( 15 ) at a distance of less than 1 m from the lower end of the cladding tube ( 5 ) ends. Concrete foundation element according to one of claims 1 to 12, characterized in that in the annular space ( 11 ) an expansion device to compensate for changes in volume of the heat transfer medium is arranged. Concrete foundation element according to claim 13, characterized in that the stretching device has at least one metal sleeve which is open at the bottom and closed at the top ( 16 ) having. Concrete foundation element according to one of claims 1 to 14, characterized in that a connecting pipe ( 9 ) by an upper closure part ( 7 ) of the cladding tube ( 5 ) in the annulus ( 11 ) is performed. Concrete foundation element according to one of claims 1 to 15, characterized in that a connecting pipe ( 10 ) by an upper closure part ( 7 ) of the cladding tube ( 5 ) is guided, the interior of the connecting pipe ( 10 ) from the interior ( 12 ) of the inner tube ( 15 ) is continued. Concrete foundation element according to claim 16, characterized in that the connecting pipe ( 10 ) from one of the upper closure part ( 7 ) of the cladding tube ( 5 ) protruding end section of the inner tube ( 15 ) forming tube is formed. Concrete foundation element according to one of claims 1 to 17, characterized in that the outer diameter (d) of the cladding tube in the corrugated part of the cladding tube ( 5 ) is between 5 cm and 20 cm. Concrete foundation element according to one of claims 1 to 18, characterized in that the cladding tube ( 5 ) apart from one or more sections, the lengths of which are less than 2 m, is formed over its entire length as a corrugated tube. Concrete foundation element according to one of claims 1 to 19, characterized in that the cladding tube ( 5 ) is closed at its lower end. Concrete foundation element according to one of the Claims 1 to 20, characterized in that the concrete foundation element is a foundation pile. Concrete foundation element according to one of claims 1 to 21, characterized in that the concrete foundation element is a prefabricated concrete body ( 3 ) with at least one cavity ( 2 ) in which the at least one cladding tube ( 5 ) is arranged. Concrete foundation element according to claim 22, characterized in that the cavity ( 2 ) of the concrete body ( 3 ) is open at the top. Concrete foundation element according to claim 22 or claim 23, characterized in that between the concrete body ( 3 ) and the at least one cladding tube ( 5 ) a pouring compound ( 4 ) is introduced. Concrete foundation element according to one of claims 22 to 24, characterized in that the concrete body ( 3 ) Contains steel reinforcement parts. Concrete foundation element according to one of claims 1 to 21, characterized in that a concrete body ( 27 ) of the concrete foundation element is formed by in-situ concrete and in this concrete body ( 27 ) the at least one cladding tube ( 5 ) is cast in. Concrete foundation element according to claim 26, characterized in that the at least one cladding tube ( 5 ) on reinforcement parts ( 25 ) of the concrete body ( 27 ) is attached.