EP3191655B1 - Assembly comprising a component - Google Patents

Description

The invention relates to an assembly comprising a component, for example a structural bearing or a steel support, and an anchoring plate which can be at least partially embedded in a concrete component for fastening the component to a concrete component. In this case, the anchor plate has at least one anchoring element which can be embedded in the concrete component for transmitting transverse forces and is connected to the component with at least one screw connection, wherein the screw connection has at least one screw and one nut with a protective cap.

Under an assembly is understood here a multi-part arrangement, which is composed inter alia of the anchor plate and a corresponding cooperating with the anchor plate component. Such a component may be formed for example by a structural bearing, a steel prop or by column feet. In general, a structural warehouse is used for the defined and, as far as possible, restraint-free storage of individual concrete components in structures of any kind, such as bridges, girders, houses, towers or parts thereof. In order to connect the component to the concrete component, such assemblies have an anchor plate, which produces a bond to the concrete component via at least one anchoring element, for example via a headed bolt. As an anchoring element according to the invention is any element to understand, which is suitable for the transmission of horizontal loads or shear forces in buildings. If interchangeability of the component is required, the component is connected to the anchor plate via at least one detachable screw connection. Since the anchor plate is to be at least partially embedded in the concrete component, parts of the screw are in the installed state on the concrete side facing the anchor plate. This is usually the nut of the screw, but may also be a screw head of the screw.

For a component to remain interchangeable even after many years of use, it must be ensured that the screw connection can be detached over the service life of the building. Correspondingly, it must be prevented that the concrete penetrates into the thread of the screw connection when the anchor plate is cast into the component or the screw connection can no longer be loosened due to corrosion. To avoid this, known assemblies have a protective cap - sometimes referred to as corrosion protection cap - made of steel or other metal, which is plugged onto the nut of the screw and then welded to the anchor plate. As a result, the gap between the anchor plate and the metallic protective cap is sealed.

As a further function, the protective caps act as anti-rotation lock for the nut of the screw connection. When this is loosened or tightened, the welded-on protective cap prevents turning of the nut as a result of the torque applied during loosening or tightening. For this purpose, known caps are shaped much like a socket wrench, so that the mother can not twist in its interior. Co-rotation of the protective cap is prevented by the welded connection with the anchor plate.

A disadvantage of the known assemblies has been found that deformations and / or forces acting on the anchor plate out of the component, may be taken not only from the designated at least one anchoring element under certain circumstances. Due to the large cross-sectional dimensions of the protective caps, it is conceivable that deformations and / or forces on the protective cap are also introduced into the screw connection. Run these deformations or forces transverse to the axis of the screw, this may be problematic because the screw is usually already loaded as high-strength screw (HV) up to its load limit.

From the WO 2010/061192 A1 It is known that the cap is designed as attachable to the mother and einbetonierbare in the concrete cap and on the outside an external rotation and on its inside an internal rotation. This document discloses an assembly having the features of the preamble of claim 1.

To loosen or tighten a screw, a torque is applied to the screw head of the screw. To prevent the nut from spinning, it must be held in place by a holding torque. In the assembly according to the invention, this holding torque is exerted on the nut with the internal anti-twist protection of the anti-corrosion cap. This holding torque in turn is delivered by the corrosion protection cap on the outer rotation on its outer side to the concrete component. The outer anti-rotation on the outside of the corrosion protection cap thus causes the corrosion protection cap when loosening or tightening the screw relative to the concrete component is not twisted. The inner one Anti-rotation of the corrosion protection cap ensures that the nut is secured against rotation relative to the anti-corrosion cap.

Object of the present invention is therefore to show an assembly in which the screw connection between the anchor plate and the building bearing is not damaged despite the forces present in the component, which is economical to manufacture, has more compact dimensions and the release of the screw even after a long period allows, with the cap is secured against detachment.

The solution of this object succeeds according to the invention with the assembly according to claim 1. Advantageous further developments of the module are described in the subclaims.

The assembly according to the invention is distinguished from the assemblies known from the prior art in that the protective cap has an inner lip, wherein the lip keeps the protective cap self-locking, so that the protective cap is secured against detachment. A detachment could for example be prevented during transport or during installation of the nut or the screw.

Conveniently, the protective cap is deliberately adjusted with regard to its deformability such that it consists of a material which is more easily deformable compared to the concrete component and / or is shaped such that it deliberately gives way in the installed state to deformations and / or forces acting transversely to the axis of the screw connection, so that resultant forces are introduced into the at least one anchoring element of the anchor plate instead of into the screw connection. In addition, the maximum deformability of the corrosion protection cap is limited so that the nut can be tightened again after loosening the screw.

The deformability of the corrosion protection cap causes a deformation or force acting on the corrosion protection cap to cause no counterforce in the screw connection. Instead, the corrosion protection cap yields, which is why the acting deformation or force can ultimately act on the at least one anchoring element of the anchor plate and is finally derived therefrom. In addition to acting loads on the concrete component are also responsible for deformations or forces within the concrete component and volume changes of the concrete by shrinkage, swelling or creep. Although the deformations resulting from these effects are relatively low, the resulting forces due to the high modulus of elasticity of concrete are correspondingly large. By the execution of the cap of a more easily deformable material, such as a material with a lower modulus of elasticity than concrete, can be selectively controlled at which forces the material of the cap deformed. On the other hand, the maximum deformability of the protective cap must be limited or their material must not be too easily deformable. This ensures that the protective cap using the inner and outer rotation can remove the occurring when loosening and tightening the screw holding torque without deforming it so that the nut rotates.

In other words, it is thus achieved that transverse forces are absorbed mainly in the anchoring element and do not act on the screw connection.

In addition, the thickness of the wall thickness can influence the deformability of the protective cap. With a thick wall thickness, there is more way by deformation of the material to yield a deformation and / or force transverse to the axis of the screw direction, as is the case with a protective cap with a thin wall thickness.

Instead of a nut, the cap can also be plugged onto a suitably shaped screw head of a screw. After concreting in the anchor plate and the cap, turning of the screw is prevented when the nut is to be loosened.

It is expedient if the protective cap protects the screw and / or the nut from contact with concrete. This ensures that the screw remains releasable, and not by entering concrete actually no longer detachable connection.

According to the invention, the protective cap has an inner lip, wherein the lip keeps the protective cap self-locking, so that the protective cap is secured against detachment. A detachment could for example be prevented during transport or during installation of the nut or the screw.

In this context, it is particularly useful if the protective cap has a lower edge, wherein the lip protrudes on the inside of the lower edge. The inner diameter of the lip is smaller than the largest outer diameter of the nut. This avoids that when filling the concrete in the formwork, the protective cap from the nut of the screw apart. As a result, concrete would penetrate into the screw and cause their damage. In addition, the lip keeps the protective cap in the correct position to ensure a tight fit of the mother by turning.

The lip is preferably formed so thin that it can flex flexibly. Since the inner diameter of the lip is smaller than the largest outer diameter of the nut, the lip bends when attaching the corrosion protection cap on the mother.

It is particularly useful if the lip, after the cap is completely attached to the mother, located below the mother, since they can then return to their original shape. The lip is tight around the screw connection, so that a tight fit the protective cap on the nut is guaranteed and the penetration of concrete or corrosive substances over the useful life of the structure is effectively prevented.

In an advantageous development of the assembly, the protective cap consists of an elastically and / or plastically deformable material, preferably a plastic, in particular a thermoplastic. The use of an elastically and / or plastically deformable material, in contrast to a material with brittle material behavior, ensures that when a deformation and / or force is exerted on the protective cap, it is deformed without cracks forming in the protective cap. As a result, the mother of the screw located within the cap is still protected from the ingress of moisture or corrosion-promoting substances, even if the protective cap has already deformed.

The use of plastic for the production of the cap also offers a wide range of materials that are more or less easily deformed compared to the concrete component. As a result, the ratio between the force required for the deformation of the protective cap and the holding torque required for loosening and tightening the screw connection can be adjusted to each other.

The forces that can be removed transversely to the screw axis, are also smaller according to the screw dimensions, as with screws of large dimensions. On the other hand, the holding moments occurring in screw connections with a small screw diameter are also lower than those of screw connections with a larger screw diameter. Accordingly, it is conceivable to produce protective caps for screw connections with a smaller screw diameter made of a plastic which is easier to deform than the plastic for protective caps for screw connections with a large diameter.

In addition, the use of a thermoplastic material offers the possibility to economically produce protective caps in a variety of forms.

Preferably, an assembly as external rotation of the cap on at least one projection or the like for positive retention in the concrete. The term "Vorsprung" should not be interpreted too narrowly here. A surface design of the cap in the form of corners, webs or a polygon or any other structure that allows snagging in the concrete, this is to be understood. When installing the assembly in a concrete component of the first liquid concrete is poured into a formwork in which the anchor plate of the assembly is arranged so that the anchor plate at least partially comes into contact with the liquid concrete. The liquid concrete encloses here also attached to the outside of the protective cap rotation with a projection, so that on the mother of at least one Screw connection plugged cap after curing of the concrete is positively connected to the concrete, whereby a rotation of the cap relative to the concrete component is easily and effectively prevented.

In a preferred embodiment of the assembly is between the plugged on the mother cap and the mother a game available. This play makes it possible for the protective cap to give way deliberately as a result of the deformation and / or force acting transversely to the axis of the screw connection and thus the at least one screw connection is decoupled from the acting deformations and / or forces in a particularly effective manner.

Further, the assembly as an internal anti-rotation at least one counter-element, which is after the attachment of the protective cap on the mother, at least partially in contact with a side surface of the nut. When using the protective cap, it must be ensured that the screw connection can be loosened without difficulty even after a long service life, or that screwing of the nut during loosening or tightening of the screw connection is prevented. This is ensured according to the invention, since the rotation is effected by a positive connection between the side surface of the nut and the counter-element on the inside of the protective cap. Under a side surface of the nut is understood to be a flat, almost parallel to the screw axis extending portion on the edge of the nut. The counter-element is a structure on the surface inside the protective cap, which protrudes after fitting, the corrosion protection cap on the nut in the direction of the axis of the nut and produces a positive or frictional connection with the nut or a side surface of the nut. The counter element can be for example a mating surface, a web, a rib or another suitable contour.

For example, when using a hex nut as a nut, the inner rotation preferably have counter-elements in the form of three mating surfaces, which are arranged in the cap so that after attaching the cap on the hex nut preferably every second hexagonal surface of the hex nut at least partially in contact with a the counter surfaces is. Since the protective cap is preferably made of a material that is more easily deformable than concrete, unilateral punctiform loads lead to force peaks and, as a result, to deformation of the material of the protective cap. This effect can also occur if, when loosening or tightening the screw, the holding torque is transmitted from the cap through the contact of the mating surface with a side surface only on one side to the mother.

In order to avoid that the holding torque in the cap causes a punctual one-sided overload, it has therefore proven to be advantageous if the cap has a plurality of evenly distributed on its inside counter-elements. Preferably, these are evenly in contact with one of the side surfaces of the nut.

When using commercially available hexagon nuts with six side surfaces thus thus, for example, a protective cap with three mating surfaces use. Accordingly, for example, when using square nuts a protective cap with two mating surfaces can be used. This ensures that the holding torque is transmitted evenly from the cap to the mother.

It is also conceivable that a plurality of arranged on the inside of the cap counter-elements are arranged, which can be brought into engagement with the nut or one or more side surfaces of the nut, so that a further rotation is effectively prevented. For example, a plurality of webs or ribs may be provided, whereby the placement of the protective cap is facilitated on the mother.

In addition, such an arrangement has the advantage that the existing between the cap and the mother game evenly distributed over the side surfaces of the mother, the uniform distribution of the game is mainly achieved by the lip. Accordingly, the protective cap of the assembly according to the invention from different directions transverse to the axis of the screw can deformations and / or forces evenly yield.

In a preferred embodiment of the assembly, the protective cap in the region of the at least one counter element has a free inner diameter that is smaller than the largest outer diameter of the nut, and larger than the smallest outer diameter of the nut.

In commercial hex nuts, the smallest inner diameter is formed by the distance from two opposite side surfaces of the hexagon, the largest outer diameter corresponds to the distance between two opposite edges of the hexagon. The free inner diameter of the corrosion protection cap corresponds to the diameter of the circle, which touches the inside or the at least one counter element inside the protective cap. In other words, the free inner diameter corresponds to the size with the dimensions of a hypothetical body in the interior of the cap can just just rotate without the rotation of the body is obstructed by the rotation of the cap. By varying the free inner diameter, it is thus possible to set how much play is present after the protective cap has been fitted onto the nut, between the nut and the protective cap. If the free inner diameter corresponds to the smallest outer diameter of the nut, there is no play. If the measure of the free inner diameter exceeds the dimensions of the largest outer diameter of the nut, this will cause the nut to spin when loosening or tightening the screw connection. Since in a play-free mounting of the mother through the cap, the maximum transferable holding torque is greatest, and in a large game, the ability to yield transverse to the axis of the screw deformations or forces is largest, these characteristics of the cap over a variation of the free inner diameter can be particularly easily influenced.

In a further development of the module, the protective cap has a tilt lock for the nut. If the replacement of the structural bearing is required in a building, this can be removed from the structure by the screw connection is released, which connects the building bearing with the anchor plate. When installing the new building bearing, it may happen that the nut located in the cap tilts from the screw axis on the side. As a result, the screw of the screw connection can no longer be screwed into the screw hole and the thread. Since the mother together with the protective cap and the anchor plate in the concrete of the structure is inaccessible concreted, the mother of the screw can be achieved only by free-standing of the concrete and raised again. Since this is to be avoided, the assembly according to the invention has a tilt protection in its protective cap. As a tilt protection, for example, be located on the inner surface of the cap befindlicher projection which avoids the tilting of the nut simple and effective and keeps them in position.

In a preferred embodiment of the assembly, the protective cap is filled with a corrosion inhibitor in such a way that after the protective cap has been fitted onto the nut, the free surfaces of the nut are wetted with the anticorrosive agent. In particular, grease and other substances which prevent ingress of moisture and corrosive substances to the screw connection are suitable as corrosion protection agents. At the same time, the corrosion protection agents cause the screw connection to be easily detached even after the service life of the component has been reached.

Fig. 1

einen Schnitt durch ein erstes Ausführungsbeispiel einer erfindungsgemäßen Baugruppe;

Fig. 2

einen Ausschnitt aus der in Fig. 1 gezeigten Baugruppe;

Fig. 3

eine perspektivische Ansicht einer Schutzkappe der in Fig. 1 und Fig. 2 gezeigten Baugruppe;

Fig. 4

einen Längsschnitt durch die in Fig. 3 gezeigte Schutzkappe der Baugruppe entlang der Schnittlinie A-A;

Fig. 5

einen Querschnitt der in Fig. 3 und Fig. 4 gezeigten Schutzkappe der Baugruppe entlang der Schnittlinie B-B;

Fig. 6

eine Draufsicht auf ein Mutter der Schraubverbindung, wie sie in der in Fig. 1 gezeigten Baugruppe verwendet wird;

Fig. 7

einen Schnitt durch die in Fig. 3 gezeigte Schutzkappe, wobei die Schutzkappe auf eine Mutter aufgesteckt ist;

Fig. 8

einen Schnitt wie in Fig. 7, wobei die Schutzkappe auf eine Mutter aufgesetzt ist; und

Fig. 9

alternative Ausführungen der Gegenelemente der Schutzkappe.

The invention will be explained in more detail with reference to an embodiment shown in the drawings, the assembly. In it shows schematically:

Fig. 1

a section through a first embodiment of an assembly according to the invention;

Fig. 2

a section of the in Fig. 1 shown assembly;

Fig. 3

a perspective view of a protective cap of Fig. 1 and Fig. 2 shown assembly;

Fig. 4

a longitudinal section through the in Fig. 3 shown cap of the assembly along the section line AA;

Fig. 5

a cross section of in Fig. 3 and Fig. 4 shown cap of the assembly along the section line BB;

Fig. 6

a plan view of a nut of the screw, as shown in the in Fig. 1 shown assembly is used;

Fig. 7

a section through the in Fig. 3 shown protective cap, wherein the protective cap is mounted on a nut;

Fig. 8

a cut like in Fig. 7 , wherein the protective cap is placed on a nut; and

Fig. 9

Alternative versions of the counter elements of the protective cap.

In the figures, the same names are used for the same parts.

Fig. 1 shows an embodiment of an assembly 1 according to the invention with a component 2. The assembly 1 is in this embodiment, a bearing assembly 1. This has two anchor plates 4, which are each connected by two screw 6 with the executed in this embodiment as a structural bearing 2 component. In each of the anchor plates 4 four anchoring elements 5 in the form of head bolts 5 can be seen. The screw 6 consist of a screw 7 and a nut 8. As with the hatching in Fig. 1 is indicated, the lower anchor plate 4 is cast in a concrete component 3. In this case, the four head bolts 5 establish the bond between the concrete component 3 and the anchor plate 4. Each of the two nuts 8 shown the screw 6 between the lower anchor plate 4 and the structural bearing 2 are protected by a designed as a corrosion protection cap 9 protective cap against contact with the concrete of the concrete component 3. It can also be seen that the two nuts 8 of the screw 6 are located after the anchoring of the anchor plate 4 in the concrete of the concrete component 3 below the anchor plate 4 and are not accessible accordingly.

The upper one of the two in Fig. 1 shown anchor plates 4 is shown in a state before the anchor plate 4 is cast in a concrete component 3. Here, no corrosion protection caps 9 are attached to the two nuts 8 of the screw 6.

Fig. 2 shows a detail view of in Fig. 1 Shown is the lower anchor plate 4, which is connected to the building stock 2 via a screw 6. The screw 6 consists of a screw 7 and a nut 8. On the nut 8, a corrosion protection cap 9 is attached. The corrosion protection cap 9 protects the screw 6 during concreting of the concrete component 3 from contamination with concrete. The corrosion protection cap 9 has at its lower edge 23 on a lip 24 which below the nut 8 includes the screw 6 and so holds the corrosion protection cap 9 on the screw in position. Next seals the lip 24, the screw 6 against the ingress of corrosive substances. Next, the corrosion protection cap 9 a outer anti-rotation 11, which is in positive contact with the concrete of the concrete component and prevents the curing of the concrete twisting the corrosion protection cap.

Fig. 3 shows a perspective view of the corrosion protection cap 9. On the outside 10, four projections 17 of the outer anti-rotation 11 are shown, which prevent the concrete encapsulation twisting of the anti-corrosion cap in the concrete. Furthermore, it can be seen on the inner side 12 of the anticorrosive cap that it has a counter element in the form of a mating surface 18 of the inner anti-rotation 13. At its lower edge 23, the corrosion protection cap 9 also has a lip 24.

In Fig. 4 is a side view with partially cutaway view of in Fig. 3 shown corrosion protection cap 9 shown. The cut follows the cut line AA like this one in Fig. 5 is drawn. In the view of the corrosion protection cap 9, two projections 17 of the outer anti-rotation 11 can be seen on the outside 10. The longitudinal section through the corrosion protection cap 9 shows on the inner side 12 a lip 24 arranged at the lower edge 23 of the corrosion protection cap 9. This is designed as a narrow nose, so that the lip can be pushed away resiliently to the rear. Furthermore, it can be seen in longitudinal section that the projection 17 of the outer anti-rotation 11 is designed as a reinforcement of the wall 27. This is also true for the formation of the counter surface 18 on the inside 12. It can be seen that the mating surface 18 merges materially into the projection 17 of the outer anti-rotation device 11 as reinforced formation of the wall 27.

Fig. 5 shows a section of the corrosion protection cap 9 along the in Fig. 4 illustrated section line BB. It can be seen here that the corrosion protection cap 9 has six projections 17 as external anti-rotation 11. Furthermore, the corrosion protection cap 9 shown has three counter-elements formed as mating surfaces 18 as internal anti-rotation 13, which are arranged uniformly on the inner side 12 of the corrosion protection cap 9. It can be seen that each of the counter surface 18 arranged on the inner side 12 faces a projection 17 of the outer anti-rotation lock on the outer side 10. Next, the free inner diameter 20 is located, so the theoretical diameter of a complete rotation within the protective cap 9 allows.

Fig. 6 shows a nut 8 in the embodiment of a hex nut. This hex nut has on its outer side six side surfaces 19, which each form an edge 26 at their cutting lines. In the center of the nut 8 is a threaded screw hole 26. The illustration of in Fig. 6 In addition, the mother shown that the largest outer diameter 21 of the nut 8 is greater than the smallest outer diameter 22 of the nut 8. The smallest outer diameter 22 is the distance from two opposite side surfaces to each other, whereas the largest outer diameter 21, the distance from two opposite edges 26th is.

Fig. 7 shows a cross section of the corrosion protection cap 9, as already in Fig. 5 is shown, but the corrosion protection cap 9 is attached to a nut 8. The illustrated embodiment of the nut 8 corresponds to a hexagonal nut, as in Fig. 6 is pictured. On the inner side 12 of the corrosion protection cap 9, three opposing elements of the inner anti-rotation 13 designed as counter surfaces 18 are arranged. These are distributed uniformly over the inner surface 12 of the anticorrosive cap, so that every other one of the six side surfaces 19 of the nut 8 is opposite a counter-surface 18 or is in contact therewith. In addition, a game 16 is present between the counter surface 18 and the side surface 19. This clearance makes it possible for the corrosion protection cap 9 to yield to the corrosion protection cap of the deformation or force 15 when a deformation or force 15 acts transversely to the screw axis 14.

The in Fig. 8 shown cross section of the corrosion protection cap 9 corresponds to the in Fig. 7 cross section shown. In addition, a state is shown in which a moment M is exerted for loosening or tightening the screw 6. As a result of torque M, the nut 8 in the corrosion protection cap 9 is slightly rotated until every other one of the six edges 26 is in contact with one of the three mating surfaces 18 of the inner anti-rotation device 13. A rotation of the corrosion protection cap 9 is prevented by the at the six projections 17 of the outer anti-rotation 11 uniformly engaging holding torque HM.

In Fig. 9 are three other alternative designs for counter-elements shown. All three figures have in common that the nut 8 is shown in dashed lines. In the uppermost illustration, the counter elements 18a are designed in the form of webs or ribs, wherein the side surface 19 bears against two webs 18a in each case. The middle figure also shows counter-elements in the form of webs or ribs 18b, wherein these webs 18b have a trapezoidal outer contour. In the bottom picture of the Fig. 9 is a third alternative for counter elements shown. In this alternative, the counter-elements are in the form of teeth 18c. Common to all alternatives shown is that the corrosion protection cap 9 can be placed well on the nut 8, since the corrosion protection cap 9 only slightly against the nut 8 must be rotated.

In the case of these rib-like counter-elements 18a, 18b, it is also the case that in the cases of a geometric relative mobility between the protective cap 9 and the nut 8, the missing coaxial centering is likewise taken over by the lip 24. With increasing proportion of mobility due to deformation this need is increasingly eliminated.

LIST OF REFERENCE NUMBERS

1

Assembly / bearing assembly

2

Component / Structural Bearings

3

concrete component

4

anchor plate

5

Anchoring element / studs

6

screw

7

screw

8th

mother

9

Cap / corrosion cap

10

outside

11

External rotation lock

12

inside

13

Internal anti-twist device

14

Axis of the screw connection

15

Deformation / force

16

game

17

head Start

18

Counter-element / counter-surface

18a

Counter element / bridge or rib

18b

Counter element / bridge or rib

18c

Counter element / tooth

19

side surface

20

Free inside diameter

21

Largest outer diameter

22

Smallest outside diameter

23

Lower edge

24

lip

25

Screw hole with thread

26

edge

27

wall

M

Moment (tightening / loosening torque)

HM

holding torque

Claims (11)

1. Assembly (1) having a structural element (2), in particular a structural bearing or a steel column, and an anchor plate (4) which can be at least partially embedded in concrete for fixing the structural element (2) to a concrete component (3), the anchor plate (4) having at least one anchoring element (5), in particular a head bolt, which can be embedded in concrete for transmitting transverse forces, and which is detachably connected to the component (2) with at least one screw connection (6), the screw connection (6) having at least one screw (7) and a nut (8) with a protective cap (9), the protective cap (9) being configured as a cap which can be plugged onto the nut (8) and embedded in concrete, and having an outer anti-rotation device (11) on its outer side (10) and an inner anti-rotation device (13) on its inner side (12),
   characterized in that
   the protective cap (9) has an inner lip (24), the lip (24) holding the protective cap in a self-locking manner so that the protective cap (9) is secured against detachment.
2. Assembly (1) according to claim 1,
   characterized in that
   the deformability of the protective cap (9) is specifically adjusted such that it consists of a material which is more easily deformable than the concrete of the concrete component (3) and/or is shaped such that, when installed, it yields to deformations and/or forces (15) acting transversely to the axis (14) of the screwed connection, so that resulting forces are introduced into the at least one anchoring element (5) of the anchor plate (4) instead of into the screw connection (6), wherein the maximum deformability of the protective cap (9) being limited such that the nut (8) can be retightened after the screw connection (6) has been loosened.
3. Assembly (1) according to claim 1 or 2,
   characterized in that
   the protective cap (9) protects the screw (7) and/or the nut (8) from contact with concrete.
4. Assembly (1) according to one of the preceding claims,
   characterized in that
   the protective cap (9) has a lower edge (23), wherein the lip (24) projectes on the inside (12) of the lower edge (23), wherein the inside diameter of the lip (24) is smaller than the largest outside diameter (21) of the nut (8).
5. Assembly (1) according to one of the preceding claims,
   characterized in that
   the protective cap (9) consists of an elastically and/or plastically deformable material, preferably a plastic material, in particular a thermoplastic plastic material.
6. Assembly (1) according to one of the preceding claims,
   characterized in that
   the outer anti-rotation device (11) of the protective cap (9) has at least one projection (17) for form-fit mounting in the concrete.
7. Assembly (1) according to one of the preceding claims,
   characterized in that
   there is a clearance (16) between the protective cap (9) fitted on the nut (8) and the nut (8).
8. Assembly (1) according to one of the preceding claims,
   characterized in that
   the inner anti-rotation device (13) has at least one counter element (18) which can be brought at least partially into contact with a side surface (19) of the nut (8), after the protective cap (9) has been fitted onto the nut (8).
9. Assembly (1) according to claim 8,
   characterized in that
   the protective cap (9) has a free inner diameter (20) in the area of the at least one counter element (18, 18a, 18b, 18c) which is smaller than the largest outer diameter (21) of the nut (8) and larger than the smallest outer diameter (22) of the nut (8).
10. Assembly (1) according to one of the preceding claims,
    characterized in that
    the protective cap (9) comprises a tilt protection for the nut (8).
11. Assembly (1) according to one of the preceding claims,
    characterized in that
    the protective cap (9) is filled with an anticorrosive agent such that the free surfaces of the nut (8) are wetted with the anticorrosive agent after the protective cap (9) has been fitted onto the nut (8).

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