EP1596015B1 - Device for lifting concrete components - Google Patents

Abstract

The device (V) for the fixing and lifting of especially prefabricated reinforced concrete components has a protective box (2) and at least one flexible rope element (S) passing through the box and which has a rope loop (3) and end anchor (4). The rope loop and/or the end anchor of the flexible rope element assumes at least in sections an angle of between 0 and 45 degrees in relation to the base (2') of the protective box, and may be between 5 and 25 degrees.. An independent claim is included for a concrete component, and especially a prefabricated reinforced concrete component.

Description

Technical area

The present invention relates to a device for striking and lifting concrete parts, in particular precast reinforced concrete parts, according to the preamble of claim 1.

State of the art

For striking and lifting concrete parts usually transport anchors are used in the art, which are embedded in the concrete part and then serve as a point of attack for a crane hook or the like. Conventional transport anchors have a head which is provided with an internal thread, which is accessible in the concreted state of the transport anchor from the concrete surface. In the internal thread is then screwed on the construction site provided with an external thread crane loop, in turn, a crane hook can be hung (struck). Other known transport anchors are for example in the DE 295 13 732 U1 or the DE 35 41 262 A1 disclosed.

However, the known lifting anchors have a number of disadvantages. So it often comes in the field of thread contamination, especially by concrete, which makes screwing a crane loop considerably difficult or even impossible. In addition, there is a risk that crane loops are screwed into the internal thread, not on the lifting anchor or the weight of the concrete part which significantly affects occupational safety. In addition, the crane loops that are loose on the construction site are often lost and easily confused. Last but not least, the known transport anchors are difficult to fix when producing the concrete part to a formwork.

Furthermore, transport anchors are known with forged head. This head can be accessed with an additional load-carrying means with a claw-like holding device. Furthermore, stamped transport anchors made of flat material are known, which have a cross-section in the head area, in which one engages with a load-carrying means with a corresponding cross pin. In addition, vertical concreted and protruding rope loops are known to which you can strike directly with a hook. The same system of rope loops are also available in a recess, for which you then again as a load-carrying means a particularly flat-built hook needed to reach under the rope loop.

All these transport anchor systems have in common that you need an expensive and repeatedly used load handling equipment, which is an economic disadvantage or the protruding cable loop must disconnect them after transport or it remains on the component, which is a visual impairment.

In addition, there are a variety of other inserts in construction. For non-positive connection of concrete parts are often connecting elements with a storage box for receiving one or more loops used. So is in the CH 688 239 A5 a storage box with folded reinforcing steel shown, which projects at right angles from the bottom of the box. In the DE 3 127 087 A1 are also shown several bent reinforcing steel elements, in which the straight element is in the storage box and a loop orthogonal as a final anchor protrudes to the bottom of the box on the concrete side. Also the DE 4 109 706 A1 shows such a storage box with bent reinforcing steel and right-angled loop as end anchor. Also in the DE-OS 1 684 254 a storage element is shown, which includes a loop which is folded folded substantially at right angles to the end anchor and in the unfolded state is substantially vertical to the storage box floor. All these described storage boxes it is peculiar to take rigid reinforcing bars or flexible wire rope elements in the caddy and at the end to have an end anchor substantially perpendicular to the caddy bottom. The purpose of these elements is in each case the connection of concreting sections with each other. Further examples of such storage boxes are in EP 0 534 474 . EP 0 819 203 and EP 0 914 531 disclosed.

All the above-mentioned storage boxes have in common that their main task is to include flexible reinforcing loops in the form of wire ropes that can be folded out after the concreting process to connect the concrete components by juxtaposing and overlapping the rope loops frictionally and permanently. The main direction of action of the connecting cable loop is thus in the final state orthogonal to the bottom of the storage box. Accordingly, the anchoring ends protrude in the relaxed state concrete side perpendicular to the bottom of the storage box into the concrete. Likewise, the direction of use of the folded during concreting and later relaxed protruding loop perpendicular to the box longitudinal direction and the box bottom. For this reason, this Verwahrkästen common to all that holding elements and devices must be present, which forces the cable loop elastically deforming in part with considerable restoring forces in the retracted position. Only when unfolding can this again take a restraint-free, relaxed position.

The known fasteners with storage boxes therefore require expensive tools that the cable loop before their use, d. H. during setting in concrete and transport, against whose restoring force elastically deforming hold within the storage box. For this purpose, for example, the storage box is provided with elaborate retaining elements, which makes the construction of the connecting element but a total of consuming.

Further, the DE 297 23 990 U1 a device according to the preamble of claim 1.

Presentation of the invention

It is therefore an object of the present invention to provide a device for lifting concrete parts of the type mentioned, which offers a simplified construction and increased safety.

This object is achieved by a device for striking and lifting concrete parts with the features of claim 1. Advantageous developments of the invention are specified in the dependent claims.

The present invention is based on the idea to design a einzubetonierende device for striking and lifting concrete parts such that they can be hung without further means or measures directly to a hook, crane hook or the like. For this purpose, the invention provides that a device known per se as a connecting element for structures with a storage box and a flexible cable element is designed such that it is suitable as a lifting device. In the embodiment according to the invention, the loop and / or the end anchor of the at least one flexible cable element assumes at least in sections an angle between 0 and 45 ° with respect to the storage box floor.

In this case, this angle refers to the relaxed or unloaded state of the loop or the end anchor, in in which the flexible cable element penetrates the storage box without the flexible cable element being deformed or deflected by holding elements or the like. Furthermore, the terms rope loop and end anchorage describe those sections of the flexible cable element which are located on different sides of the storage box or floor box, wherein the end anchorage is intended to come to rest in the installed state in the concrete.

With the device according to the invention it is possible that no special elements must be provided which deform the flexible cable element for transport, storage or installation purposes and in a certain position, for example, within the storage box hold. Rather, the flexible cable element is already provided from the outset so that a folding of the loop with an almost negligible angle relative to the Endverankerungsauslauf is to accomplish so that, for example, a molding on the floor box only the sealing, but not the elastic forming of the wire rope loop must serve.

In addition, the flexible cable element according to the invention is already from the outset in an orientation in which act when lifting and lifting the concrete part containing the device, the highest lifting forces. As a result, harmful kinks, tilting and the like are avoided along the cable element, which increases the safety and durability of the device according to the invention. At the same time, there must be less force deflection in the concrete. Against this background, the device according to the invention is also suitable for narrow or thin-walled or hollow components.

Not least, the work safety is increased by the device according to the invention, since the possibility of a incorrect attachment to crane hooks or the like or incorrect attachment of connectors, which is required in the prior art, is eliminated.

According to one embodiment of the invention, it is provided that the cable loop and / or the end anchor at least partially occupies an angle between 5 and 25 ° relative to the storage box floor, whereby the above-mentioned advantages set even more pronounced.

The ends of the at least one cable element are connected to each other in the region of the end anchor, preferably by a steel press clamp. As a result, not only a stable and tensile rope element is created, but the end connection of the rope element in the region of the end anchor also allows an improved anchoring or carrying behavior of the end anchor.

Although the storage box may take a variety of forms depending on the application, it is preferred according to a development of the invention that the storage box is an elongated body for receiving the at least one cable loop. It has proven to be advantageous in terms of a secure receiving the cable loop that the storage box is a longitudinal profile in C or U-shape. These forms make it particularly easy to hook in a crane hook or the like without considerable deflection of the cable loop, which accelerates the work process and increases safety.

In order to ensure a good position assurance and trouble-free sealing of the device according to the invention during concreting, it is provided according to a development of the invention that the at least one flexible cable element penetrates the floor box in the region of an opening, which is preferably sealed by a molded part.

According to a further aspect, the present invention further provides a fastening element by means of which the device can be attached to rod-shaped elements such as reinforcing bars or the like. As a result, the device according to the invention need not be attached exclusively to a formwork section, but can be mounted on a formwork at a desired location even before setting up a formwork or before applying a reinforcing basket, without hindering the further production process. It is particularly preferred that the fastening element is designed such that the device can be suspended from rod-shaped elements, whereby the production process is further simplified.

Although the fastener may have any shape and be made of any material, it is preferred according to a development of the invention that the fastener consists of a bent wire part, a sheet metal part or a plastic part and / or has an at least partially curved shape.

Depending on the application, the fastening element can be formed integrally with the storage box or it can also be a separate element from it. In the latter case, it is provided according to a development of the invention that at least one receptacle for attaching a fastener is provided on the storage box. This makes it possible that the device according to the invention can be combined depending on the application with a custom-made fastener without the device must be changed every time. It is particularly preferred that the at least one receptacle is formed by an opening, depression, indentation and / or bending out in the storage box.

In order to enable picking up and bending out of the at least one cable loop in the storage box or out of it, according to a development of the invention, the storage box has an opening on its side opposite the storage box floor. In this case, it is further provided that the opening is closed by a removable cover, so that the cable loop is protected until its use and moreover does not protrude undesirably from the storage box. Here, in the context of the present invention, a comparatively thin-walled cover can be used, since the flexible cable element only has to be deformed by a small amount from its relaxed position into the position accommodated within the storage box. Furthermore, it has proven to be a simple and reliable solution to form the removable cover as a self-adhesive film.

Even in the presence of the above-mentioned fastener, it may be useful to attach the storage box additionally or exclusively to a formwork. For this purpose, the storage box according to an embodiment of the invention comprises at least one nail hole. It is particularly preferred that at least two nail holes are provided to prevent twisting of the storage box in the attached state.

Although the device according to the invention can be installed in any way in a concrete component, according to a development of the present invention, a concrete component, in particular a precast reinforced concrete part, provided in which the device according to the invention is installed such that the cable loop and / or the end anchor at least partially to the adjacent component surface an angle between 0 and 45 ° preferably between 5 and 25 ° occupies.

Brief description of the drawings

Fig. 1a

shows a schematic perspective view of a first embodiment of the device according to the invention;

Fig. 1b

shows a schematic perspective view of in Fig. 1a shown device in conjunction with a fastener;

Fig. 1c

shows a schematic perspective view of in Fig. 1b shown device in conjunction with a partially opened cover;

Fig. 2

schematically shows the attachment of the device Fig. 1a on a formwork section;

Fig. 3

shows schematically the attachment of a device according to the invention on a rod-shaped element;

Fig. 4

shows schematically a further embodiment of the device according to the invention;

Fig. 5

shows a schematic side view of the installation of the device according to the invention in a precast concrete part with lateral formwork;

Fig. 6

shows a schematic side view of the striking and lifting of a precast concrete after stripping by means of the device according to the invention;

Fig. 7

shows a schematic, partially cutaway view of the installation of the device according to the invention in a curved, thin-walled precast concrete part.

Detailed description of preferred embodiments

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

Fig. 1a shows a schematic perspective view of a first embodiment of the device V according to the invention, which is intended to be embedded in a concrete component 1 and to serve in the cured state of the concrete for striking and lifting the concrete component 1.

The device V according to the invention comprises a storage box 2 and, in the present embodiment, a flexible cable element S, which penetrates the storage box in the region of an opening 7. The flexible cable element S has a cable loop 3 and on the opposite side of the opening 7 and the deposit box bottom 2 'a so-called end anchor 4 in the form of two end portions of the cable element, which are interconnected at their ends by means of a steel press clamp 11 or the like.

The flexible cable element may be, for example, a wire cable section, the present invention not being limited to this and other flexible support elements may also be used. Thanks to its flexibility, the flexible cable loop 3 can be deflected by hand relative to the storage box 2 and can also be received within a cavity formed by the storage box 2. In Fig. 1a the flexible cable element S is shown in a relaxed, ie unloaded state, in which, apart from possible deflecting forces in the area of the passage opening 7 and the dead weight, no external forces act on the flexible cable element S. In this condition The cable loop 3 and the end anchor 4 of the flexible cable element S each have an angle in the range between 5 and 25 ° relative to the trolley bottom 2 'a.

The storage box 2 is preferably made of robust sheet steel in one piece and formed as an elongated body, in the interior of the cable loop 3 can be accommodated. It has proved to be advantageous to form the storage box 2 in the longitudinal profile in C or U-shape. In the region of the opening 7 of the deposit box bottom 2 ', a molded part 8 can be provided in order to prevent the penetration or escape of concrete or sludge. The ends of the storage box 2 are preferably formed from bent sheet metal and folded over so that they close the storage box 2 solid as the end cover 19.

A development of the embodiment Fig. 1a is in Fig. 1b shown in a schematic perspective view. The embodiment in Fig. 1b additionally comprises a fastening element 13, by means of which the device can be attached to rod-shaped elements such as reinforcing bars or the like. Although the fastener 13 may be formed integrally with the storage box 2, in the present embodiment it is a separate component mounted in receptacles 12 and the side walls of the storage box 2. The receptacles 12 of the custody box 2 may be openings, recesses, indentations and / or deflections, which allow easy attachment and possibly also release of the fastener 13. The fastener 13 may take a variety of forms, but is preferably configured so that it can be easily hung on a rod-shaped element. Advantageous embodiments of the fastener 13 are for example a wire bending part, a sheet metal part or a plastic part, wherein it is preferred in terms of hanging that the Fastening element 13 has an at least partially curved shape.

A further embodiment of the device according to the invention is shown in a schematic perspective view in FIG Fig. 1c shown. In the Fig. 1c shown device V corresponds to the embodiment of Fig. 1b , which is additionally provided with a removable cover 18 which closes an opening 9 of the storage box 2 opposite the storage box floor 2 'of the storage box 2. The cover 18 is preferably made of a self-adhesive film and ensures that during a concreting process no concrete or seepage penetrates into the interior of the storage box 2. The Fig. 1c shows the cover 18 in a partially opened state.

Although the device V according to the present invention is preferably combined with at least one fastening element, the device V or the storage box 2 can also alternatively or additionally be attached directly to a formwork section 15, as in FIG Fig. 2 shown schematically. In the Fig. 2 shown embodiment of the device V for this purpose comprises two nail holes 17 through which nails 16 can be hammered into a formwork section 15 to attach the storage box 2 itself to this. The nail holes are also in Fig. 3 shown.

Further embodiments of the device V according to the invention are shown in FIG Fig. 3 and 4 shown in schematic views. The embodiment in Fig. 3 is characterized in that the fastening element 13 is formed in the form of a short, curved hook made of flat material, by means of which the device V can be easily hung on a rod 14. The alternative embodiment according to Fig. 4 is characterized by fasteners 13 made of a flat material, which need not be bent, but in which the Einhängfunktion by recesses 13 'is achieved, in which a rod-shaped element can easily engage.

The installation of the device V according to the invention in a prefabricated reinforced concrete element 1 still in the formwork 15 is shown in FIG Fig. 5 shown in a schematic side view. In this case, the cable loop 3 is located within the storage box 2, so that it does not interfere with the production of the precast concrete part 1 within the formwork sections 15. The collapse of the cable loop 3 in the interior of the storage box 2 can be done in any way, for example by means of a film cover, by means of lateral support elements or by simply applying the storage box 2 to the formwork section 15. The advantage here is that the cable loop 3 of her in Fig. 1a shown, relaxed state only slightly deflected to get into the interior of the storage box 2.

The end anchor 4 of the flexible cable element S in the installed state, however, has its already in Fig. 1a shown alignment and stands at an angle between 0 and 45 °, preferably between 5 and 25 ° relative to the storage box bottom 2 'on the concrete side 6. As in Fig. 5 can be seen, this flat angle of Endankers 4 even in thin or slender components has the advantage that the press clamp 11 is not applied to the opposite formwork section 15, but freely within the reinforced concrete precast element 1 comes to rest, so that with the device according to the invention V can also produce very narrow or slender components without any problems and without undesirable disturbances on the component surface or deformations of the end anchor 4.

The use of the device V according to the invention for lifting the in Fig. 5 shown prefabricated concrete part 1 is in Fig. 6 shown schematically. For this purpose, first an optionally present cover 18 is removed from the storage box 2, whereupon the cable loop 3, if it is not held by further holding elements, in the in Fig. 1 shown, relaxed state comes out of the interior of the storage box 2. The device V is thus already ready to hook or hang a crane hook 20. This must, as in Fig. 6 shown, now only fed and attached. In this case, the tip of the crane hook can penetrate into the interior of the storage box 2, which considerably facilitates the hooking of the crane hook 20 into the cable loop 3 and avoids sources of error. As based on Fig. 6 becomes clear, are cable loop 3 and end anchor 4 in a direction in which also a large part of the lifting force of the crane hook 20 acts, which favorably influences the lifting behavior during lifting and allows even thin or slender or hollow components safely with the device according to the invention can be raised.

An example of a frequently encountered hollow concrete component is in Fig. 7 shown schematically. This is a tube section 1, in whose curved outer wall the device V according to the invention is suspended by means of a fastening element 13. Such tubular components 1 often have a very small wall thickness, so that the use of known stop means is usually difficult, while the device V according to the invention enables a safe and trouble-free lifting of the component 1. The attachment of the device in the net-like prefabricated rod-shaped reinforcement using the fastening device 13 allows the preferred use of steel formwork to which one can not nail.

List of reference numbers

1

Precast concrete

2

storage box

2 '

storage box

3

wire loop

4

Rope anchors, end anchors

5

formwork side

6

concrete side

7

Breakthrough, penetration at the deposit box

8th

molding

9

Opening the storage box

10

Holding means or flanges

11

ferrule

12

retaining elements

13

fastening device

14

reinforcement

15

formwork

16

nail hole

17

nail

18

Cover the opening

19

end cover

20

crane hook

δ

Angle end anchor to storage box floor level

V

contraption

S

cable element

Claims (16)

1. Device (V) for attaching and lifting concrete units, in particular precast reinforced concrete units (1), having a protective box (2) and at least one flexible cable element (S) which passes through the protective box (2) and which has a cable loop (3) and an end anchor (4), wherein the cable loop (3) can be at least partially held in the protective box (2) and taken out of it,
   characterised in that the cable loop (3) and/or the end anchor (4) of the at least one flexible cable element (S) in the slack or unstressed state in at least one section adopts an angle (δ) of between 0 and 45° to the bottom (2') of the protective box.
2. Device according to claim 1, characterised in that the cable loop (3) and/or the end anchor (4) of the at least one flexible cable element (S) in at least one section adopts an angle (δ) of between 5 and 25° to the bottom (2') of the protective box.
3. Device according to claim 1 or 2, characterised in that the ends of the at least one cable element (S) are connected to each other in the region of the end anchor (4), preferably by a steel ferrule (9).
4. Device according to any of the preceding claims, characterised in that the protective box (2) is an elongate body for holding the at least one cable loop (3).
5. Device according to any of the preceding claims, characterised in that the protective box (2) presents a longitudinal profile in a C or U shape.
6. Device according to any of the preceding claims, characterised in that the at least one flexible cable element (S) passes through the bottom (2') of the protective box in the region of an aperture (7) which is sealed off by a moulded part (8).
7. Device according to any of the preceding claims, characterised in that it further has a fastening element (13) by means of which the device can be attached to, in particular suspended from, rod-shaped elements such as reinforcing rods or the like.
8. Device according to claim 7, characterised in that the fastening element (13) consists of a bent wire part, a sheet metal part or a plastic part and/or has a shape which in at least one section is curved.
9. Device according to any of the preceding claims, characterised in that on the protective box (2) is provided at least one receptacle (12), in particular an opening, depression, indentation and/or protrusion, for attaching a fastening element (13).
10. Device according to any of claims 7 to 9, characterised in that the fastening element (13) is constructed in one piece with the protective box (2).
11. Device according to any of the preceding claims, characterised in that the end faces of the protective box (2) are sealed off by end covers (19).
12. Device according to any of the preceding claims, characterised in that the end faces of the protective box (2) are obtained in one piece by bent-over portions (19).
13. Device according to any of the preceding claims, characterised in that the protective box (2) on its side opposite the bottom (2') of the protective box has an opening (9) which is closed by a removable cover (18).
14. Device according to claim 13, characterised in that the removable cover (18) is constructed as a self-adhesive foil.
15. Device according to any of the preceding claims, characterised in that the protective box (2) has at least one nail hole (16), preferably at least two nail holes, for fixing the protective box (2) to shuttering (15).
16. Concrete structural member, in particular precast reinforced concrete unit (1), having a device according to any of the preceding claims, characterised in that the cable loop (3) and/or the end anchor (4) of the at least one flexible cable element (S) in at least one section also adopts an angle (δ) of between 0 and 45°, preferably between 5 and 25°, to the adjoining surface of the structural member.

Images