EP2060703B1 - Tie for shuttering - Google Patents

Description

Technical area

The invention relates to a formwork anchor for the tensile strength joining of formwork elements according to the preamble of claim 1.

In the field of reinforced concrete construction, walls are produced, for example, by placing two formwork elements with their formwork surfaces largely parallel to one another and anchoring them against one another by anchors which extend through the concrete that is filled later. By the anchor, the distance between the opposite formwork elements, and thus the subsequent wall thickness is further defined. The anchors must be solvable both from the mutually anchored formwork elements, as well as from the solidified concrete. For special applications, a so-called one-sided anchorage is provided, in which the armature can be attached and detached essentially from one side, the so-called anchor side, without having to carry out work steps on the opposite side.

State of the art

In this regard, a formwork anchor is known as Vorbenutzungsgegenstand under the name "Peri-Trio-Housing anchor", which consists of a one-piece rod, at the ends of which threads are formed, and whose central portion is designed as a slender cone. With the thread at one end of the anchor is screwed into a nut, which is fixed to a first formwork element which is provided on the opposite side. The conical section is in the area of the later concrete-filled zone, and the cone allows the anchor to be pulled out to the side where the cone has the larger diameter. At the thread provided at the other end, a nut is turned on, which cooperates with a second formwork element, which is provided on the anchor side, and by means of which the desired wall thickness can be adjusted.

It has been shown that the application of the nut on the thread and thus the setting of the desired wall thickness is time-consuming. In addition, the thread is susceptible to contamination. For example, there is the problem that the thread is contaminated with concrete during concreting and the anchor can be adjusted to a different wall thickness only after a complicated cleaning of the thread.

Another prior art is the document US 2,133,574 A in which a formwork anchor with a conical anchoring element is disclosed. The shuttering anchor further comprises a holder which is connectable via a plurality of holes provided on a cylindrical anchoring portion with this.

Presentation of the invention

The invention has for its object to provide a generic formwork anchors, which is less susceptible to contamination and allows a speedy adjustment of the wall thickness.

This object is achieved by a formwork anchor according to claim 1. Particularly preferred developments of the invention are specified in the dependent claims.

The invention is based on the idea to decouple the application and positioning of the anchoring element on the second anchoring portion on the one hand and the setting of the anchoring element on the second anchoring portion on the other hand in a generic formwork anchors. For this purpose is According to the invention provided that the anchoring element in relation to the second anchoring portion in the longitudinal direction thereof is freely displaceable and fixable via engagement means with respect to the second anchoring portion in its longitudinal direction.

In this way, it is possible to dispense with a thread in the region of the anchoring element and the second anchoring section, so that the anchoring element can be pushed and positioned quickly and without interference on the second anchoring section. Also, a removal of the anchoring element from the second anchoring portion can be done quickly, even with conventional concrete adhesions to these components. In addition, the formwork anchor according to the invention has a simple construction thanks to the omission of threads in the region of the anchoring element and the second anchoring portion.

The formwork anchor can be produced in the context of the present invention in various ways. In view of a simple and precise production and a high durability of the formwork anchor, however, it is provided according to a further development of the invention that the second anchoring portion and the at least partially conical portion are integrally formed. Further, the first anchoring portion is connected to the one-piece unit of second anchoring portion and at least partially conical portion, in particular fixed. This makes it possible to use as the first anchoring section conventional threaded rods or tie rods and to compress the only with the other parts of the formwork anchor in a simple and rapid and mechanically reliable manner.

According to the invention it is provided that the engagement means comprise at least one opening, in particular a passage opening in the second anchoring section. This results in a simple design a particularly safe and quickly produced engagement.

The same advantages can be achieved with regard to the anchoring element, if according to the invention, the anchoring element has at least two openings which are arranged offset in the longitudinal direction of the second anchoring portion. This results in a finer adjustability or fixability of the anchoring element with respect to the second anchoring portion, wherein the degree of fine adjustment by turning the anchoring element and reverse plugging the same can be further increased to the second anchoring portion.

In order to make such a rotation and reverse attachment of the anchoring element particularly simple, it is provided according to a development of the invention that the anchoring element is designed in several parts, wherein at least a part of the anchoring element of the or the remaining part (s) is solvable and in a deviating configuration is connectable again. In this way, as already mentioned above, the fineness of the anchoring element is increased with respect to the second anchoring portion, wherein the anchoring element is still largely unimpaired by contamination quickly, safely and precisely positioned and can be anchored.

In view of this simple, safe and trouble-free setting of the anchoring element with respect to the second anchoring portion is provided according to the invention that the engagement means comprise at least one locking element which is insertable into the at least one opening of the second anchoring portion and / or anchoring element.

According to one embodiment of the invention it is further provided that the at least partially conical section is formed several times conical. This makes it possible to achieve that, especially with thin walls, there is no excessively large annular gap between the formwork anchor and a formwork element through which the formwork anchor passes. This leads both to a lower reworking effort on the wall produced and to a lower cleaning effort on the formwork anchor. The formwork anchor can still be easily removed from the concrete.

According to a development of the invention, it is further provided that the second anchoring section has markings, in particular a scale. As a result, the respective wall thickness can be adjusted particularly safely, quickly and precisely.

In order to be able to release the formwork anchor safely and non-destructively from the concrete during stripping, it is provided according to a development of the invention that the second anchoring portion comprises load application means for releasing the formwork anchor from the concrete, for example suitable through-holes, hexagonal sections or the like.

According to a development of the invention, it is further provided that the shuttering anchor is at least partially coated, in particular chromed, wherein the coating is preferably in the range of at least partially conical section vorsch. In particular, in a crating results in a particularly easy release of the formwork anchors from the concrete with good danerhaft the formwork anchor.

Brief description of the drawings

Fig. 1

shows schematically a first side view of a formwork anchor according to the present invention;

Fig. 2

schematically shows a second side view of the in Fig. 1 Shuttering anchor shown;

Fig. 3

schematically shows a perspective view of the in Fig. 1 and 2 Shuttering anchor shown.

Detailed description of preferred embodiments

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

A formwork anchor 10 as a preferred embodiment of the preferred embodiment of the present invention is shown in FIGS FIGS. 1 to 3 shown schematically in two side and one perspective view. The formwork anchor 10 is used for tensile strength joining of formwork elements, for example in the manufacture of reinforced concrete walls, in which two standing formwork elements are joined together to give a defined wall thickness. The formwork anchor 10 has a first anchoring portion 5, which is formed by a prestressing steel rod in the present embodiment. Such known prestressing steel bars have a ribbing or a coarse thread, by means of which the first anchoring section 5 can be anchored by screwing in on a first formwork element. However, the first anchoring portion 5 can also be anchored in other ways to the respective formwork element, for example by means of a bayonet closure or the like.

On its opposite side of the formwork anchor 10 has a second anchoring portion 3, which will be explained in more detail below. In the present embodiment, between the first anchoring section 5 and the second anchoring section 3, the formwork anchor 10 has a double conical section 2 which has a first conical section 2 'and a second conical section 2 ". which is located closer to the second anchoring portion 3, less than the opening angle of the conical portion 2 '. It should also be noted that the conical section 2 may also be conical in sections only, and may also have a smaller or larger number of conical areas. In this case, the surfaces of the conical sections 2 ', 2 "are chromed in the present embodiment.

Furthermore, the at least partially conical section 2 in the present embodiment is formed integrally with the second anchoring section 3, for example as a rotated component, and the prestressing steel bar 5 is pressed with the conical section 2 and second anchoring section 3 in the region of a compressed section 12. It should be noted, however, that the formwork anchor 10 may also be constructed completely in one piece or by a larger number of parts.

The second anchoring section 3 is rod-shaped in the present embodiment, ie without thread or the like. Rather, in the present embodiment, the second anchoring portion 3 has a plurality of through holes 7 extending in the longitudinal direction of the second anchoring portion 3 (from left to right in FIG Fig. 1 ) are spaced and extend in the present embodiment perpendicular to the axis of the formwork anchor 10. In addition, the second anchoring portion has a scale in Shape of ring marks, which are spaced in the longitudinal direction of the second anchoring portion 3 and allow an accurate adjustment of the respective wall thickness.

Finally, the second anchoring section 3 has at its free end (on the right in FIG Fig. 1 ) Load application means in the form of a hexagonal section, so that here, for example, a socket wrench or open-end wrench can be placed to release the formwork anchor 10 after a concreting process from the concrete.

Furthermore, the formwork anchor 10 according to the invention comprises an anchoring element, which is formed in the present embodiment by a stop disc 1 and a sleeve 4. The stop disc 1 and the sleeve 4 are attachable to the second anchoring portion 3 and freely slidable in the longitudinal direction, i. There is a certain play between the inner peripheral surfaces of the stopper disk 1 and the sleeve 4 and the outer peripheral surface of the second anchoring portion. 3

In the present embodiment, the sleeve 4 has a plurality of passage openings 8, which in the present embodiment extend completely through the sleeve 4 perpendicular to the longitudinal axis of the shuttering anchor 10. However, it should be noted that the sleeve 4 may also have through holes that penetrate only once the side wall of the sleeve 4. Here are, as in Fig. 2 is best seen, each arranged a plurality of through holes 8 in positions which are offset in the longitudinal direction of the second anchoring portion 3.

By means of the passage opening 7 of the second anchoring section 3 and the passage openings 8 of the anchoring element 1, 4, the anchoring element 1, 4 safely with respect to the second anchoring portion. 3 be fixed. This is done in the present embodiment by a screw 9, which is passed through the through holes 7, 8 and secured at its free end with a nut 9 ', although instead of the screw, other means such as bolts or the like can be used.

Another special feature of the anchoring element 1, 4 is that the stop disc 1 and the sleeve 4 need not necessarily be integral, but optionally may be configured as separate components, so that the sleeve 4 is detachable from the stopper disc 1. After loosening the sleeve 4, this can either be connected to the stop disc 1 again in the same position. Alternatively, it is also possible to rotate the sleeve 4 and to connect with its opposite end to the stop plate 1. For this purpose, as in Fig. 2 it can best be seen, on the stop disc 1 engaging projections 1 'may be provided which can engage with provided in the sleeve 4 grooves 4' in engagement. As a result, an even greater variability of the setting positions of the anchoring element 1, 4 with respect to the second anchoring section 3 can be achieved.

The use of the formwork anchor 10 according to the invention in the manufacture of a reinforced concrete wall relates, for example, as follows. Thanks to the scaling provided on the second anchoring section 3, the anchoring element 1, 4 can already be brought into a desired position (and thus wall thickness) with respect to the second anchoring section 3, the position of the stop disc 1 indicating the wall thickness to be produced at the scale. Subsequently, the screw 9 is passed through the openings 7, 8 of the sleeve 4 and the second anchoring portion 3 and secured at its free end as needed with the nut 9 '. Now, the shuttering anchor 10 by a designated opening in a formwork element (not shown), and then the thread of the first anchoring portion 5 is completely screwed into a provided on an opposite formwork element internal thread. In this fully screwed-in position, the formwork anchor 10 produces a tension-proof connection between the formwork elements such that the desired spacing and thus the desired wall thickness are determined between the formwork elements.

Now, the wall can be concreted, wherein the at least partially conical section 2 can come into direct contact with the concrete. Once the concrete has reached a sufficient strength for stripping, the formwork anchor 10 can be solved, for example, by attacking with a suitable tool on the hexagon 11 and the thread of the first anchoring portion 5 is rotated out of the internal thread of the corresponding formwork element. In this case, the shuttering anchor 10 can be solved easily thanks to the at least partially conical design of the section located in the concrete 2, and the shuttering anchor 10 can then be completely removed.

In this configuration, the formwork anchors can be stored or used directly for the next scarfing process, with no change in the wall anchorage thickness must be made on the formwork anchor 10, whereby the construction process is accelerated and error sources are minimized.

Claims (7)

1. Shuttering anchor (10) for tension-proof connection of shuttering elements, having:

   a first anchoring section (5), which can be anchored on a first shuttering element,

   a section (2) which is conical at least in some sections,

   a second anchoring section (3), wherein the section (2) which is conical at least in some sections is provided between the first anchoring section (5) and the second anchoring section (3), and

   an anchoring section (1, 4) which is provided to be brought into a certain anchoring position on the second anchoring section (3),

   wherein

   the anchoring element (1, 4) can be displaced freely in its longitudinal direction with reference to the second anchoring section (3) and can be fixed in its longitudinal direction via engagement means with reference to the second anchoring section (3),

   wherein the engagement means comprise at least one opening (7), in particular passage opening in the second anchoring section (3), and

   the engagement means have at least one locking element (9),

   characterised in that the engagement means have at least two openings (8) in the anchoring element (1, 4) which are arranged to be offset in the longitudinal direction of the second anchoring section (3), wherein

   the locking element (9) can be introduced into the at least one opening (7) of the second anchoring section (3) and/or an opening (8) of the anchoring element (1, 4).
2. Shuttering anchor according to claim 1, characterised in that the anchoring element (1, 4) is designed to have many parts, wherein at least one part (4) of the anchoring element can be released from the remaining part(s) (1) and can be joined again in a different configuration.
3. Shuttering anchor according to one of the preceding claims, characterised in that the section (2) which is conical at least in some sections is designed to have several cones.
4. Shuttering anchor according to one of the preceding claims, characterised in that the second anchoring section (3) has markings, in particular a scale.
5. Shuttering anchor according to one of the preceding claims, characterised in that the second anchoring section (3) has load-application means (11) for release of the shuttering anchor from the concrete.
6. Shuttering anchor according to one of the preceding claims, characterised in that the second anchoring section (3) and the section (2) which is conical at least in some sections are designed to be integral, and in that the first anchoring section (5) is connected to the latter, in particular pressed.
7. Shuttering anchor according to one of the preceding claims, characterised in that it is coated, in particular chrome-plated, at least in some sections, wherein the coating is preferably provided in the region of the section which is conical at least in some sections.

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