DK2224075T3 - Storage device for angled cable loops and process for the production of concrete elements - Google Patents

Description

The present invention relates to the production of precast concrete parts and in particular a storage device for rope loops, comprising a storage box, which receives at least one clamping part and one eye of the rope loop, wherein the storage box comprises a bottom and side walls and wherein in the bottom of the storage box at least one opening for the passing through of free ends of the rope loop which protrude from the storage box and for receiving a portion of the clamping part is provided, wherein the storage box, apart from a bottom opening for passing through of the free ends of the rope loop, is in general completely closed and/or can be sealed with respect to a formwork, in order to avoid that the eye received in the storage box is encased by concrete. A large number of variations of such storage devices are already known from the state of the art.

For example, from DE 10 2006 057 134 A1 a rope loop box for receiving at least one rope loop is known, which comprises a base body with an in general rectangular base plate and four side wall sections, wherein at least one of the side wall sections forms an angle greater than 90° with the base plate.

These storage boxes with their rope loops received therein are used for the production of precast concrete parts, typically concrete walls, but also for supports and posts or column elements. A corresponding storage device together with the rope loop received therein is inserted at the edge of a formwork for a precast concrete part, with the result that the free ends of the rope loop which protrude at right angles from the storage box which receives the eye project into the inside of the space surrounded by the formwork and can be cast with concrete. The storage box is attached to the formwork with its open or closed top side inside and in addition, apart from a bottom opening for passing through of the free ends of the rope loop, is intended in general to be completely closed and sealed with respect to the formwork, in order to avoid that the eye received in the storage box is encased by concrete.

After the later removal of the outer formwork and optionally the opening of the storage device, the mostly angled eye which is received in the storage box is then folded out from the top side of the storage box which is open or to be opened and is opposite the free rope ends, as long as it does not already protrude from the storage box. The eye then serves to receive one or more reinforcement elements, together with corresponding eyes of adjacent precast parts, wherein the intermediate space between the adjacent precast parts in which the eyes and corresponding reinforcement elements are located is filled by a grouting mortar and thus produces a firm connection between the adjacent precast parts.

The present invention accordingly also relates to a method for the production and connection of precast concrete parts, wherein at least one storage box having at least one angled rope loop is attached to a partition wall of a formwork from the inside and is cast with concrete, wherein an eye of the rope loop received in the storage box protrudes or is folded out from a side of the storage box which is open towards an outer surface of the precast concrete part after hardening of the concrete and in order to connect adjacent precast concrete parts.

For connecting such precast concrete parts, at least one reinforcement element is then passed through the folded-out eye, wherein the intermediate space between adjacent precast concrete parts containing the eye and the reinforcement is then filled by a grouting mortar.

Instead of generally cuboid storage boxes which comprise at least one bottom and four circumferential side walls connected to each other, sometimes so-called “rails” or “storage rails” are also received in a formwork, which generally extend beyond the entire height of a precast part along the narrow side thereof and in which optionally the end side walls of the storage rail can be dispensed with if the rail finishes there with adjoining formwork elements. In particular, the end sides of the storage boxes (or optionally also of the rails) can also be formed by adhesive tape or sealing ends.

Such a storage rail thus essentially consists only of a bottom and two opposing parallel side walls, which are angled with respect to the bottom either at right angles or forming an obtuse angle, with the result that they approximately form a trapezoidal cross section. Storage boxes can also have an approximately trapezoidal cross section and in this respect deviate from the basic shape of a cuboid, but are, insofar as the corresponding angles of the trapezoid do not deviate too far from 90°, nevertheless regarded as “generally cuboidal” here.

The rope loop is generally fixed on the storage box by a separate “clamping part”, which serves primarily to seal the bottom opening through which the rope ends emerging from the eye are passed through and out of the storage box. The clamping part can also comprise one or more bending stops for angling the eye with respect to the free rope ends, insofar as these bending stops are not formed by the storage box or parts thereof or by the formwork covering the top side of the storage box. Such bending stops serve in part also as fixing elements for the rope loop on the storage box or the storage device purely by frictional engagement.

These rails or storage boxes are intended to remain in the precast parts permanently. In order that adjacent precast parts connected to each other form a bond with each other that is as firm and durable to loading as possible, the corresponding storage boxes and storage rails should enter into a bond that is as firm as possible with the adjoining concrete and the grouting mortar in the gap between adjacent precast concrete parts. For this reason, storage boxes and rails, or the surfaces thereof, are often intentionally designed such that they form a connection that is as firm as possible with the adjoining concrete and grouting mortar faces. For example, on the outer and inner surfaces, projections and recesses in the storage boxes can be provided, and these storage boxes or storage rails can also be produced from materials that adhere relatively well and firmly to concrete. The external geometry of the storage box, which is not only formed as a rectangular cuboid, but rather can also in part comprise side faces that are angled by more than 90° with respect to the bottom, can also be used to improve the fixing of the storage box on the concrete and the connection between grouting mortar and precast part, in that the grouting mortar fills undercuts that are formed by the correspondingly tilted side walls of the storage box (seen from the top side thereof).

All of these measures for improving the connection between the storage boxes or storage rails and the precast concrete parts in which the storage boxes or storage rails are involved, however, represent a considerable additional outlay. Moreover, the storage boxes and storage rails are non-recoverable parts which increase the costs for the precast concrete parts to be produced.

In WO 2008/090260 A1, a method and an apparatus for providing a reinforcement introduced into a concrete structure are described, wherein in the method a dowel-like countersink is provided in a concrete surface by means of a case-like structure. In the case-like structure there is arranged a cable sling, the first end of which is anchored to the cast concrete, wherein the second end is prevented from adhering to the concrete. The case-like structure is removed from the concrete structure after hardening of the concrete and the second end of the cable sling is straightened substantially perpendicular to the bottom surface of the dowel-like countersink.

Vis-å-vis this state of the art, the object of the present invention is to create storage devices and a method for the production of precast concrete parts which require a lower outlay and give rise to lower costs and nevertheless improve or at least do not impair the bond between adjacent precast concrete parts.

This object is achieved for the storage device in that, after fixing of the free ends of the rope loop, the storage box can be removed from the rope loop and from the clamping part possibly connected thereto, wherein the clamping part is formed as an angle bracket, which keeps a rope loop, which consists of an eye and two parallel free ends, in an angled condition, wherein the angle bracket comprises a base, which receives and fixes the eye partly, wherein the base comprises a circumferential sealing flange, which is attached to the outer side of the bottom of the storage box, and wherein locking means for a temporary fixing of the angle bracket to the storage box are provided at the base and/or at the sealing flange, wherein the locking means are in detachable engagement with the edge of the bottom opening, such that they can be disengaged by means of a well-defined force, which is applied to the storage box perpendicularly to the bottom and away from the concrete bed, and wherein the storage box consists of a sufficiently stable and solid material, such that it can be detached from a concrete bed surrounding the outer sides of the bottom and the side walls and from the angle bracket, without being damaged.

With respect to the method described at the beginning, the above object is achieved in that a storage box according to one of claims 1 to 14 is used, which is removed from the precast concrete part for subsequent reuse after the folding out of the eye.

For transporting, introducing into a formwork and fixing of the rope loop in the storage box such that the free ends of the rope loop are completely surrounded by the concrete poured into the formwork, the storage box and the clamping part (together with the rope loop) preferably form a unit. The storage box and its connection with the clamping part are expediently designed such that the storage box, after the casting of the rope loop ends with the concrete and the removal of the formwork, can at least be detached from the rope loops and preferably also from the clamping part; it can also be removed from the recess formed by the storage box in the concrete. Any connection between the storage box and the rope loop and/or clamping part is accordingly designed as a detachable connection.

In a preferred embodiment, the clamping part is formed as a so-called “angle bracket” which keeps a rope loop, which consists of an eye and two parallel free ends, in an angled condition, in which the rope ends extend approximately at right angles from the eye plane defined by the eye.

This makes it easier to apply and keep a rope loop on and in part in the storage device or in the storage box in a space-saving, angled condition of the eye.

For a simultaneous passing through of the rope ends which is sealed and a fixing on a storage box, the angle bracket could, for example, essentially have the shape of a truncated pyramid which can be inserted closely fitted into a correspondingly shaped bottom opening of a storage box from the underside. This gives the angle bracket in the opening of the storage box a firm positive-locking and frictionally engaged seating which, however, can be readily detached again by pulling the storage box off the angle bracket in a direction perpendicular to the bottom of the storage box.

In addition to such a positive-locking and frictionally engaged connection through fitting insertion of the angle bracket into a bottom opening, locking means could also be provided on the angle bracket or on the storage box which lock in corresponding openings or undercuts on the respective other part, but which can also be readily detached again. Any locking means should also not enter into positive-locking engagement by abrupt, mutual undercuts, but rather by an engagement of a projection, provided with inclined surfaces, into a corresponding depression or by only very short protrusions or undercuts, with the result that a detachment of the angle bracket and storage box is easily possible with a defined force that can preferably be readily applied by hand.

In a preferred embodiment of the storage device according to the invention, the storage box has essentially an elongated cuboid shape and consists of a material that is sufficiently stable, with the result that it can be detached from a concrete bed surrounding the outer side of the bottom and side walls without damage. In particular, the side walls and the bottom of the storage box should thus be designed such that no positive-locking connection is formed at all with the concrete, but rather at most a frictionally engaged connection which, as with any connections with locking means or the like on the angle bracket, can be detached readily, or with a well-defined force, such as can be applied readily by a user, if necessary with the aid of a simple hand tool, both from the concrete and from the angle bracket.

For easier application of a pull off or pull out force to the storage box, in order to detach it from the concrete bed and from the angle bracket, according to an embodiment of the invention it is provided that the top side of the storage box which is opposite the bottom is at least partially open, or comprises undercut recesses or that cams are provided on the side walls for applying a pull out force to the storage box in order to pull this out from a concrete bed.

For example, the top side could be partially closed or comprise individual cover elements or brackets that bridge the opposite side walls, or the top side of the storage box could be closed off completely, but comprise a depression with undercuts into which a simple hand tool can be introduced in order to then be able to apply an appropriate pulling force to the top side of the storage box and thus on the storage box as a whole in order to detach it from the concrete bed and from the angle bracket, which is likewise held in the concrete bed via the concreted-in free ends of the rope loop. In an embodiment, the two opposite longer side walls in each case comprise a cam projecting inwards, which can be gripped from behind with the fingers or a hook-shaped tool (for example a pick hammer) in order to pull the storage box out of the concrete bed and off the angle bracket(s).

In contrast to corresponding conventional storage devices, in a preferred embodiment of the present invention the outer surfaces of the storage box are to consist of a smooth material which adheres poorly to concrete. It would also be conceivable for the storage box to have a trapezoidal cross section or the shape of a truncated pyramid (with elongated rectangular cross section), with the result that the top side forms a somewhat larger surface area than the bottom of the storage box, which also makes a detachment from the concrete bed surrounding the side walls easier.

According to a further embodiment, the angle bracket could comprise a base which receives and fixes the eye partly, wherein the base comprises a circumferential sealing flange, which is attached to the outer side of the bottom of the storage box.

The base could accordingly, for example, have a cuboid shape or be cylindrical or of any polygonal cross section with side walls running essentially perpendicular to the bottom of the storage box, but it could also be in the shape of a truncated pyramid, in turn with any pyramidal cross section, with the result that it can be easily introduced into a bottom opening of the storage box with a somewhat tapered end, while a section with a larger cross section, which preferably adjoins directly on a circumferential sealing flange, sits closely fitting in the bottom opening of the storage box.

The sealing flange is, as already mentioned, preferably formed completely circumferential, even if this is not an absolute requirement if the base itself already sits tightly in the bottom opening of the storage box. In this case, the “sealing flange” essentially serves only as a defined end stop when the angle bracket is inserted into the bottom opening of the storage box.

However, the sealing flange can also additionally or solely have a sealing function and, as already mentioned, in this case is preferably formed circumferential and it can also be formed slightly tapered at its outer edge in the form of a sealing lip, and in particular the outer, circumferential flange edge can be slightly tilted towards the base, with the result that the base with the flange cross section approximately has the shape of a “mushroom cap”. Through this, when the base is inserted into the bottom opening, the flange first comes into a sealing engagement with the outer side of the bottom of the storage box, wherein by further, complete insertion of the base into the bottom opening, the outer flange edge becomes elastically bent upwards and thereby is attached on the bottom of the storage box in a well-sealing manner with a certain pretensioning.

In a preferred variation, however, the sealing flange, for its part, has the shape of a truncated pyramid, i.e. its circumferential surface is clearly bevelled (e.g. by 30° to 50° relative to the plane of the flange), wherein the lower edge of the corresponding bottom opening of the storage box is bevelled in the same way (or at a slightly steeper angle), with the result that the sealing flange fits into the bevelled bottom opening in the manner of a sealing cone.

The sealing flange should have a protrusion of at least 5 mm with respect to the base, i.e. the sealing flange should be at least 5 mm wide around the circumference.

On the top side of the sealing flange, which faces the inside of the storage box, clamping brackets or locking means can be provided, which engage with the edge of the bottom opening and hold the angle bracket, in any case temporarily and for the period of the transport, handling and installation into a formwork, including the casting with concrete, sufficiently securely and in sealed attachment on the storage box. This locking or clamping connection should, however, also be able to be detached without problems in order that it is possible to pull off the storage box from the angle bracket without damage and without a large effort, after its parts which project into the concrete bed and the free ends of the rope loop held by the angle bracket are concreted in. These locking means therefore form a detachable engagement with the edge of the bottom opening, i.e. any locking projections only have a short protrusion or are attached on the edge of the bottom opening with inclined surfaces, such that they can be disengaged by means of a well-defined force, which is applied to the storage box perpendicularly to the bottom and away from the concrete bed.

The locking means for a temporary fixing of the angle bracket could be provided either on the base or on the sealing flange. According to a preferred embodiment of the invention, the storage box is designed as a reusable storage box, i.e. it consists of a sufficiently stable and solid material, such that it survives the pulling-out from a concrete bed and the pulling-off from the angle bracket as a rule without damage and later can be equipped again with a new angle bracket and a rope loop received therein, while the rope loop received in the storage box previously and the corresponding angle bracket remain in the precast concrete part produced using the storage device.

It is understood that the storage box is accordingly to also consist of a material which is resistant to weather effects and fluid concrete, in particular of an appropriate plastic material. In addition, however, aluminium or a combination of different materials including aluminium or galvanized sheet steel are also suitable as material for a corresponding storage box. As a rule, however, the angle bracket consists of steel or is a plastic part produced by injection moulding. Moreover, in one embodiment of the invention the storage box has, on its top side opposite the bottom, connecting devices for the connection to a formwork. These connecting devices can take on very different forms. For example, the side walls of the storage box could comprise flanges which are turned outwards, which for their part comprise nail holes or screw holes or the like, with the result that the storage box in this way can be nailed onto a formwork and, when the formwork is detached, in this way the storage box is detached together with the formwork from the precast concrete part.

Preferred, however, are connecting devices in the form of magnets, which are arranged close to the ends or at the lateral edges of the storage box, wherein in such a case, of course, the formwork must also consist of a magnetizable metal or comprise a magnetizable metal at appropriate positions. Expediently, corresponding storage boxes with magnets are used in conjunction with metal plate formworks or metal rail formworks, wherein metallic rails at least form the end side, or narrow side, lip of precast concrete parts or concrete slabs.

The magnets can be received in chambers or end portions close to the end sides of the elongated cuboid storage boxes. The top side of the storage boxes or of the chambers receiving the magnets should be partially closed at least in the region of the end portions comprising the magnets, in order to surround the upper edge of the magnets and keep the magnets in the storage box. Alternatively, however, the magnets can also have a shape such that they are kept in the chambers in a positive-locking manner.

According to a further preferred embodiment of the invention, a corresponding storage box comprises two openings for passing through of the free ends of two rope loops which can commonly be received in the storage box. A variation in which the angle brackets are arranged mirror-imaged in the two openings in such a way that the two eyes overlap each other saves space and material.

When the storage device is formed as a longer rail, in general more than 2 openings are provided in the bottom of the rail, in which the rope loops in each case are received in the same or in alternating orientation of the eyes.

Further advantages, features and applications of the present invention arise from the following description of preferred embodiments and the associated figures. There are shown in:

Figure 1 a perspective view of a storage box with two rope loops received therein and corresponding angle brackets,

Figure 2 a perspective view of the storage box without rope loops and angle brackets,

Figure 3 an angle bracket with an angled rope loop without storage box,

Figure 4 the storage box according to Figure 1 inserted into a formwork,

Figure 5 a finished concrete wall with concreted-in rope loops and removed storage box, and

Figure 6 sectional views of different variations of angle brackets.

Figure 1 shows the storage device, labelled as a whole with 100, which consists of a storage box 10, two angle brackets 30 inserted into the storage box 10 and rope loops 20 angled and kept in each of the two angle brackets 30, one in each.

The storage box 10 approximately has the shape of an elongated, flat cuboid, but with slightly tilted side faces 12, 13, with the result that the top side 14 of the storage box 10 as a whole defines a somewhat larger area than the opposite bottom. The shape of the storage box could therefore also be described as a truncated pyramid with an elongated-rectangular outline. The incline of the side walls 12, 13 with respect to the plane of the bottom 11 and/or the top side 14 in the embodiment shown is of the order of between 75 and 85°.

Without specific measurement indications currently being connected to a limitation intention, it should nevertheless be mentioned that the typical width of such a storage box can vary between 50 and 80 mm, whereas the length varies within larger ranges. In the present example, a storage box 10 is provided for two rope loops 20, which are angled with respect to each other and overlap alternately when received in the storage box 10. The overall length of an angled eye 21 is typically of the order of between 80 and 150 mm, with the result that the two rope loops 20 together with the associated angle brackets 30 in total take up an area of the bottom 11 that can have an extent, measured in the longitudinal direction, between at least 120 and up to 250 or 300 mm or even more.

In addition, a chamber separated by a bar or a separating wall 19 is also provided here on each of the end sides of the storage box 10, which e.g. serves to receive a magnet 18 or another fastening device, with the result that the storage box with the rope loops 20 received therein can be fastened to a formwork 40 (see Figure 4) in a manner which is as simple and rapid as possible.

Further details of the storage box can be seen in Figure 2, which, in part figures a and b, shows the storage box in two different perspective views.

In Figure 2a the storage box can be seen in a perspective view at an angle onto the bottom 11 of the storage box, while in Figure 2b the storage box 10 is shown in a perspective view at an angle onto its open top side 14.

It can be seen that the storage box 10 approximately has the shape of an elongated cuboid, wherein, however, the side walls 12, 13, starting from the bottom 11, are slightly tilted outwards, typically by 5 to 15° with respect to a perpendicular to the bottom, with the result that both in a longitudinal section and in a cross section in each case a trapezoidal outer cross section of the storage box 10 results perpendicular to the plane of the bottom 11 and the top side 14. This becomes clear in particular with reference to Figure 6. As the storage box is provided for multiple reuse, in the embodiment represented here it is either produced from steel or from another, stable material or e.g. is formed as a relatively solid part injection-moulded from plastic. The storage box 10 represented here comprises two bottom openings 15, wherein the lower outer edge of the bottom openings 15 is bevelled and wherein in addition the corner regions of the otherwise essentially rectangular bottom openings 15 are clearly rounded off. The inclined surfaces 16 provide a secure sealing with a corresponding “sealing cone” of a sealing flange 32, provided on an angle bracket, which will be described later in more detail. The term “sealing cone” here is also used for an element which is essentially rectangular in cross section, as the engagement of the inclined surfaces of the “sealing cone” 36 with the inclined surfaces of the bottom opening 15 has a similar sealing effect as with a cone with a circular cross section.

In Figure 2b the essentially open top side 14 of the storage box 10 can be seen, wherein approximately in the middle of the side walls 12 two opposite pull out cams 17 projecting inwards can also be seen. These pull out cams serve for pulling the storage box 10 out of a concrete bed with the help of a, for example, hook-shaped auxiliary tool, after the eyes 21 have been detached from the holding-down clamps 35 and folded out into a position as is ultimately also represented in Figure 5. It will often be possible to pull the storage box 10 out from the corresponding recess in the concrete simply by gripping the cams 17 from behind with the fingers of a hand. If necessary, however, a corresponding auxiliary tool can also be used which grips the cams from behind.

At the narrow ends of the storage box 10, two chambers can also be seen, which are filled by magnetic blocks 18. The magnetic blocks 18 can be cast with the storage box 10, but they can also be inserted and fixed retrospectively into corresponding chambers which have been provided at corresponding positions at the ends of the storage box 10. These chambers are separated from the cavity of the storage box which receives the angle brackets 30 and the eyes 21 by a separating wall or a separating bar 19. Expediently, the magnets 18 are fixed into the corresponding chambers of the storage box such that they just finish flush with the top side 14 or are set back inwards slightly with respect to the top side 14 and only come into contact with the plate 40 concerned when a magnetic object, such as e.g. a formwork plate 40 made of metal, is applied, through the effect of the relatively strong magnetic pull accompanied by slight elastic deformation of the upper edge of the chambers, with the result that the entire circumferential edge of the top side 14 of the storage box 10 is pressed tightly onto the formwork plate 40. In this way, it is possible to dispense with a covering of the open top side 14 in order that during the casting of a corresponding precast concrete part, in the formwork of which the storage box with the rope loops 20 is received, concrete is prevented from penetrating through the open top side 14 into the storage box, as the tight application of the edge of the top side 14 is already sufficient for this. The magnets could, of course, also be arranged at other positions, preferably in the edge area of the storage box. Equally, an edge flange, angled outwards, of the storage box could comprise nail holes, an adhesive layer or other fastening means for the temporary fastening onto a formwork.

Figure 3 shows an angle bracket 30 together with a rope loop 20 in a view without the storage box. The storage box 10 thus does not require any elements in order to keep the rope loop 20 in the angled position in which the eye 21 is angled by approximately 90° with respect to the rope ends 22. The angle bracket 30 is e.g. a plastic part which is preferably produced in an injection-moulding process and which contains corresponding leadthroughs and bending stops 35, which make it possible to keep the rope loop 20 overall in the position shown. The angle bracket 30 essentially consists of a base 31, which, as can also be seen in particular in Figures 4 and 6, also comprises, on its underside, an attachment 34, which at the same time forms a bending stop for the rope loop, in which the rope ends 22 are guided essentially perpendicularly to the side of the base and to the bottom of a storage box 11. A corresponding angle bracket 30, optionally also with locking or fixing means for the fastening on the edge of the opening 15 of the storage box 10, is already known in this form. The angle bracket 30, shown and described here, according to the present invention, differs from these conventional angle brackets primarily by the circumferential sealing flange 32, which is attached on the lower edge of the base 31.

Further details of the angle bracket 30 can be seen in a sectional view according to Figure 6a, which, in a section through Figure 1 perpendicular to its longitudinal direction, corresponds to a region which is close to the open end side of the angle bracket 30.

Figure 4 shows a view into the inside of a formwork 40, wherein the storage device 100 according to the invention is fastened on an end-side formwork plate 40. As already mentioned, magnets 18 can be arranged and fixed in the chambers at the ends of the storage box 10, which magnets, when the formwork plate 40 consists of steel, for instance, hold the storage box 10 with the rope loops received therein securely on the formwork plate 40. The magnets and the corresponding chamber 18, or the upper edge of the chambers 18, which is partially formed by the bar 19, can be designed and formed such that an upper face of the magnets is somewhat below the outer surface or top side 14 of the storage box 10, with the result that the magnets press the circumferential upper edge of the top side 14, which incidentally is open, securely and tightly onto the formwork board. The chambers 18 and the magnets can have dimensions such that when a slight elastic deformation of the edge of the chambers 18 occurs, a contact between the magnets and the formwork plate 40 just results.

As can clearly be seen in Figure 3, in this arrangement the free ends 22 of the rope loops 20 project, essentially perpendicularly to the face of the formwork plate 40 and thus perpendicularly to an end side, forming later, of a precast concrete part, into the free space bordered by the formwork, which space is laterfilled with fluid concrete. The free rope ends 22 are thus encased and concreted-in in the concrete together with the ferrule 24 which presses the ends firmly together.

Figures 6b and 6c show further variations of a corresponding angle bracket with somewhat varying flange shape.

Figures 6a-c are described below in connection with each other.

In Figure 6a the storage box 10 with an inserted angle bracket 30 can be seen in cross section. Furthermore, in the section, the two portions of the eye 21 can be seen, which are pressed down by two opposite flange-like holding-down clamps 35 of the angle bracket 30, such that they are kept in the position of the eye 21 angled by 90° with respect to the rope ends 22.

In the cross section views of Figures 6a-6c, it can be seen that the storage box 10 comprises relatively solid walls 12 and a corresponding bottom 11, wherein the storage box 10 in the embodiment variations shown has relatively solid walls, as would be typical for an injection-moulded plastic part, wherein, however, the storage box in particular can also be produced from steel or another stable material and, of course, also with lower wall thickness. The outer surfaces of the walls 12 are tilted by approximately 10° with respect to a perpendicular to the bottom 11, with the result that an approximately trapezoidal outer cross section of the storage box 10 or 10’ results. The storage box 10 in Figure 6a comprises, just like the two storage boxes 10’ shown in Figures 6b and 6c, an approximately rectangular bottom opening 15, into which the angle bracket 30 (or 30’ or 30”) is inserted tightly in each case. For the tight insertion into the opening 15, the angle bracket 30 comprises, in the lower region of its base 31, a circumferential flange 32, which is clearly bevelled at its outer edges in the case of Figure 6a, with the result that these bevelled faces act as a type of “sealing cone” 36, as the lower circumferential edge of the bottom opening 15 is bevelled in a similar manner. On the sealing flange 32, close to the corners of the sealing flange, there are also clamping brackets or locking means 33, which comprise either a nose-like projection or at least a certain bulge on their outer side and are bevelled at their upper ends, with the result that the angle bracket can be inserted into the bottom opening 15 from below without problems, wherein the sealing cone 36 is attached closely and tightly on the bevelled edge face of the bottom opening 15 and the nose-like projections of the locking means 33 ultimately lock in behind the upper edge of the bottom opening 15.

Expediently, the angle bracket 30 is introduced, together with the rope loops 20 already held therein at an angle, into the bottom opening 15 from below. In order to be able to place the free end of the eye 21 into the storage box, the angle bracket with the rope loop 20 and the eye 21 shown in Figure 3 must also be initially somewhat tilted and introduced into the storage box 10 through the bottom opening 15 with the eye 21 first, and then the angle bracket is correspondingly aligned and introduced into the bottom opening 15 with its base part 31 and the locking means 33 until the position shown in Figure 6a is reached. The eye 21 then lies flat and approximately parallel to the bottom 11 in the storage box, as is shown in Figure 1. The same also occurs with the second rope loop 20 and the second angle bracket 30 in Figure 1, wherein one eye 21 lies over the other eye 21. It is understood that the clearance of the storage box 10 is sufficient in order to receive both eyes laid one on top of the other without one of the eyes projecting beyond the open top side 14.

In Figures 6b and 6c, variations in the formation of the sealing flange are reproduced. In these embodiments, the bottom opening 15 does not need to have a bevelled sealing face. Instead, in the case of the embodiment example according to Figure 6b, a sealing edge 36’ is attached tightly on the outer side of the bottom 11 from below. A variation of this is shown in Figure 6c, in which the sealing edge is shown as a sealing lip 36” which is angled upwards and which, in the state shown in Figure 6c, is attached on the underside of the bottom 11 under elastic pretensioning. All other details of the embodiments shown in Figures 6b and 6c correspond to the variation according to Figure 6a already described.

In Figure 5 a finished concrete part which has been produced using the storage device according to the invention can be seen. Figure 5 only shows a section of a generally larger concrete slab 50, which, for example, can be used as a wall panel in building construction. Along an end side of the formwork 14 shown in Figure 4, a plurality of storage boxes 10 can, of course, be arranged at intervals next to or on top of each other, with the result that a plurality of such rope loops or eyes 21 can protrude accordingly at an end side 51 of a concrete slab 50, as is shown in Figure 5, at corresponding intervals.

As can be seen, the end side 51 of the precast concrete part 50 comprises a recess 52 after the storage box 10 has been removed from this recess. After the eyes 21 had been detached from the holding-down clamps 35 of the angle bracket 30 and brought into the folded-out position shown in Figure 5, the storage box 10 was pulled off the angle brackets 30 upwards and over the eyes 21. For this purpose, the locking means 33 intentionally only have a relatively small nose-like projection or simply a bulge without a sharp projection, with the result that they can be detached from the edge of the bottom opening 15 by applying an acceptable and not too large a force (i.e. by hand and without auxiliary tools) when a corresponding pull is applied to the storage box 10. The slightly tilted outer surfaces of the side walls 12, 13 of the storage box 10 additionally allow a relatively easy separation out of the concrete bed surrounding these walls, particularly when the storage box 10 is produced from a superficially relatively smooth material that adheres poorly to concrete, or is provided with an appropriate coating, varnishing or the like. The adhesion of the walls 12, 13 and the bottom 11 to the concrete of the precast part 50, which is also influenced by different external conditions, can, however, make it necessary to use a tool to detach the storage box. The lateral cams or projections 17 can provide purchase for gripping from behind using a tool.

Only the angle brackets 30, the lower attachments 34 of which, together with the parallel, free ends 22 of the rope loops 20, are embedded firmly in the concrete, remain in the precast concrete part 50. In order to connect a plurality of precast concrete parts 50, these are aligned relative to each other with their end sides such that the eyes 21 which protrude from the two precast concrete parts overlap such that at least one reinforcement element can be pushed through the overlapping eyes. The end sides 51 of the precast concrete parts 50 concerned are brought into appropriately close spacing, and the remaining gap is cast with a grouting mortar, which also fills the cavity 52 and in this way produces a good, positive-locking connection between the two parts, wherein the grouting mortar in the recess 52 adheres substantially better to the concrete surfaces of this recess than would be possible to the walls of a storage box 10 remaining permanently in the recess 52.

Claims (15)

A cable loop storage device (100) with a storage box (10) which accommodates at least one clamping means and a cable loop (21) of the cable loop (20), wherein the storage box (10) comprises a bottom (11) and side walls (12). , 13) and wherein at least one opening (15) is provided at the bottom (11) of the storage box for conducting free ends (22) of the cable loop (20) protruding out of the storage box and receiving a portion of the clamping means, wherein the storage box, except for a bottom opening for penetrating the free ends of the cable loop, is substantially fully closed and / or can be sealed relative to the formwork to prevent the cable loop included in the storage box from being surrounded by concrete, characterized in that the storage box (10 ) after attaching the free ends (22) of the cable loop (20) in a concrete bed can be removed from the cable loop and the associated clamping means, where applicable, where the clamping member is designed as an angle holder (30) holding a cable or loop (20), which consists of a cable eye (21) and two parallel free ends (22), in an angular state, the angular holder (30) comprising a base (31) partially receiving and fixing the cable eye (21), the socket (31) comprises a circumferential and sealing flange (32) disposed on the outside of the bottom of the storage box (10), and in which the socket and / or on the sealing flange are provided with means for temporarily fixing the angle holder on the storage box, where the engagement elements are located in a detachable engagement with the rim of the bottom opening so that, with a well-defined force exerted on the storage box perpendicular to the bottom and away from the concrete bed, they can be brought out of engagement, and the storage box consists of a sufficiently stable and solid material for it to be released from a concrete bed that surrounds the bottom and side walls, and from the bracket without damage. Storage device according to claim 1, characterized in that the storage box (10) has essentially an elongated box shape. Storage device according to one of claims 1 to 2, characterized in that the upper surface (14) of the storage box (10) which lies opposite the bottom (11) is at least partially open or has undercut recesses or that at least the walls or the bottom are provided. one projection (17), and in each case to apply a pull-out force to the storage box to pull it out of the concrete bed. Storage device according to one of Claims 1 to 3, characterized in that the upper surface (14) of the storage box (10) which lies opposite the bottom (11) together occupies a larger area than the bottom (11), so that the side walls (12, 13), deviating from an exact box shape, starting from the bottom (11) inclined slightly outward. Storage device according to one of the preceding claims, characterized in that at least the outer surfaces of the storage box (10) consist of a smooth material which is poorly adhered to concrete. Storage device according to one of the preceding claims, characterized in that the sealing flange (32) bears against the inside of the storage box (10) pyramidal tapered circumferential surface, and can be suitably inserted into a bottom opening (15) of the storage box (10). ). Storage device according to one of the preceding claims, characterized in that the sealing flange (32) has a protruding portion of at least 5 mm measured in the plane of the sealing flange (31). Storage device according to one of the preceding claims, characterized in that the sealing flange (32) surrounds the socket (31) substantially completely. Storage device according to one of the preceding claims, characterized in that clamping brackets (33) are provided on the base (31) and / or on the upper side of the sealing flange (33) for a temporary fixation of the angle bracket (30) on the storage box ( 10). Storage device according to one of the preceding claims, characterized in that the storage box (10) is designed as a reusable storage box (10). Storage device according to one of the preceding claims, characterized in that the storage box (10) consists of metal, in particular of steel, or of a plastic material that is resistant to weathering and liquid concrete. Storage device according to one of the preceding claims, characterized in that the storage box (10) on the upper side (14) of the bottom (11), comprises connecting devices (18) for connection with a formwork. Storage device according to one of the preceding claims, characterized in that the connecting devices are magnets (18) arranged near the ends or laterally on the edge of the storage box (10). 14th Storage device according to one of the preceding claims, characterized in that the bottom of the storage box (10) comprises two openings (15) for inserting the free ends of two cable loops (20) which can be simultaneously accommodated in the storage box (10). Method for manufacturing and connecting concrete elements, wherein at least one storage box with at least one angled cable loop abuts against a partition wall of a formwork and is poured with concrete, which, after curing of the concrete and for connection of adjacent concrete elements, is folded into the storage box. cable eye of the cable loop out of an open side of the concrete element towards an outer surface of the storage box, characterized in that a storage box according to one of claims 1 to 14 is used, which for subsequent re-use after folding of the cable eye is removed from the concrete element.