DE19524170A1 - Weathered dam wall repair - by wall hole drilling to take heavy-load anchors and protective plate support anchors all concreted into place after plate welding in-situ - Google Patents

Abstract

A pattern of holes (12) is drilled into weathered concrete of the pre-treated exterior (6) of the dam (13) so that heavy-load anchors acting as connectors (14) placed in the holes can mount the reinforcement (15). Protective concrete plates (5) are secured at pre-set distance from the dam surface (6) so the interval between them can be poured with concrete to anchor the reinforcement in place. Dam exterior pre-treatment is by sandblasting followed by sealing and each anchor (14) has it own supporting anchor (20) held in the hole (12) by means of a heavy-load dowel (21). The reinforcement is preferably welded to the anchors (14) and perforated rails (25) are used to secure the support anchors (27) for the protective plates (5) as welded to them (27). A plate anchor is screwed onto the free threaded end of the support anchor concerned, the plates (5) being pre-welded to the plate anchors, leaving the plate anchor parts proud of the plates to be cut off after the welding operation.

Description

The invention relates to a method for applying a Protective layer on building surfaces, especially widowed concrete surfaces of dam walls.

Under the term "building surfaces" are in the frame This invention understood all surfaces on buildings a certain wear due to weather influences, environment exposed to or influenced by liquids are. These areas include z. B. especially outside surfaces of buildings, outer surfaces of bridges, inner surfaces of basins and especially the outer surfaces of dams that often subject to particularly high wear.

Such building surfaces or the associated structures are often made of concrete, stone or brick.

Previous measures for the renovation of such structures areas that are partially affected by the influences mentioned very high wear or high weathering under have often failed because of the fact that the Bil materials used for the protective layer are not sufficient could find adequate support on the area to be renovated. On known method is the so-called goal locking, in which the building surface to be renovated with an un indirectly applied concrete layer is provided. In particular special if the corresponding building area is upright stands, have carried out within the scope of the invention Research shows that the binding effect is often not sufficient is enough to achieve the required downtimes.

It is therefore an object of the present invention to provide a method Ren to apply a protective layer on the building surface chen to create with the comparatively inexpensive Way up a reliably holding protective layer can be brought.  

This task is solved by the characteristics of the contractor saying 1.

In principle, the method according to the invention comprises the following method steps:
First, depending on the type of building to be renovated, a drilling grid is made in the masonry of the building surface to be renovated.

Then the surface of the building is pre-treated to for example, weathered, crumbling material that doesn't has sufficient hold to remove more with the structure.

Then fasteners are placed in the previously in the Masonry holes inserted and in these fixed.

Reinforcement is then added to the connecting elements brought and attached in a suitable manner.

After this process, protective layer plates, in particular others in the form of concrete protective plates, in a pre-selectable Pre-paved distance in front of the building surface.

Then there is between the surface of the building to be renovated and the previously prefabricated protective layer panels a room created that receives the reinforcement and the binder is dense.

The last step is in this binder-tight space a curable binder, especially in the form of concrete (Special concrete), filled.

After the binder has hardened, the protective layer Plates securely connected to this and the bindem tel is via the connecting elements defined in the masonry  elements and the reinforcement attached to them regardless of a binding effect between the concrete layer and the to sa fixed surface of the building.

Thus, those previously encountered in the prior art Disadvantages eliminated and it can be permanent and simple protective layer to be produced for the building to be renovated factory surfaces are created.

There are three particularly preferred variants partial further developments of this reason explained above additional process flow according to the invention.

In the first variant, after drilling the hole grid, the blasting of the wall surface (if necessary with a Surface sealing), the setting of the connecting elements and adding the reinforcement in another process a carrier rail construction in the binder space to be filled, which is attached to the reinforcement is done. Then the protective layer panels are opened places and there are plate anchors in the perforated support seemed fixed. The concrete protection plates are attached to these Plate anchors attached, for example in the protection Layer plate holes are made through which the Reach through the plate anchor, with the attachment through a welding of the En protruding through the hole which is done with the plate. After pre-fastening the The binding agent space is sealed and the binding poured medium. After the binder has hardened (ex approx. 2 hours) the next sheet layer is moved sets. Finally, the concrete protective plate seams can be used be welded and parts protruding beyond the visible surface The plate anchors can be removed, preferably milled will.

In a variant of the aforementioned method, a Fastener used in the hole in the wall  factory glued. This connecting element the second Embodiment of the method according to the invention instructs a thread on its end protruding from the hole, on which an appropriately trained plate anchor is applied is screwed. The plate anchor can be an In threaded sleeve-like section and a Have base plate that is used to attach the protection layer plate serves.

In the third variant, a formwork arrangement is used Put the protective layer plates used. To do this the protective layer panels first with the wooden panels of the Formwork arrangement connected, which is usually a Nage lung is used. Then formwork anchors in the wall movement that fixes the wooden panel and partially the wood plate and reach through the protective layer plate. After this Installation of the unit made of protective layer plate and wood the formwork frame is flattened against the wood plate pressed and preferably by a screw connection connected to the formwork anchors. In accordance with the variants already described is also used for this variant with an arrangement of connecting elements Reinforcement previously fixed in the masonry, being free Screwed ends of the connecting elements spacers be used as a system and thus as a setting option for the distance of the protective layer plates in front of the top of the building serve area. After creating the formwork arrangement and fixation of the space to be filled is in turn abge seals and it can as with the previously described Varian ten the curable binder, preferably in the form of Special concrete to be filled. After that, the formwork arrangement removed and any final work can be done by be performed such. B. welding the seams between the plates.

The subclaims have further advantageous further training content of the invention.  

For the pretreatment of the building surface, one is used above all Sandblasting used.

Heavy-duty anchors can preferably be used as connecting elements arrangements are used, which is usually a support anchor and include a heavy-duty dowel. The heavy load dowels are placed in the holes previously made in the masonry gene used, after which the support anchors in the heavy-duty dowels be screwed in.

In an alternative embodiment, the heavy load anchor only a support anchor, which in the respective Hole is glued.

For fixing the reinforcement, which is usually used as steel Tongitterwerk is formed on the connecting elements a welded connection is preferably provided.

The perforated support rails can also be attached to the reinforcement preferably by a welded joint, basically each but also through other types of connection, such as screw connections attachments, riveted connections or adhesive connections will.

To create the space that can be filled with binder-tight material the protective layer panels on their inside, so the side that is in the assembled state on the surface of the building has, provided with sealing plates, which are rectangular in shape protective sheets along the narrow sides of extend from one long side to the other long side. At the Masonry itself is attached to system profiles that such are spaced so that they protect the sealing plates Layer plates are in contact if they are pre-fixed. There usually the renovation of the building from the floor area from the bottom position must have a bottom finish profile for creating the binder-tight space will see the bottom of the space to be created  seals. In this case, only one remains upper open area, which serves as a filling opening for the bandage medium can be used. It goes without saying that the white adjoining the first row only a last row of protective layer panels profile or a sealing plate because the previous mounted plate adjacent side of the second plate Use the strip profile of the neighboring panel as a sealing wall can.

Are expansion joints provided in the masonry to be renovated? which is partly the case with bridges or dams, for example Case, must in the protective layer on the corresponding An expansion joint should also be provided. Dement speaking between two adjacent rows of plates in In this case, an expansion joint profile introduced, which to the neighboring plates is set. The expansion joint gap with a special, preferably elastic, filling mass filled.

To finish off the top of a complete protective layer a final profile is preferably used, the Masonry is fixed and this is the top layer of protection layer plates overlapped. This final profile can preferably glued to the protective layer panels or at least at least be connected via a seal.

Accordingly, at the lower end, if not as anyway Sealing provided for the space of the sealant, an Ab closing profile to be arranged on the masonry.

The invention is also embodied in a protective layer arrangement for building surfaces on the masonry of construction fasteners, one to the Fastening reinforcement and more number of protective layer plates, which under intermediate connection of a pre-fastening device to the connector  application elements can be applied or fixed.

Further details, features and advantages of the invention result from the following description of execution examples based on the drawing.

It shows:

Figure 1 is a schematically greatly simplified view of a building to be renovated in the form of a dam to illustrate some basic principles of the method according to the invention.

Fig. 2 is a schematic representation of the tools and equipment required for the implementation of the method according to the invention;

Figure 3 is a schematically slightly simplified representation of a sectional view through part of a protective layer which is produced according to the first embodiment of the method according to the invention.

FIG. 4A is a partial view of a detail of the protective layer accelerator as Fig. 3;

FIG. 4B is a partial sectional view of an expansion joint of the protective layer;

Fig. 4C is a more detailed view of a bottom portion of the protective layer arrangement of the invention;

Fig. 5 is a representation corresponding to Fig 3 of an alternative embodiment of a protective layer arrangement according to the invention.

Fig. 6A is a representation corresponding to FIG 5 a further embodiment.

Fig. 6B is a partial view of the embodiment of FIG. 6A;

Figure 7 is a schematically highly simplified illustration of a top layer of the protective layer. and

Fig. 8 is a Fig. 7 corresponding representation of a foot section of the protective layer arrangement according to the invention.

In Fig. 1, a dam 1 is shown schematically simplified as an example of a building to be renovated. The dam 1 has a dam crown 2 and a wall base 3 . Fig. 1 illustrates schematically a protective layer arrangement 4 which consists of a plurality of plates or protective layer in the present case concrete protective plates 5. This Be clay protection plates are applied to the dam wall surface 6 .

Fig. 1 shows that the entire surface 6 of the dam wall 1 is done by successive attachment of two rows of concrete protection plates 5 . Dement accordingly, Fig. 1 shows a first left row of two, which is already completed from the wall base 3 to the dam crown 2 . In addition, the bottom two layers of the second row of two have already started. The entire surface 6 is thus gradually provided with the protective layer arrangement 4 .

In FIG. 2, the components are shown, the conventional example required for the attachment of the protective layer arrangement 4. First, Fig. 2 shows that the dam wall can be provided 1 on both the mirror side facing the water and the outside with a protective layer arrangement 4.

To attach the protective layer arrangement 4 according to the invention and to carry out the method according to the invention, a tower crane 7 and a working crane 8 are usually used, which is installed on the dam crown 2 . The Ar beitskran 8 moves a work platform 9 up from the wall base 3 to the dam crown 2 .

Furthermore, a mixing plant and concrete pumping station 10 and a prefabrication and storage station 11 are shown.

In Fig. 3 is a partial view of an embodiment of the inventive layer arrangement 4 to illustrate a first embodiment of the inventive method is presented.

Fig. 3, the drilling of bores 12 illustrates representative reference to a bore in the wall 13 of the building to rehabilitate the surface 6. The bore 12 serves to fix a connecting element 14 , which in the example is designed as a heavy-duty anchor. The heavy-duty anchor 14 has a heavy-duty dowel 21 arranged in the bore 12 and a support anchor 20 . The support anchor 20 is screwed into the bore 12 after arranging the heavy-duty anchor 21 and thereby fixed in the masonry 13 .

Although usually the building surface has been treated 6 before setting the heavy-duty anchor, for example by sand blasting, the distance of the free end is of the carrying armature 20 over the previously untreated surface 6 does not change, since the depth of the hole 12 previously made continuously from the untreated surface 6 was determined.

After setting the connecting elements 14 , a reinforcement 15 , for example in the form of a reinforced concrete grid, hangs up on the connecting elements 14 by means of suspension hooks 16 and then preferably fixed to them by a weld connection 17 .

In the embodiment according to FIG. 3, perforated support rails 25 are fastened to the reinforcement 15 , for example likewise by means of a welded connection 26 . The mounting rail 25 and its attachment to the reinforcement 15 can also be seen in FIG. 4A. As shown in FIG. 4A shows, the mounting rail 25 is formed for example as a rectangular ver with holes 30 overlooked metal strip.

For pre-fixing of the concrete protective plates 5 to the support slide plate 25 are NEN armature 27 secured thereto, as representatively shown in Fig. 3, for every support rails 25 and supporting stay 27 is illustrated. The support anchor 27 has a shaft with an anchor head 28 which is slotted and is therefore resilient. The fixation is carried out by a kind of snap-lock connection of the anchor head 28 in the holes 30 of the mounting rail 25 , as can be seen in FIG. 3.

The support anchor 27 also has a free of the support rail 25 and the surface 6 groundbreaking plate anchor part 33 , which extends through a recess 31 in the concrete protection plate 5 . The concrete protection plate 5 can be prefixed to the plate anchor by a connecting device, preferably designed as a welded connection 32 . In this state, the concrete protection plate 5 rests against the end face of the free end of the connecting element or heavy-duty anchor 14 , which defines the previously set distance from the untreated surface 6 .

With this arrangement, a space 18 is formed, into which binding agent, preferably in the form of concrete 19 , is filled after a seal to be described below.

In the lower part of Fig. 3, this filled state is shown sym bolisch. This illustrates that claw elements 77 engage the concrete protective plate 5 in the cast concrete 19, and thus the final fixation of the concrete protective plate 5 effect. Since the filled concrete mass 19 can be supported, among other things, above all on the reinforcement 15 , a firm bond results even if the boundary layer between the concrete 19 and the surface 6 does not offer optimal support, because the reinforcement 15 is independent of this support the connecting elements 14 fixed.

In Fig. 4B, another detail of the protective layer arrangement 4 according to the invention. This is an expansion joint arrangement that is usually seen before when the masonry 13 is provided with an expansion joint 70 . In this area, the protective layer arrangement 4 is also provided with an expansion joint profile, which is designated in FIG. 4B with the reference symbol 62 .

The expansion joint 62 includes a bendable, flexible With telteil 63 and U-shaped in one piece on the central part 63 integrally formed holding and connecting portions 64 and 65 on. On the connecting sections 64 and 65 sealing tongues 66 and 67 are formed, which lie on top of each other in the assembly state shown in FIG. 4 and thus seal the U-shaped space enclosed by the central part 63 .

Fig. 4B also illustrates that the U-shaped holding and connecting portions 64 and 65 encompass the adjacent mutually facing ends of second concrete protection plates 5 , whereby the expansion joint profile 62 is held captive.

Fig. 4B also illustrates strip profiles or sealing plates 55 and 56 , which are at right angles to the inner surfaces 57 and 58 of the concrete protection plates 5 on these, for example by means of welded connections 68 , 69 are fixed. These sealing plates or strip profiles 55 and 56 interact in the assembled state with contact profiles 59 and 60 which are fixed to the masonry 13 . Fig. 4B illustrates that the arrangement is selected so that the strip profiles 55 and 56 rest over the entire surface of one leg of the L-shaped bearing profiles 59 and 60 in the example. This arrangement serves to seal the space 18 , which, as explained above, is filled with concrete 19 .

The expansion joint gap 71 also visible in FIG. 1 between the masonry 13 , the previously described lateral sealing lines and the expansion joint profile 62 is usually cast by means of an elastic filling compound.

Fig. 4C also explains in detail a floor end profile 61 , which is also L-shaped in the example and is usually attached to the wall base 3 or a part in the lower area of the building surface to be renovated. This bottom end profile serves to accomplish the necessary sealing of the lower part of the space 18 in this area, since the concrete protective plate 5 , as shown in FIG. 4C, rests on the inside against the upright leg of the L-shaped bottom end profile 61 . Neither in the arrangement of FIG. 4B nor in the arrangement of FIG. 4C, additional fastening measures between the parts 55 and 56 or 59 and 60 and the floor protection plate and the upright leg of the L-shaped bottom section profile 61 are required because when filling of the concrete 19 this presses the respective parts sufficiently close together.

In Fig. 5, an alternative embodiment is shown, which differs from the embodiment according to FIG. 3 in that the connecting element 14 only comprises the support anchor 20 , which is fixed in the bore 12 by means of an adhesive connection 23 , so that the arrangement a heavy-duty dowel is not required.

Furthermore, this embodiment differs in that the protective layer plate or concrete protective plate 5 is pre-fixed. Because in this embodiment, a free end 38 of the support armature 20 has an external thread 24 , which can come into engagement with an internal thread 36 of a sleeve-shaped plate core 34 , as shown in FIG. 5. The plate anchor 34 also has an on kergrundplatte 35 , so that there is a one-piece T-ge configuration. Fig. 5 shows that by accordingly deep or less deep screwing the Plat tenankers 34, the distance from the surface 6 lets len set. The anchor plate 5 has recesses through which the sleeve-shaped body of the plate anchor 34 engages. Thus, the anchor base plate lies on the edge on the outer surface 39 of the concrete protection plate 5 , which makes a connection by means of a welded connection 37 possible, as shown in FIG. 5. This accomplishes the prefixing of the concrete protective plate 5 at a preselectable distance from the surface of the building 6, which is independent of a surface pretreatment.

Once this pre-fixation has taken place (and possibly the previously described sealing of the room 18 ), curable binder, in particular in the form of concrete 19, is filled into the room 18 , which accomplishes the final fixing of the concrete protective plates 5 via the claw elements 77 . As illustrated in FIG. 5, a reinforcement 15 is of course also arranged on the connecting elements 14 , so that reference can be made to the previous embodiments in this regard.

In FIGS. 6A and 6B, a further alternative is shown exporting approximate shape, for pre-fixing of the protective layer plates or concrete protective plates 5 a formwork assembly 49 is in used.

In particular from Fig. 6B, it follows that as the connection element 14, in turn, a heavy-duty anchor is provided, which can be fixed in the bore 12, for example by means of an adhesive or in principle also by means of heavy duty dowels. Again, a reinforcement 15 is fixed to the connecting elements 14 .

The connecting elements 14 are provided at their free end with a thread 54 onto which a spacer 53 can be screwed, as can be seen in FIG. 6B, lower connecting element 14 . The spacer 53 , which is designed as a threaded sleeve with a flat outer end face, serves as a distance adjusting device and contact surface for the concrete protective plates 5 , in order to in turn be able to set the pre-selectable from the unworked surface 6 .

To pre-fix the concrete protective plates 5 , these are first nailed onto a wooden plate 48 of the formwork arrangement 49 . If necessary, holes 52 are made in the protective clay plates to create a passage recess for formwork anchors 40 , which are fixed by means of dowels 41 in holes 43 of the masonry 13 . The formwork anchors 40 are preferably positioned above the upper end of the concrete protective plates 5 , as can be seen from the upper part of FIG. 6B. In order to achieve a sufficient fixation before, however, it is often necessary to provide additional formwork anchors 40 lying in the area of the concrete protection plate 5 , for which purpose the previously explained bores 52 are required, which is also evident from FIG. 6B.

The formwork arrangement 49 also has a formwork frame 50 , which is used to press the composite of concrete protection plate 5 and wooden plate 48 by means of the formwork anchor 40 .

After the heavy-duty anchors 14 and the reinforcement 15 are installed as usual, the formwork anchors 40 are fixed by screwing their threaded parts 42 into the dowels 41 on the masonry 13 . The composite of plate 5 and plate 48 is then set up and pressed against the end faces of the spacers 53 by means of the formwork frame 50 and a screw connection (thread 45 , nut 46 , locking washer 47 ).

This arrangement in turn results in the space 18 to be filled with binder, which is optionally sealed laterally and on the underside, as previously explained. After filling with concrete 19 and after it has hardened, the formwork arrangement can be removed. Any necessary holes 52 in the concrete protection plates 5 are closed, for example, by a friction weld.

Usually in this variant of the invention Process four formworks in use, two formworks be covered with concrete protective plates, whereas the two other formwork on the building is in use.

In Fig. 7 an uppermost layer 72 of the protective layer arrangement 4 is shown, which is covered by an end profile 73 . As illustrated in FIG. 7, in the example the end profile 73 is approximately Z-shaped and rests with one leg on the masonry and is fastened at this point by means of a fixing device 74 . The middle part covers the upper region of the uppermost layer 72 and merges into another leg, which bears in an overlap 75 on the outer surface of the concrete protective plates 5 . This overlap area 75 can additionally be provided with a seal or an elastic and sealing adhesive connection between the end profile and the outer surface of the concrete protective plate 5 .

Fig. 8 illustrates the arrangement of an end profile 76 in the region of the base of the wall, this end profile 76 is also essentially Z-shaped, and thus has a central part sealing the space 18 downwards and two legs, one of which is fixed to the masonry 13 is while the other abuts the concrete protection plate 5 . A fixation of this leg is usually not necessary, since the filled concrete 19 presses the concrete protective plate 5 sufficiently tight against the leg of the profile 76 from .

In addition, it should be said that usually between the Concrete protective plates are located after attaching them Joints and seams are welded to a closed one To reach outside area. Furthermore, in recesses made in the concrete protective plates and Holes also closed.

Claims (23)

1. A method for applying a protective layer arrangement ( 4 ) on building surfaces ( 6 ), in particular weathered concrete surfaces of dams ( 1 ), with the following method steps:

• - Drilling holes ( 12 ) in the masonry ( 13 ) of the building surface ( 6 ) according to a predetermined Ras ter,
• - pretreatment of the building surface ( 6 ),
• - Placing connecting elements ( 14 ) in the bores ( 12 ),
• - Attaching and fastening a reinforcement ( 15 ) to the connecting elements ( 14 ),
• - Pre-fastening of protective layer plates ( 5 ), in particular concrete protective plates, at a selectable distance from the building surface ( 6 ),
• - Creation of a binder-tight fillable space ( 18 ) between the building surface ( 6 ) and the plates ( 5 ), in which the reinforcement ( 15 ) is arranged, and
• - Potting the space ( 18 ) with a curable binder ( 19 ), in particular in the form of concrete.

2. The method according to claim 1, characterized in that the pretreatment by means of sandblasting the upper surface of the structure ( 6 ), and preferably a sealing of the same ben, is carried out. 3. The method according to claim 1 or 2, characterized in that heavy-duty anchors ( 14 ) are used as connecting elements. 4. The method according to claim 3, characterized in that the heavy-duty anchors ( 14 ) each have a support anchor ( 20 ) which is fastened by means of a heavy-duty dowel ( 21 ) which can be inserted into the respective bore ( 12 ) in the masonry ( 13 ). 5. The method according to claim 3, characterized in that the heavy-duty anchors ( 14 ) each have a support anchor ( 20 ) which is glued into the respective bore ( 12 ). 6. The method according to any one of claims 1 to 5, characterized in that the reinforcement ( 15 ) with the connec tion elements ( 14 ) is welded. 7. The method according to any one of claims 1 to 6, characterized in that perforated support rails ( 25 ) on the reinforcement ( 15 ) attached, preferably welded. 8. The method according to claim 7, characterized in that plate anchors ( 27 ) are fastened to the mounting rails ( 25 ). 9. The method according to claim 7 or 8, characterized in that the plates ( 5 ) on the plate anchors ( 27 ), preferably by welding, are attached. 10. A method according to any one of claims 1 to 6, characterized in that a respective anchor plate (34) of the respective support anchor (20) is screwed onto a threaded (24) free end (28), and that the protective layer- Plates ( 5 ) for pre-fastening to the plates anchor ( 34 ) attached, preferably welded. 11. The method according to any one of claims 1 to 10, characterized in that over the visible surface ( 39 ) of the plates ( 5 ) protruding plate anchor parts ( 33 , 35 ) are separated after the casting process. 12. The method according to any one of claims 1 to 6, characterized in that formwork anchors ( 40 ) in the masonry ( 13 ) of the building surface ( 6 ) are attached. 13. The method according to claim 12, characterized in that the protective layer panels ( 5 ) on wooden panels ( 48 ) of a formwork arrangement ( 49 ) are attached and pre-attached to the formwork anchors ( 40 ) by means of a formwork frame ( 50 ). 14. The method according to claim 13, characterized in that after the casting process, the formwork arrangement ( 50 ) is removed ent and in the protective layer plates ( 5 ) previously for the formwork anchor ( 40 ) holes ( 52 ) are closed. 15. The method according to any one of claims 1 to 14, characterized in that to create the fillable space ( 18 ) at least in the assembled state on the building surface ( 6 ) facing inner surfaces of the plates ( 5 ) at least one strip profile ( 55 , 56 ) is attached along a narrow side,
that on the structure surface ( 6 ) system profiles ( 59 , 60 ) for the last profiles ( 55 , 56 ) are attached, and
that, if necessary, bottom end profiles ( 61 , 76 ) are arranged. 16. The method according to any one of claims 1 to 15, characterized in that after the casting process, the seams between the plates ( 5 ) are closed, preferably welded. 17. The method according to any one of claims 1 to 16, characterized in that in the area of masonry ( 13 ) provided expansion joints ( 70 ) each an expansion joint profile ( 62 ) between adjacent protective layer panels ( 5 ) is arranged by fixing them. 18. The method according to claim 17, characterized in that the expansion joint gap ( 71 ) is filled with a filling compound. 19. The method according to any one of claims 1 to 18, characterized in that the uppermost plate layer ( 72 ) is covered by an end profile ( 73 ) which can be fixed on the masonry ( 13 ). 20. The method according to any one of claims 1 to 19, characterized in that preferably concrete protective plates with claw elements ( 77 ) on the inner surface ( 57 , 58 ) and dimensions of preferably 10 m × 1.5 m are used as protective layer plates. 21. Protective layer arrangement ( 4 ) for the renovation of building surfaces ( 6 ), in particular weathered concrete surfaces of dams ( 1 )

• - With a plurality of connecting elements ( 14 ) which are in the masonry ( 13 ) of the building surface ( 6 ) holes ( 12 ) can be fixed,
• - With a reinforcement ( 15 ) which can be fastened to the connecting elements ( 14 ),
• - With a pre-fastening device ( 25 , 27 ; 34 ; 49 ) for protective layer plates ( 5 ); and
• - With sealing elements ( 55 , 56 , 59 , 60 , 61 , 76 ) to create a binder-tight space ( 18 ) for a curable binder ( 19 ).

22. Protective layer arrangement according to claim 21, characterized by an expansion joint profile ( 62 ) which can be fastened to the protective layer plates ( 5 ). 23. Protective layer arrangement according to claim 21 or 22, characterized marked by an end profile ( 73 ).