AT523605A1 - Thermally insulating civil engineering structure and process for its manufacture - Google Patents

Abstract

A method and civil engineering structure for forming an at least partially underground barrier, comprising a heat-insulating insulating wall (1), the insulating wall (1) comprising bored pile bores filled with heat-insulating material (2).

Description

Thermally insulating civil engineering structure and process for its manufacture

The invention relates to an underground structure and to a method for producing an underground structure according to the preambles of the independent claims.

Various possibilities for forming a barrier running underground are known from the prior art. In particular, sheet pile walls, diaphragm walls and bored pile walls are known from special civil engineering.

A well-known problem with barriers of this type are groundwater-conducting layers with a high level of water permeability, since in these layers, due to the high level of permeability, there are usually strong movements of the groundwater.

In order to hold off the groundwater, it is known to guide conventional civil engineering wall constructions through the aquifer-conducting layers to an underlying aquifer. An aquifer is an underlying layer, the permeability of which is many times smaller than the permeability of the aquifer.

A continuous barrier that extends from the top of the ground or from the groundwater table to a groundwater reservoir can be used to keep or prevent the water flowing in the aquifer.

distract.

A problem that has received little attention so far arises from the fact that the water flowing in the groundwater-conducting layer continuously and in large quantities dissipates heat energy from the underground structure. There is underground thermal insulation for cellar walls, for example. The basement wall is exposed and covered with foam. However, this type of thermal insulation is generally not suitable for greater depths, as are often necessary to bridge the aquifer, especially for depths of more than 10 m.

The object of the invention is now to overcome the disadvantages of the prior art and, in particular, to create a civil engineering structure that is thermally insulating down to great depths, in particular even in layers that are highly conductive to the groundwater

is trained.

The object according to the invention is achieved in particular by the features of the independent patent claims.

The invention particularly relates to a civil engineering structure for forming an underground

running barrier with a heat-insulating insulating wall.

It is preferably provided that the wall comprises bored pile bores filled with thermal insulation material.

If necessary, it is provided that the insulating wall is designed as a bored pile wall made of a thermal insulation material. In all embodiments, this can mean in particular that the insulating wall is designed as bored pile bores filled with thermal insulation material. The thermal insulation material of the insulating wall can, for example, be loose granules such as foam glass gravel, at least partially a binder

bonded thermal insulation material, such as foam glass gravel, or a dimensionally stable thermal insulation material, such as bonded foam glass gravel.

If necessary, it is provided that the thermal insulation material has a thermal conductivity of A <0.5 W / (m * K), in particular) <0.1 W / (m * K).

If necessary, it is provided that the thermal insulation material is or comprises foam glass gravel. If necessary, it is provided that the thermal insulation material comprises a binding agent. If necessary, it is provided that the thermal insulation material is at least partially bound by a binder or comprises a binder.

If necessary, it is provided that the insulating wall is designed as a continuous, overlapping bored pile wall. If necessary, it is provided that the

Insulation wall is composed of primary piles and secondary piles.

If necessary, the underground structure comprises a sealing wall acting as a water barrier, the sealing wall being designed to follow the course of the insulating wall.

If necessary, it is provided that the cut-off wall extends from the local groundwater reservoir layer to above the groundwater level and preferably to the top of the terrain.

If necessary, it is provided that a dewatering device for dewatering is provided in the area between the sealing wall and the insulating wall, the dewatering device in particular having one or more wells

includes.

If necessary, the underground structure comprises a partition wall, the partition wall following the course of the insulating wall and between the insulating wall and a partition to be separated

Space is arranged.

If necessary, it is provided that the insulating wall is arranged between the partition wall and the sealing wall.

If necessary, it is provided that the sealing wall, the Danish wall and the partition wall surround the space to be separated in a closed manner, that is to say in particular along a closed contour, and / or surround it along a closed contour. This closed contour corresponds to the contour along which the walls

viewed from above, in order to delimit the separated space laterally.

If necessary, it is provided that the separated space is set up to store a heat transfer medium, such as hot water, and that the underground structure is designed as a large heat store and, in particular, as a hot water store. Alternatively, the separated room can also be used to store cold.

In particular, the invention relates to a method for forming a civil engineering structure, which is preferably designed according to the invention and which comprises the following steps: creating a plurality of bores, in particular a plurality of bored pile bores; Filling the holes, in particular the bored pile holes, with a thermal insulation material,

so that a heat-insulating insulating wall is formed.

If necessary, it is provided that primary bores are first made, which are filled or filled with the thermal insulation material to form primary piles, and then secondary bores are made, which are filled or filled with the thermal insulation material to form secondary piles, the secondary bores preferably overlapping with the primary bores arranged

will.

If necessary, it is provided that, in particular before the formation of the insulating wall, a sealing wall acting as a water barrier is formed, wherein the sealing wall is formed following the course of the possibly later created insulation wall.

If necessary, it is provided that a dewatering device for dewatering is provided in the area between the sealing wall and the insulating wall, the dewatering device in particular having one or more wells

includes.

If necessary, it is provided that a partition is formed, the partition following the course of the insulating wall in one possible embodiment and

is arranged between the insulating wall and a room to be separated.

If necessary, it can be provided in a possible embodiment that the insulating wall is arranged between the sealing wall and the partition wall, the

Insulating wall is optionally formed before the partition wall.

In a preferred embodiment of the invention, the known technology for producing an overlapping bored pile wall is modified in such a way that, in contrast to the prior art, the basic material of the bored pile wall is not sufficient

Concrete, but is formed from a thermal insulation material.

While the bored pile technology according to the state of the art is used to form walls, such as construction pit enclosures, for particularly great depths or for particularly heavy loads, the technology is modified according to the invention so that it is primarily used to form deep thermal insulation, which is preferred none or only one

insignificant load bearing effect.

Rather, it can be provided in a possible embodiment that at least one further wall is provided in a civil engineering structure according to the invention, which is designed to follow the insulating wall and which takes over the mechanical support.

Two walls are preferably provided which follow the insulating wall on both sides, so that the insulating wall is arranged between the two walls. As a result, the insulating wall can be protected from both sides against environmental influences, such as the effects of forces, water ingress, etc.

The underground structure, in particular the insulating wall, preferably extends from the top of the terrain to the groundwater storage layer below. In principle, however, the civil engineering structure according to the invention can be used in all areas and substrates

that are suitable for the application of the bored pile technology.

The underground structure can be used in particular for insulation and / or formation of a barrier,

a retaining wall and / or a basin can be used.

One possible application is the formation of a thermally insulated large heat storage tank, in particular a thermally insulated large hot water storage tank. In such an embodiment, the underground structure can extend closed, that is to say in particular along a closed contour, around a space to be separated, in which a heat storage medium such as

especially hot water is provided.

The underground structure preferably extends vertically or at an angle into the ground. The lower end of the separated space can be formed, for example, by the groundwater storage layer. Alternatively, a base plate can be formed. If necessary, an additional seal, such as a potting compound or a film, can be used to seal the separated space.

can be used.

The underground structure and the method are suitable and / or set up for this purpose, insulating walls with a depth of over 10 m, in particular over 20 m and preferably up to

to 50 m to build.

In an exemplary embodiment, the insulating wall can be erected up to 30 m deep. The partition can in the exemplary embodiment up to

50m deep.

The thermal insulation material can be or comprise, for example, foam glass gravel, expanded glass granules or expanded perlite. The following materials can be named as possible insulation materials:

- Technopor foam glass gravel, density 170 kg / m®, A = 0.08 W / mK, pressure resistance 5 bar

- Expanded glass granulate, density 190 kg / m®, A = 0.07 W / mK,

- ecoglas foam glass gravel, density 160 kg / m®, A = 0.08 W / mK, pressure resistance 2.7 bar

- GEOCELL foam gravel, density 140 kg / m®, \ = 0.08 W / mK, compressive strength 2.8 bar - Glass foam gravel veriso, density 150 kg / m®, \ = 0.08 W / mK, compressive strength 2.7 bar - Perlite, density 1,000 kg / m®,

- Expanded perlite (silicone-impregnated), density 100 kg / m®, \ = 0.06 W / mK, pressure resistance 2 bar.

The sealing wall can be a conventional wall suitable for sealing against flowing groundwater, such as in particular a narrow wall or a single-phase sealing slotted wall. Alternatively, but less preferred, a mixed

in-place wall, a DSV lamella wall or a sheet pile wall can be used.

The water retention device preferably acts in all embodiments in the area of the insulating wall and therefore in particular between the sealing wall and the partition wall.

The partition wall can be a conventional wall suitable for separating a room or a pit, which preferably also has a load-bearing or supporting function. For example, the partition wall can be a conventional diaphragm wall. Alternatively, the partition wall can be a sealed embankment. The partition wall preferably extends from the upper edge of the terrain or from a higher area

at least as far as the aquifer.

If necessary, the partition wall can also extend into deeper areas, that is to say beyond the boundary of the groundwater reservoir layer, further into the ground. In the area of the groundwater storage layer, a wall is usually not necessary, as there is almost no water movement in this layer and therefore the

Heat transport is comparatively low. In particular with hot water storage tanks, there is also the effect that the water in

has a lower temperature than in higher areas,

which means in deeper areas, especially in the area of the

Groundwater retention layer, the temperature gradient between hot water and the surrounding soil is smaller, which also reduces the heat flow.

The invention is further described below with reference to the figures, wherein: FIG. 1 shows a schematic sectional illustration, the sectional plane of which runs essentially vertically, and FIG

FIG. 2 shows a schematic sectional illustration, the sectional plane of which is essentially

runs horizontally.

Unless otherwise stated, the reference symbols correspond to the following components: insulating wall 1, thermal insulation material 2, primary pile 3, secondary pile 4, cut-off wall 6, groundwater retention layer 7, groundwater level 8, ground level 9, water retention device 10, well 11, partition wall 12, room 13 to be separated off, hot water 14, insulation fill 15.

1 shows a schematic sectional illustration of a possible embodiment of a civil engineering structure for forming an at least partially underground structure

Barrier with an insulating wall 1.

In the present embodiment, the insulating wall 1 runs from the top edge 9 of the ground up to or into the groundwater reservoir layer 7. Between the top edge 9 of the ground and the groundwater reservoir layer 7 there is a groundwater-conducting layer which has a higher water permeability than the groundwater reservoir layer 7. Above the top groundwater 9 can in all

Embodiments an insulating fill 15 can be provided. The groundwater level 8 can fluctuate over time. The groundwater in the aquifer is possibly flowing water or stronger

Subject to water movements.

The insulating wall 1 is formed from a thermal insulation material 2. The thermal insulation material 2

can for example be foam glass gravel and optionally with a

Binders are bound. If necessary, the thermal insulation material 2 of the insulating wall 1 is bound in sections by a binding agent.

Since the thermal insulation material 2 of the insulating wall 1 may have a porous structure, it may be necessary to provide a sealing wall 6 or to store it in front of it in order to prevent water entering from impairing the insulating effect of the insulating wall 1. The sealing wall 6 can be designed as a water-impermeable wall, such as a narrow wall, for example. The sealing wall 6 is set up in particular to keep or divert the groundwater so that the groundwater does not enter the area of the insulating wall 1 or only to a small extent

can advance.

As an additional measure to improve the effectiveness of the insulating wall 1, a dewatering device 10 is provided in the present embodiment, which in particular comprises several wells 11. Groundwater collects in the well 11, which can then be transported away by pumps.

As a result, the area of the insulating wall 1 can be kept largely dry.

The underground structure preferably comprises a partition wall 12. This partition wall 12 is designed in particular to separate a space 13. This space 13 can, for example, be a space for storing hot water 14 or an excavation pit

or an underground room.

In the present embodiment, a heat storage medium such as hot water 14 is provided in the separated space 13. The partition wall 12 can be designed, for example, as a slit wall. The partition wall 12 comes in this

Embodiment to have a supporting effect. Above the top edge 9 of the terrain, in particular above the insulating wall 1 and the

Sealing wall 6, a bed of embankments can be arranged. The partition wall 12 extends

preferably over the top edge 9 away in the height.

FIG. 2 shows a sectional illustration of an underground structure, in particular the underground structure from FIG. 1, the sectional plane being an essentially horizontal one

Cutting plane is.

The underground structure comprises an insulating wall 1, which is formed as a bored pile wall, in particular as an overlapping bored pile wall, from a thermal insulation material 2.

The overlapping of the bored piles enables the formation of a continuous insulating wall 1, which has constrictions in sections, with the smallest thickness

is dimensioned for adequate thermal insulation.

In particular, the insulating wall 1 has primary piles 3 and secondary piles 4. The primary piles 3 are preferably filled with a thermal insulation material 2 which is bound by a binding agent. According to a preferred embodiment, the secondary piles 4 can be filled with a thermal insulation material 2 without a binder. Alternatively, however, a bonded thermal insulation material 2 can also be provided in the secondary piles 4.

Following the course of the insulating wall 1, a sealing wall 6 is provided in the present embodiment. A water holding device 10, in particular a well 11, is arranged between the sealing wall 6 and the insulating wall 1. In the present embodiment, the partition wall 12 is provided on the other side of the insulating wall 1. This runs along the wall 1 and forms a separate space 13 which, in this embodiment, is filled with hot water 14.

The following procedure can be used to produce an underground structure, in particular an underground structure according to FIGS. 1 and / or 2.

In a first step, a sealing wall 6 is preferably formed through the water-conducting layer up to the groundwater retention layer 7. The sealing wall 6 runs along any contour, in particular in a straight line in sections. To form a basin, the underground structure preferably runs along a closed contour. In this embodiment, the sealing wall 6 can also be formed along a closed contour.

In a later step, the insulating wall 1 can be formed. For this purpose, primary bores are first created at a certain distance from one another, which are filled with thermal insulation material 2 in order to form primary piles 3. The distance between the primary piles 3 is smaller than the diameter of the subsequently created secondary piles 4. To form the secondary piles 4, secondary bores are arranged in such a way that they overlap with the primary piles 3. By filling the secondary bores with thermal insulation material 2, secondary piles 4 are formed which overlap with the primary piles 3

exhibit.

Before the insulating wall 1 is formed, a dewatering device 10, such as a well 11 in particular, can be built through which the groundwater is transported away

can be.

The partition wall 12 is preferably formed before the insulating wall 1 is constructed, but in particular after the sealing wall 6 has been constructed. The partition wall 12 can be designed, for example, as a slotted wall. The partition wall 12 separates the space 13 to be separated. This space 13 can optionally be excavated, so that the underground structure is designed as a basin sheeting or pit sheeting. In the embodiment of a large heat accumulator, the excavated space 13 can optionally be further sealed and subsequently filled with hot water 14.

The primary piles 3 are preferably filled and formed by a thermal insulation material 2 bound with a binding agent, such as bound foam glass gravel. The binding with a binding agent prevents the thermal insulation material 2 of the primary piles 3 from escaping into the secondary bores when the secondary bores are being made. The secondary piles 4 can be filled with an unbound thermal insulation material 2, for example with foam glass gravel.

In all embodiments, the sealing wall 6, the insulating wall 1 and the partition wall 12 run at least partially, preferably completely, underground. In particular, the walls are constructed as subterranean walls, in particular the partition 12 being exposed by later excavation of the space 13 and thus only touching the ground on one side.

Claims (1)

Claims 1. Underground structure to form an at least partially underground barrier, comprising a heat-insulating insulating wall (1), characterized in that the insulating wall (1) comprises bored pile bores filled with heat-insulating material (2). 2. Underground structure according to claim 1, characterized in that the insulating wall (1) is designed as a bored pile wall made of a thermal insulation material (2). 3. Civil engineering structure according to claim 1 or 2, characterized in that - that the thermal insulation material (2) has a thermal conductivity of \ <0.5 W / (m * K), in particular) \ <0.1 W / (m * K), - and / or that the thermal insulation material (2) is or comprises foam glass gravel, - and / or that the thermal insulation material (2) is at least partially loose foam glass gravel, - and / or that the thermal insulation material (2) is at least partially bound by a binding agent or comprises a binder. 4. Civil engineering structure according to one of claims 1 to 3, characterized in that - that the insulating wall (1) is designed as a continuous, overlapping bored pile wall, - and / or that the insulating wall (1) consists of primary piles (3) and secondary piles (4) is composed. 5. Civil engineering according to one of claims 1 to 4, comprising a sealing wall (6) acting as a water barrier, wherein the sealing wall (6) is formed following the course of the insulating wall (1). 6. Civil engineering works according to claim 5, characterized in that the sealing wall (6) extends from the local groundwater reservoir layer (7) to above the groundwater table (8) and preferably to the top of the ground (9). 11. 12th 13th 14 58914 / GP Underground structure according to claim 5 or 6, characterized in that a water retention device (10) for water retention is provided in the area between the sealing wall (6) and the insulating wall (1), the water retention device (10) in particular having one or more wells (11). includes. Civil engineering according to one of the preceding claims, comprising a partition (12), wherein the partition (12) follows the course of the insulating wall (1) and is arranged between the insulating wall (1) and a space (13) to be separated and wherein the partition is in particular a Diaphragm wall or a sealed embankment is. Civil engineering structure according to Claim 8, characterized in that the insulating wall (1) is arranged between the partition wall (12) and the sealing wall (6). Underground structure according to claim 8 or 9, characterized in that the sealing wall (6), the insulating wall (1) and the partition wall (12) close the space (13) to be separated, i.e. in particular along a closed contour, surround. Underground structure according to one of claims 8 to 10, characterized in that the separated space (13) is set up to store a heat transfer medium, such as water or hot water (14), and that the underground structure is designed as a large heat store and in particular as a hot water store. A method for forming a civil engineering structure, which is designed in particular according to one of the preceding claims, comprising the following steps: - creating several bored pile holes, - Filling the bored pile holes with a thermal insulation material (2) so that a insulating insulating wall (1) is formed. Method according to claim 12, characterized in that - that the thermal insulation material (2) has a thermal conductivity of \ <0.5 W / (m * K), in particular \ <0.1 W / (m * K), 15th 16. 17th 18th 15 58914 / GP - and / or that the thermal insulation material (2) is or comprises foam glass gravel, - and / or that the thermal insulation material (2) is at least partially loose foam glass gravel, - and / or that the thermal insulation material (2) is at least partially bound by a binder or comprises a binder. Method according to claim 12 or 13, characterized in that when creating the bores: - First primary bores are made, which are filled with the thermal insulation material (2) to form primary piles (3), - and then secondary bores are made which are filled with the thermal insulation material (2) to form secondary piles (4), the secondary bores being arranged so as to overlap the primary bores will. Method according to one of Claims 12 to 14, characterized in that, in particular before the insulating wall (1) is formed, a sealing wall (6) acting as a water barrier is formed, the sealing wall (6) following the course of the insulating wall (1) that may be created later ) is trained as follows. Method according to Claim 15, characterized in that the sealing wall (6) extends from the local groundwater storage layer (7) to above the groundwater table (8) and preferably to the top edge (9) of the ground. Method according to claim 15 or 16, characterized in that a water retention device (10) for water retention is provided in the area between the sealing wall (6) and the insulating wall (1), the water retention device (10) in particular having one or more wells (11) includes. The method according to any one of claims 12 to 17, characterized in that a partition (12) is formed, the partition (12) following the course of the insulating wall (1) and between the insulating wall (1) and a 20th 21. 16 58914 / GP to be separated space (13) is arranged and wherein the partition wall is in particular a diaphragm wall or a sealed embankment. Method according to claim 18, characterized in that the insulating wall (1) is arranged between the sealing wall (6) and the partition (12), the insulating wall (1) being formed in front of the partition (12) if necessary. Method according to claim 18 or 19, characterized in that the sealing wall (6), the insulating wall (1) and the partition wall (12) are designed in such a way that they close the space (13) to be separated, i.e. in particular along a closed contour. Method according to one of Claims 18 to 20, characterized in that the separated space (13) is set up to store hot water (14), and that the underground structure is designed as a large heat store and in particular as a hot water store.