DE102015110911A1 - Method for the subsequent securing of insufficiently anchored facing shells of a double-shell masonry - Google Patents

Abstract

Method for the subsequent anchoring of two wall shells (12, 13) of an at least two-shell wall construction (1) of an existing building (100) and for securing insufficiently anchored or endangered facing shells (3), wherein a wall shell (13) as an outer shell (3) and the another wall shell (12) serves as an inner shell (2). It is in a cavity (4) between the existing outer shell (3) and the existing inner shell (2) an outer shell (3) and the inner shell (2) permanently interconnected plastic material (10) introduced to a static secondary anchoring of the outer shell ( 3) on the inner shell (2) to achieve.

Description

The present invention relates to a method for the subsequent anchoring of two wall shells of an at least two-shell wall construction of an existing building and in particular for securing insufficiently anchored or endangered facing shells. In particular, the method is provided for anchoring a facing brick in existing buildings. Through the process, facing masonry shells can be statically secured, so that, for example, due to the effects of the weather, endangered and pre-walled wall shells made, for example, of bricks or other materials, can be sufficiently statically secured.

In the prior art, various methods and systems have become known in order to subsequently secure a pre-walled facing brick in such two-shell masonry. For example, if the mortar has partially dissolved in the outer facing wall due to weather or the ingredients serving for consolidation (masonry mortar) were washed out by driving rain or other external influences, so that of the original mortar to a high proportion only sand in the joints between the individual bricks remain and / or the originally installed wire anchors (air layer anchor) are due to age-related corrosion or triggering from the anchor doubt the stability of the construction.

In such walls or facades, the stability is no longer guaranteed permanently. This can lead to considerable material or health damage.

For the subsequent protection of such endangered roughing shells dowel systems are usually used in which, for example, in the fugue of the facing wall holes are introduced, which extend into the second wall shell. Subsequently, a dowel is used and it is an injection anchor and / or crack formation also introduced a spiral anchor to secure the facing brick static on the other wall shell. Before installing the anchor, the masonry joint is regularly cleared and after setting the anchor, the joint network is renewed, so that the facing wall is kept stable.

After the renovation, a stable double-shell masonry is available. A disadvantage of this known method is the high financial and material costs for remediation, since a large number of boreholes must be introduced, in each of which an anchoring element is inserted and anchored there with both masonries. In addition, the Arbeien are very invasive, take a long time and represent a significant noise pollution for residents and residents.

It is therefore an object of the present invention to provide a method for the subsequent securing of a facing brick of a clam shell masonry available, with a lower cost, a reliable backup of a facing brick is achieved.

This object is achieved by a method having the features of claim 1 and by the use claim having the features of claim 17. Preferred developments of the invention are subject of the dependent claims. Further advantages and features of the present invention will become apparent from the general description and the description of the embodiment.

The inventive method is used for the subsequent anchoring of two wall shells of an at least two-shell wall construction of an existing building and in particular for securing insufficiently anchored or endangered front wall shells. In this case, a wall shell is the outer shell and the other wall shell is the inner shell or serves as an inner shell. In a cavity between the existing outer shell and the existing inner shell of the outer shell and the inner shell permanently interconnecting plastic material is introduced according to the inventive method to achieve a static secondary anchoring of the outer shell to the inner shell.

The method according to the invention has many advantages. A significant advantage of the method according to the invention is that at least one plastic material is introduced into the cavity between the outer shell and the inner shell, which connects the two wall shells together. It is not necessary to provide elaborate dowel designs and to secure the outer wall shell to the inner wall shell. The introduced plastic material is sufficient without additional mechanical fasteners to firmly and permanently anchor the outer shell to the inner shell.

In particular, the plastic material adheres over its entire surface to the inner shell and to the outer shell. This means that the plastic material fully adheres to the inner shell and also adheres to the entire surface of the outer shell. As a result, a firm connection is achieved by the outer shell with the inner shell. In particular, the inner shell is the inner wall and the outer shell is the outer wall.

For the purposes of the present application, the term "full-surface area" is understood to mean an essentially full-surface adhesion, ie at least 60% and in particular at least 75% of the wall surface are completely bonded to the plastic material. The large adhesive surface provides high strength of the joint, providing more than sufficient bond strength between the outer shell and the inner shell, and achieves strength even after a variety of temperature changes and / or frost effects to attach the outer wall or front wall shell to the inner wall.

In preferred developments, the plastic is at least substantially formed by a plastic foam whose starting materials are supplied to the cavity. Such a method is particularly advantageous because the plastic material is formed by a plastic foam, which is formed in the cavity. As a result, the required starting materials can be supplied to the cavity in a simple manner. A chemical reaction between the individual starting materials leads to foaming, so that the material foams and rises in the cavity and thus bonded over the entire surface with the adjacent walls of the clam shell wall construction.

In all embodiments, it is particularly preferred that the plastic foam is at least partially and in particular almost completely or completely formed by at least one polyurethane. Particularly preferably, the plastic foam is formed by polyurethane with a substantially closed cell structure or consists thereof. Such a plastic foam with a closed cell structure offers, inter alia, the advantage that the plastic foam is substantially waterproof, so that a moisture transmission in the form of water is at least substantially excluded.

Particular preference is given to using fluids as starting materials. At least one polyol and at least one di- or polyisocyanate are particularly preferably used. Pentafluorobutane (R365mfc or 1,1,1,3,3-pentafluorobutane) and / or heptafluorobutane (R227ea or 1,1,1,2,3,3,3-heptafluoropropane) is particularly preferably simultaneously introduced into the cavity as blowing agent. It is possible that the propellant or the blowing agent is already present in the fluids, which are mixed for example in a mixing chamber and then introduced into the cavity. But it is also possible that the blowing agent or the blowing agent are introduced separately into the cavity or into the mixing chamber. In any case, at least one polyol and at least one di- or polyisocyanate and at least one blowing agent are introduced into the cavity. The mixture reacts in the cavity and foams out to the plastic foam. During foaming, the plastic foam rises and completely fills the cavity between the outer shell and the inner shell.

In the cavity, the essential starting materials of the plastic foam are preferably introduced in liquid form.

The starting materials react with each other. Polyurethane is formed in the polyaddition between at least one polyol, ie an alcohol compound having a plurality of hydroxyl groups per molecule and at least one di- or polyisocyanate. The polyaddition reaction is exothermic and releases heat. The polyaddition reaction can be selectively influenced with various polyol or isocyanate components and also by the addition of blowing agents or other additives.

More preferably, after curing, the plastic foam shrinks by less than 3 percent by volume, and more preferably by less than 1 percent by volume, and preferably by 0.5 percent or less. This ensures that a full-surface bonding with the inner shell and the outer shell is maintained. In the method according to the invention, the very low shrinkage of the plastic foam during and after curing means that a complete and permanent connection of the inner wall to the outer wall can be ensured.

Particularly preferably, a plurality of bores is bored through at least one wall shell of the wall construction prior to introduction of the plastic material or its components. Through the plurality of holes, the starting materials for the plastic foam can be introduced. The distances of the holes in the horizontal and / or vertical direction are variable and depend on the circumstances. In particular, the vertical and horizontal distances also depend on the width or the depth of the cavity. Thus, a larger number of holes is regularly introduced at a smaller width of the cavity (distance between the inner wall of the outer wall) than with a larger width of the cavity.

Preferably, the holes are introduced in particular horizontally in the foot of the cross joint in the wall shell of the wall construction, but may also be arranged (slightly) inclined. Preferably, after the introduction of the holes these first with Closing elements closed. Particularly preferably, the closure elements have a conical portion which is introduced into the bore to allow a tight closure of the bore. Particularly preferably, the corresponding bore is closed directly after insertion of a bore with a closure element. This ensures that all access holes are closed at the start of foaming or introduction of the precursors, so that the fluids introduced into the cavity do not accidentally leak out of a bore.

Particularly preferably, collecting containers are arranged or fastened at least partially below the bores on an outer side of the wall shell provided with bores. Such a collecting container serves to catch any emerging material from the bore, so that contamination of the outside of the facade is reliably prevented. In this case, the collecting container can be arranged only below the holes. But it is also possible that the collecting container is mounted with a wall on the outer facade and extends this wall to above the borehole. At the hole, the corresponding wall of the collecting container can be provided with a passage hole, so that there for filling a nozzle can be inserted there and any leaking material through the opening and can be absorbed in the receptacle.

The collecting container may in particular be designed as a collecting funnel and, for example, have a semicircular shape. Collecting containers can be formed in simple cases as a bag, which can optionally be used multiple times.

Particularly preferred are before the introduction of the plastic material, the cavity bounding walls of the outer shell and the inner shell by blowing or washing or the like freed from dust. These hoses can be introduced through the holes in the outer shell, which are acted upon with compressed air or water to rid the surfaces of the cavity bounding walls of the outer shell and the inner shell of adhering dust, dirt, etc. As a result, the adhesive effect of the plastic foam is reinforced, so that a sufficiently secure attachment of the two walls can be done together. In simple and effective embodiments, the cavity is blown out with compressed air.

In all embodiments, a width of the cavity is determined prior to introduction of the plastic material. The width of the cavity is determined in particular via a boroscope, but can also be determined or measured by other methods.

Particularly preferably, before the introduction of the plastic material, mist or smoke or the like is blown into the cavity and / or leaks in the wall construction are determined. Mist or other visible gases blown into the cavity typically leak out through existing leaks and can thus be optically detected. Following this, leaks are preferably sealed before the introduction of the plastic material. Breakthroughs on windows and / or doors are preferably sealed before introducing the plastic material.

In preferred developments, before the introduction of the plastic material on the sole of the wall construction, stones are removed or at least one stone is removed and debris is removed from the cavity through the resulting opening. Preferably, the resulting opening is closed again. Particularly preferably, the removed stones are used again in the resulting opening and any joints are grouted again, so that the resulting opening is completely closed again. By removing debris, it can be ensured that the two-shell wall construction sufficiently adheres to each other over its full height.

In advantageous embodiments, the plastic material is filled in stages. In this case, a filling step preferably takes between about 1 minute and 5 minutes and in particular between about 2 minutes and 4 minutes. A Fülletappe consists of filling the starting materials for the plastic material in the cavity, a reaction time of the starting materials, a rise time of the resulting plastic foam and a curing time. In the cavity, the starting materials form a reaction mixture which reacts and in particular rises as a plastic foam.

Preferably, in a filling stage, a layer height between about 30 and 100 cm and in particular between about 40 and 70 cm is generated. For this purpose, an amount of starting materials is introduced so that rises after the reaction of the resulting plastic foam in the desired height.

By layer heights of about 50 to 60 cm, a sufficiently fast mode of operation can be ensured, while on the other hand, the pressures resulting from the foaming remain so low that no deformation of the outer wall is to be feared.

Overall, the inventive method allows cost-effective securing a facing brick from, for example, bricks on an inner wall, wherein the outer wall is connected to the inner wall via a plastic material. In this case, the plastic material adhered to the entire surface of the outer shell and also the entire surface with the inner shell, so that a anchorless attachment of the facing wall to the inner shell is made possible.

In the inventive use of the fluids polyol and di- or polyisocyanate are used as starting materials for subsequent anchoring of two wall shells of an at least two-shell wall construction of an existing building. In particular, an insufficiently anchored or endangered facing wall is secured to the inner shell or inner wall. A wall shell serves as an outer shell and another wall shell as an inner shell and in a cavity between the existing outer shell and the existing inner shell, the starting materials are filled as fluids in particular batchwise. The starting materials react with each other and foam and form a plastic material and permanently connect the outer shell and the inner shell with each other in order to achieve a static secondary anchoring of the outer shell to the inner shell.

Particularly preferably, the mixture of the starting materials is introduced into the cavity for a period of between about 10 and 20 seconds and in particular about 15 seconds. This is followed by a reaction time in which the starting materials react with one another for a period of between about 20 and 40 seconds and in particular about 30 seconds. This is followed by a rise in which the starting materials foam. The rise time is preferably between about 45 and 90 seconds and is preferably about 60 seconds. Thereafter, the foamed material cures for a period of between 45 and 90 seconds and in particular about 60 seconds. Overall, preferably, a period of between about 2 minutes 30 seconds and 3 minutes, during which a batch is filled. The proportion of the filling time is preferably between 5 and 25%, that of the reaction time between about 10 and 25%, that of the rise time between about 25 and 40% and also the proportion of the curing time between about 25% and 40%.

In all embodiments, a sealing material is preferably first introduced to window reveals and doors and other passages or openings or it is injected in the direction of the window reveals and / or doors a speaking material at right angles. Preferably, any leaks are sealed.

Further advantages and features of the present invention will become apparent from the embodiment, which will be explained below with reference to the accompanying figures.

In the figures show:

1 a schematic cross section through a conventionally secured front wall shell from the prior art;

2 a schematic cross section through a secured wall according to the invention; and

3 a schematic front view of the wall construction after 2 ,

1 shows a schematic cross section through an elaborately secured facing brick. The applicant reserves the right to apply for separate protection. Here is a section of a double-shell masonry 51 an existing building 50 shown in schematic cross section. The double-shell masonry 51 includes an inner shell or inner wall 2 and an outer shell or outer wall 3 , which is designed here as a superior facing shell and bricks 58 with joints in between 60 consists.

The existing building 50 may be, for example, an older building, in which due to weather or originally bad materials, the front wall shell 53 is no longer sufficiently secured or disposal is at risk. To refurbish the facade, holes are preferably drilled in the joints, so that renovation anchors consisting here of dowels 55 and spiral anchors 56 with hooks 57 be introduced to secure the facing shell. Before that, the joints 60 scratched out over a depth of 2 cm or even up to 5 cm. The joints can be replenished about halfway to give the bricklaying shell some stability.

After inserting the renovation anchor (spiral anchor 56 and hooks 57 ), the joints are renewed. This can z. B. the outer part 63 So the second layer 63 in the joints 60 be introduced. The first shift 62 can be inserted directly after scratching. Behind the fugue 60 is usually still old mortar 61 which in extreme cases can almost completely consist of sand material and thus contributes to the stability practically not at all or only very little. It is conceivable that the width 64 the old mortar layer 61 (almost or even) is just as big as the width 65 the first layer and the second subsequently introduced layer 63 , It is also possible, the joint network in one step z. B. after setting the Renovate renovation anchor and thereby the z. B. 2 cm deep scratched joint in 2 operations one after another refill.

Such a procedure works, but requires a relatively high material outlay. As a rule, special renovation anchors (dowels 55 and special anchors 56 ) be used. In addition, the scratching out of the joints 60 and possibly repeated filling of the joints very labor-intensive, so that such a secured facing brick 53 relatively high costs.

The result of the method according to the invention shows 2 , There is a building 100 or a section of a wall construction 1 shown in cross-section, the wall construction 1 the inner shell, which is only partially sectioned here 2 as a wall shell 12 includes. Furthermore, the wall construction 1 a wall shell 13 as outer wall or outer shell 3 on. Between the wall shells 12 . 13 is originally a cavity 4 provided for the rear ventilation of the facing wall or plaster wall 3 served.

The facing brick 3 is designed as a brick wall and can for example consist of clinker bricks. The individual stones or bricks 58 be through joints 60 separated.

In the wall construction 1 That's in the joints 60 Originally existing mortar material due to weather conditions and due to aging processes changed and has been partially washed out. This is the front wall shell 3 Departure endangered, so that a subsequent securing of the facing brick 3 has become necessary.

It is also possible to secure a facing wall shell, when outside on the front wall shell a heat insulation is to be applied and then the static loads are greater. With the invention, the facing brick can be sufficiently secured in this case.

According to the invention are bores 14 introduced into the front wall shell. The holes 14 are preferably placed in the joints, so that the individual bricks 58 completely preserved. It is possible that the holes 14 only at the crossing points of the horizontal and vertical joints introduced, so the individual stones 58 completely so that the visual appearance of the external façade remains substantially or completely unchanged.

After inserting one or more holes 14 becomes the width by means of a borescope 4 of the cavity 5 ie the distance of the inside 17 the inner shell 12 from the inside 19 the outer shell 3 determined. The measuring process can also be carried out using special measuring instruments.

Following this, at least one stone is regularly made 8th on the sole of the foot 7 taken as an opening 9 provide. It is also possible that several stones and especially several adjacent stones 8th be removed, so a correspondingly large opening 9 to provide. About the opening 9 it will remove any debris from the cavity 4 taken out, so that the cavity 4 essentially completely empty. Thereafter, the resulting opening is preferably closed again directly. These can be the removed stones 8th be used again and between the stones 8th will be rejoining 60 grouted.

It is also possible that initially the cavity 4 is blown out. For this purpose, preferably compressed air is used and it is the inside 17 the inner shell and it becomes the inside 19 the outer shell, that is, the cavity facing sides of the inner shell 2 and the outer shell 3 , dust-free with compressed air. It is also possible that other cleaning methods are used to rid the walls adjacent to the cavity of dust and other contaminants. This ensures that the best possible connection of the inner shell and the outer shell with each other on the plastic material 10 takes place, which is introduced subsequently.

It is possible and preferred that a mist or the like into the cavity via a fogger and / or a smoking machine or the like 4 blown in to any leaks 6 on the wall construction 1 find and seal.

After that, all required holes 14 made and each hole is closed by a closure element, for example in the form of a conical sealing plug. The closure elements 15 each have a conical section 16 which is plugged from the outside on the wellbore to close this tight.

This ensures that not unintentionally that for the production of the plastic foam 20 used material or the starting materials 21 through the holes 14 exit again.

As below or at the holes 14 the collection container 30 are provided, even when removing the nozzle 36 (see 4 ) possibly still emerging material or exiting starting materials 21 be reliably collected and do not pollute the outside facade or the outside 18 the front wall shell 3 ,

After the preparatory work, so measuring the width 4 of the cavity 5 , making or introducing the holes 14 , the removal of any existing debris from the cavity 4 , the detection of leaks 6 and their closure, the attachment of the collection container 30 and closing the holes 14 with closure elements 15 , can with the filling of the plastic material or the plastic material 10 to be started.

The filling takes place from bottom to top. This means that, for example, it starts in one corner of the building and there in the bottom row, for example, a sealing plug 15 at a hole 14 is removed. There then becomes eg a filling tube 36 with lateral exit (cf. 4 ) and it becomes the starting materials 21 of the plastic material 10 into the holes and thus into the cavity 4 filled. The filled as fluids starting materials 21 collects on the sole of the foot or on the respective floor of the cavity 4 at. There is a reaction, due to which the starting materials 21 react with each other and the plastic material 10 foams and rises while keeping the cavity 4 starting at the bottom starting at. The rising plastic foam 20 Practically no or very little pressure on the wall shells 12 . 13 out. During the ascent, the rising material, still in the fluid state, wets the insides 17 and 19 attached to the cavity 4 adjoin, completely. After stopping filling, the nozzle becomes 36 out of the hole 14 taken and the hole 14 will be back with a closure element 15 closed to prevent accidental leakage of material. Maybe from the nozzle 36 dripping fluids are reliably in the collection container 30 collected. The nozzle is blown out with compressed air before removal.

During a filling process, typically a height of between about 40 and 70, and more preferably between about 50 and 60 cm, is filled. The exact dimensions also depend on the width 5 of the cavity 4 and can be both larger and smaller.

It is possible through two or more holes 14 simultaneously starting materials 21 to fill in the cavity. For example, it is possible to start from two corners, the cavity 4 with the plastic material 10 to fulfill. It is also possible that every second, third or fourth bore is simultaneously exposed to a nozzle. As a result, the filling process can be accelerated as a whole, because it works in parallel at several points.

After filling a first batch or after filling to a first height, the upper holes are acted upon accordingly with the starting materials to a second layer of the plastic foam on the first layer 20 applied. The individual layers stick together in such a way that a substantially homogeneous mass in the cavity 4 arises, as it is in 2 is shown.

The plastic foam penetrates into all cracks and corners and projections and depressions on the inner walls 17 and 19 the wall shells 12 and 13 a, so that also noses 28 at depressions in the masonry and in particular at the joints 60 form, resulting in additional bonding and reinforcement of the connection of the wall shells 12 and 13 lead each other.

It makes sense that, in particular after foaming the cavity 4 still the joints 60 partially or completely scraped to there a new filler material 63 and in particular to introduce mortar material. If necessary, it can also be dispensed with.

Anyway, after the end of the filling process and the curing of the plastic foam 20 the closure elements 15 and the collection containers 30 away. The holes 14 can be rubbed and then reclosed with a suitable material, as known to those skilled in the art. - If necessary, on the outside of the facade at the holes each color to be applied in order to achieve a visual alignment of the sealed holes to the rest of the facade.

3 shows a frontal view of a section of masonry 1 of the building 100 on which the joints 60 here enlarged are drawn in order to clarify the principle. The holes 14 have a horizontal distance 31 to each other. The vertical distance 32 is also shown. Preferably, about square intervals under the individual holes 14 intended. It is also possible that the horizontal distance 31 single holes 14 is greater than the vertical distance 32 , It is also possible that in the horizontal and / or vertical direction individual holes have a smaller distance from each other than other holes, for example, if the cavity locally a different width 5 having.

Is marked in the lower area in 3 an opening 9 after removing a removed stone 8th remains there to remove debris from the cavity 4 before backfilling with the plastic material 10 refer to. In 3 are still the collection container 30 visible below the holes 14 on the outside of the outer shell 3 are attached.

Cross hatched is a batch 29 the plastic foam 20 , which results for example after filling and foaming. The plastic foam 20 the batch 29 is here up to a layer height 27 ascended.

4 shows a highly schematic representation of the apparatus used, wherein polyol 23 in an appropriate container before expected. Accordingly, a di- or polyisocyanate 24 stored separately in a container. propellant 22 like a pentafluorobutane 25 or a heptafluorobutane 26 can be in separate containers or in containers with the materials 23 and 24 be included. The fluids are pressurized into the mixing chamber 35 are introduced and mixed there completely and homogeneously and get over the nozzle 36 or filler tube 36 outward. The ingredients are via at least one high pressure pump 37 fed and step in the direction of the arrows 38 down from. The outlet opening on the filling tube 36 can be steered in the desired direction.

The nozzle will be backfilled 36 into a hole 14 introduced, so for example, for a period of 15 seconds from the nozzle, the mixed starting materials 21 into the hole 14 and thus into the cavity 4 is introduced. After a reaction time of, for example, about 30 seconds, the intumescent mixture rises for a period of about 60 seconds. In this case, the foam sets in the fluid state completely and tightly against the insides of the cavity bounding walls. After a first curing time of about 60 seconds, the resulting plastic foam 20 cured so far that you can continue working.

Overall, the invention provides an extremely advantageous procedure with which a front wall shell can be secured to the building wall on existing buildings and in particular also on listed buildings.

LIST OF REFERENCE NUMBERS

1

wall construction

2

Inner shell, inner wall

3

Outer shell, outer wall, front wall shell

4

cavity

5

Width of 4

6

leak

7

sole

8th

removed stone

9

opening

10

Plastic material

11

polyurethane

12

wall shell

13

wall shell

14

drilling

15

closure element

16

cone-shaped section

17

inside

18

outside

20

Plastic foam

21

starting material

22

propellant

23

polyol

24

Di- or polyisocyanate

25

Pentafluorobutane

26

heptafluorobutane

27

layer height

28

nose

29

charge

30

receptacle

31

lateral distance

32

height distance

35

mixer

36

Filling tube, nozzle

37

high pressure pump

50

existing buildings

51

Double-shell masonry

53

Facing wall

54

cavity

55

dowel

56

spiral anchors

57

hook

58

brick

59

hook

60

Gap

61

old mortar

62

first shift

63

second layer

64

Width of 61

65

Width of 62

100

building

Claims (17)

Method for subsequent anchoring of two wall shells ( 12 . 13 ) an at least two-shell wall construction ( 1 ) of an existing building ( 100 ) and in particular for securing insufficiently anchored or endangered facing shells ( 3 ), wherein a wall shell ( 13 ) as an outer shell ( 3 ) and the other wall shell ( 12 ) as inner shell ( 2 ), wherein in a cavity ( 4 ) between the existing outer shell ( 3 ) and the existing inner shell ( 2 ) an outer shell ( 3 ) and the inner shell ( 2 ) permanently interconnecting plastic material ( 10 ) is introduced to a static secondary anchoring of the outer shell ( 3 ) on the inner shell ( 2 ) to achieve. Method according to claim 1, wherein the plastic material ( 10 ) over the entire surface with the inner shell ( 2 ) and with the outer shell ( 3 ) glued. Method according to one of the preceding claims, wherein the plastic material ( 10 ) at least substantially by a plastic foam ( 20 ), whose starting materials ( 21 - 24 ) the cavity ( 4 ). Method according to claim 3, wherein the plastic foam ( 20 ) at least in part by polyurethane ( 11 ) is / is formed with substantially closed cell structure. Method according to one of the two preceding claims, wherein as starting materials ( 21 ) at least two fluids and in particular at least one polyol ( 23 ) and at least one di- or polyisocyanate ( 24 ) with simultaneous addition of pentafluorobutane ( 25 ) (R365mfc) and / or heptafluorobutane ( 26 ) (R227ea) as blowing agent ( 22 ) in the cavity ( 4 ) are introduced. Method according to one of the three preceding claims, wherein the plastic foam ( 20 ) shrinks after curing by less than 5% by volume or less than 1% by volume. Method according to one of the preceding claims, wherein prior to the introduction of the plastic material ( 20 ) a plurality of holes ( 14 ) by at least one wall shell ( 12 . 13 ) of the wall construction ( 1 ) is drilled. Method according to the preceding claim, wherein the bores ( 14 ) first with closure elements ( 15 ), which have a conical section ( 16 ) exhibit. Method according to one of the two preceding claims, wherein on an outer side ( 18 ) with the holes ( 14 ) provided wall shell ( 13 ) Collecting container ( 30 ) below the holes ( 14 ) to be ordered. Method according to one of the preceding claims, wherein prior to the introduction of the plastic material ( 10 ) the walls delimiting the cavity ( 17 . 19 ) of the outer shell ( 3 ) and the inner shell ( 2 ) are removed by blowing or washing out of dust. Method according to one of the preceding claims, wherein prior to the introduction of the plastic material ( 10 ) a width ( 5 ) of the cavity ( 4 ) is determined. Method according to one of the preceding claims, wherein prior to the introduction of the plastic material ( 10 ) Mist in the cavity ( 4 ) and leaks in the wall construction ( 1 ) be determined. Method according to one of the preceding claims, wherein prior to the introduction of the plastic material ( 10 ) Leaks ( 6 ) are sealed. Method according to one of the preceding claims, wherein prior to the introduction of the plastic material ( 10 ) on the sole of the foot ( 7 ) of the wall construction ( 1 ) Stones ( 8th ), through the resulting opening ( 9 ) And the resulting opening ( 9 ) is closed again, in particular the extracted stones ( 8th ) are used again. Method according to one of the preceding claims, wherein the plastic material ( 10 ) is filled in stages, whereby a filling step lasts between 2 minutes and 5 minutes and the filling of the starting materials ( 21 ) for the plastic material ( 10 ), a reaction time, a rise time and a cure time. Method according to one of the preceding claims, wherein at a filling stage a layer height ( 27 ) between about 30 cm and 100 cm and in particular between about 40 cm and 70 cm. Use of the fluids polyol ( 23 ) and di- or polyisocyanate ( 24 ) as starting materials ( 21 ) for the subsequent anchoring of two wall shells ( 12 . 13 ) an at least two-shell wall construction ( 1 ) of an existing building ( 100 ) and in particular for securing insufficiently anchored or endangered facing shells ( 3 ), wherein a wall shell ( 13 ) as an outer shell ( 3 ) and the other wall shell ( 12 ) as inner shell ( 2 ), wherein in a cavity ( 4 ) between the existing outer shell ( 3 ) and the existing inner shell ( 2 ) the fluids ( 23 . 24 ) and the starting materials ( 21 ) and foam and a plastic material ( 10 ) and the outer shell ( 3 ) and the inner shell ( 2 ) permanently connected to one another in order to achieve a static secondary anchoring of the outer shell ( 3 ) on the inner shell ( 2 ) to achieve.

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