EP4273349A1 - Wall spacer with u-bracket - Google Patents

Abstract

The invention relates to a spacer (100) for maintaining a distance between concrete formwork sides or concrete parts, in particular between concrete walls or the concrete shells (301, 302) of a concrete double wall (300), which spacer (100) has: - a first spacer leg ( 110) with a widening (131) or other anchoring associated with a first leg end (111) of the first spacer leg (110), and a first cover (113) assigned to the first leg end (111) of the first spacer leg (110), - a second spacer leg (120) with a widening (132) or other anchoring associated with a first leg end (121) of the second spacer leg (120) and a second cover (123) assigned to the first leg end (121) of the second spacer leg (120), - a connecting bridge ( 140), wherein the connecting bridge (140) has a connecting device or a connecting portion (234) for connecting to a contact foot (220a, b, c) of a mounting system (200).

Description

• einen ersten Abstandhalterschenkel mit einer einem ersten Schenkelende des ersten Abstandhalterschenkels zugeordneten Verbreiterung oder sonstigen Rückverankerung und eine dem ersten Schenkelende des ersten Abstandhalterschenkels zugeordnete erste Abdeckung, und
• einen zweiten Abstandhalterschenkel mit einer einem ersten Schenkelende des zweiten Abstandhalterschenkels zugeordneten Verbreiterung oder sonstigen Rückverankerung und eine dem ersten Schenkelende des zweiten Abstandhalterschenkels zugeordnete zweite Abdeckung.

The invention relates to a spacer for maintaining a distance between concrete formwork sides or concrete parts, in particular between concrete walls or the concrete shells of a concrete double wall, the spacer having:

• a first spacer leg with a widening or other anchoring associated with a first leg end of the first spacer leg and a first cover associated with the first leg end of the first spacer leg, and
• a second spacer leg with a widening or other anchoring associated with a first leg end of the second spacer leg and a second cover associated with the first leg end of the second spacer leg.

The invention also relates to a mounting system with a spacer and a contact foot.

The invention generally relates to the production of concrete double walls, in particular in a precast concrete factory, from two reinforced concrete shells. The concrete shells are typically manufactured in precast concrete factories and are arranged parallel to one another and at a distance from one another. The space formed by the distance can be filled on the construction site with on-site concrete or another material. For the purpose of producing the concrete shells, filling and transport purposes, various fastening and anchoring devices are installed in the flowable concrete. When filling the space between the double wall on the construction site with liquid concrete, the double wall in particular must be secured against concrete pressure using clamps or fasteners. Concrete pressure generally occurs when, when filling the gap between the double wall with flowable concrete, the concrete shells are pushed apart by the pressure of the concrete.

The AU 200 031 307 B3 relates to a double-sided magnetic holder with a base and a projection. The holding device is with a strong magnetic material, such as neodymium. The diameter of the projection is designed so that it can be slidably pushed into a threaded receptacle of an anchor sleeve.

The EP 1 045 087 B1 shows a transport anchor for anchoring formwork and scaffolding, which is cast recessed into a concrete wall. In order to protect the screw channel of the transport anchor from corrosion when not in use, a plug is provided which can be inserted into the screw channel after the recess body has been removed.

The US 2017 / 0 298 617 A1 relates to a mounting system with a recess body that has a conical shaft. The base of the recess body can be attached to the formwork wall using a holding magnet. At the tapered end of the shaft there is a further circular cylindrical shaft section onto which an anchoring means can be pushed. This cylindrical section is connected to an external thread onto which a transport anchor with an anchoring ring disk can be screwed.

From the BGW online catalog (https://www.bgw-bohr.de/pdf/Deutsch Gesamt. pdf, page 163 there, accessed on April 29, 2022 ) spacers are described for the production of double walls in the precast concrete factory, which are used as built-in parts in the concrete part. One of these spacers has a cross structure assigned to the first concrete shell, of which a crossbar absorbs the pressure caused by gravity from the already concreted first shell, which has been turned upwards, when the second shell is concreted.

The spacers and mounting systems known in the prior art are limited in their functionality, so that additional different fastening and anchoring means are necessary for producing a double wall, which increases the number of parts and thus the costs for producing a double wall.

It is the object of the present invention to eliminate the disadvantages of the prior art and to provide fastening and anchoring means To provide a double wall that ensures sufficient stability and requires as little material or parts as possible.

The task is solved by a spacer according to claim 1 and a mounting system according to claim 8. Optional versions can be found in the subclaims and the description.

The task of the type mentioned at the beginning is characterized in that the first spacer leg and the second spacer leg are connected to one another at or in the area of a second leg end by a connecting bridge and the connecting bridge has a connecting device or a connecting portion for connecting the connecting bridge to a contact foot.

The connecting bridge between the spacer bars or legs can replace the cross structure of the spacers already known in the prior art. The slipping or slipping of the first concrete shell when producing the second concrete shell is then no longer prevented by the cross structure, as in the prior art, but by the connecting bridge. In order to save components, two spacers can be replaced by a single spacer, which has further advantageous properties. In addition, a widening or other anchoring is arranged at the other end of the spacer, i.e. the end assigned to the second concrete shell. This widening, in cooperation with the connecting bridge of the first concrete shell, holds the concrete shells in position against concrete pressure when concreting the gap. When the second concrete shell is formed, the first leg ends rest on the formwork wall of the formwork table using a turning station, which is why the concrete cover of the first leg ends is only minimal or eliminated entirely. In order to protect the leg ends made of reinforcing steel against rust, the leg ends are covered with plastic caps.

In a preferred development, the spacer legs and the connecting bridge form the sections of a C-shaped or U-shaped bracket, wherein the spacer legs form the U or C legs and the connecting bridge forms a U or C middle section.

In a particularly advantageous embodiment of the invention, the spacer approximates a U-shape, i.e. with elongated U-legs and a U-center section that is shortened compared to the U-legs. Depending on the specific geometry and position of the spacers, C, V, H or A shapes are also implied. To simplify matters, only the U-geometry will be used below. Such open bracket geometries with free leg ends have proven to be particularly advantageous for producing concrete double walls compared to closed bracket geometries (e.g. curved single-strand quadrilaterals or ellipses) and can replace closed bracket geometries. When producing the second concrete shell, the free leg ends of the open bracket geometries can simply be immersed in the flowable concrete of the second concrete shell with lower resistance. As soon as the free leg ends rest on the formwork base of the second concrete shell, this can relieve the static load on the manufacturing arrangement and additionally stabilize it. If closed bracket geometries were used instead of open bracket geometries, the connecting bridge between the first leg ends would have to be very stable. This is the only way a spacer could support the load of the first concrete shell resting on it when it is immersed in the concrete of the second concrete shell without bending. Instead of a second connecting bridge, free first leg ends with widenings or other anchorings are arranged on all spacer legs. Only in the case of spacers that are to be used at the same time as transport anchors for lifting the hardened double walls can additionally stabilized closed bracket geometries be used (e.g. disclosed in the as yet unpublished European patent application with the application number EP 22164965.0 same applicant, see also Figures 7 and 8 ) be provided.

The spacer can be produced particularly cost-effectively if the C-shaped or U-shaped bracket is in one piece and bent from a rod or strand material.

The U-bolt for the spacers can, for example, be manufactured particularly cost-effectively from BSt 500 type rebar steel. The widenings can also be made as transverse or inclined webs from the same rebar as the U-bolt and then welded to the U-bolt. Typically, the spacer legs form a right angle with the connecting bridge, i.e. the legs are perpendicular to the U-center section. This arrangement prevents the weight of the first concrete shell from bending the U-legs after the first concrete shell has been turned.

However, mounting systems and installation methods can also be provided in which it is advantageous if the spacer legs as U-legs each enclose a U-profile angle with the connecting bridge as a U-center section and the U-profile angle is more than 90°, preferably between 95° and 105°. Such a design can be particularly advantageous if the first leg ends, i.e. the cross structures, are first installed in a concrete shell and the connecting bridge is only then installed in another component.

Preferably, the connecting device of the connecting bridge has a receiving passage or other placeholder through which the contact foot passes or can be enforced.

A support foot can be attached to the spacer through a receiving passage or another placeholder, with which the spacer can be attached to the formwork wall before the first concrete shell is produced. The receiving passage or other placeholder for the contact foot is preferably arranged centrally on or in the area of the connecting bridge in order to introduce the load from the contact foot into the component as evenly as possible. The receiving passage is delimited by a peripheral wall which is closed or has a transverse access for radial insertion of the contact foot.

The receiving passage with a ring or is particularly advantageous from a static point of view a sleeve is formed and the connecting bridge has a groove or a curvature for complementary or positive contact with the sleeve.

A receiving passage for a contact foot can be provided particularly cost-effectively using a ring or a sleeve. The ring or the sleeve are preferably welded to the connecting bridge. In the following, the term sleeve is simply written, which implies a ring or a comparable connecting piece. The connecting bridge preferably runs according to the circular arc of a semicircle and thus forms a curvature or groove for a receptacle for the complementary contact of the sleeve. After hardening, the sleeve remains as a lost component in the first concrete shell. Therefore, for a cost-effective variant of the spacer, provision can be made for the receiving passage to be designed with a plastic component as a sleeve. By accommodating the sleeve in a groove, the central axis of the sleeve is essentially in the same plane as the rod axes or leg axes of the spacer legs. The same applies to the central axes of the support foot or transport anchor when assembled. This means that tensile forces on the transport anchor are distributed particularly evenly across the double wall.

Alternatively, the connecting device of the connecting bridge can be connected or connected to a receiving passage belonging to the supporting foot, the receiving passage being penetrated by the connecting bridge. In this case, the connecting device is designed as a central portion of the U-center section, which optionally has an additional connecting means. The additional connecting means can be a welding area where the U-center section can be welded to a shaft of a mounting system. The shaft of the mounting system is designed as a cross-hole sleeve. The receiving passage is expediently formed as a transverse hole in a transverse hole sleeve. The transverse hole sleeve can have an internal thread for screwing to an adhesive disk of the contact foot or another coupling device. The main advantage of this design is that it can be implemented cost-effectively. This eliminates the need to form a curve or groove in the U-bolt of the U-center section, as well as an additional transport anchor.

Preferably, the receiving passage is formed with a ring or a sleeve, the ring or the sleeve having one or more means for a stop for the contact foot.

The sleeve can be pushed or plugged onto the contact foot using the stop. This enables quick, error-free assembly. The stop ensures a minimum distance from the formwork wall and thus a minimum concrete cover for the connecting bridge.

The means or means for the stop are formed by means of a taper of the inner wall of the ring, the sleeve or the receiving passage.

The receiving passage of the sleeve forms a guide or centering for the contact foot. This secures the spacer on the contact foot against unintentional slipping in the radial direction. The spacer can be secured in the axial direction, i.e. along the central axis of the receiving passage, by a threaded sleeve, whereby the threaded sleeve can be assigned to a transport anchor or other component. The stop is formed by a complementary taper, i.e. by an external taper of the shaft of the contact foot and an internal taper of the sleeve.

The widenings or re-anchorings of the first bar ends of the spacer legs are preferably formed with cross-like structures in which at least one transverse or inclined web is welded to the spacer legs. Typically, the widenings, in particular the transverse or inclined webs, of the individual spacer legs are designed separately from one another. In order to prevent the spacer legs from being pushed apart by the first concrete shell on top, the transverse or inclined webs can be connected to one another using an additional and optional connecting rod.

The technical inventive task mentioned at the beginning is also solved by an assembly system. The assembly system has a spacer for maintaining a distance between concrete formwork sides or concrete parts, in particular between concrete walls or the concrete shells of a concrete double wall, in particular a spacer in one of the variants already described. The mounting system further includes a support foot for supporting or attaching the spacers to a formwork wall.

The formwork wall can be a formwork table. The contact foot can also correspond to a recess body in a mounting system according to the invention. The contact foot has a base, preferably a permanent magnetic adhesive disk, for attachment to a magnetizable formwork wall. The base is adjoined by a preferably elongated shaft, which couples to the spacer in one of the embodiments described below and thereby ensures a distance between the spacer and the formwork wall and thus a sufficient concrete cover. The contact foot can be made in one piece or in several parts. In particular, it is conceivable that holding magnets, receptacles for the spacer and the transport anchors are designed in separate components.

For quick assembly of the mounting system, the spacer is attached or can be attached to the support foot.

Plug-in connections can be implemented particularly quickly and therefore cost-effectively. For additional support of the spacer on the contact foot, screw connections or clamp connections can be provided, if necessary with the participation of the connecting bridge.

The contact foot preferably has an outer conicity or a tapered shaft, which is designed to form a stop complementary to an inner conicity or a tapered inner wall of the spacer.

The spacer is attached to the conical shaft of the contact foot. For this purpose, the sleeve of the spacer has a complementary, also conical, circumferential inner wall. In addition to the stop acting in the axial direction, the complementary cones provide an in Guidance or centering acting in the radial direction. Alternatively, the contact foot can be screwed directly to the spacer if the receiving passage has a corresponding internal thread. In this case, additional transport anchors are unnecessary. Another alternative is that there is no screw connection and thus a threaded bolt on the contact foot and the spacer is held on the contact foot by gravity. Gravity may be enough to hold the spacer in place when making the first concrete shell. Double walls are also conceivable, in which spacers are mounted partly with and partly without additional transport anchors. Additional assembly aids can also be provided for wall assembly on the formwork walls.

In a preferred embodiment, the mounting system has a transport anchor for attaching the spacer to the support foot. The transport anchor is used for coupling to an external load-carrying device or a wall support. Transport anchors and spacers can therefore be mounted on a single support foot, which reduces the number of parts and speeds up the assembly process. The number of transport anchors depends on how many wall supports or load-carrying devices are required to support or transport the double wall.

Transport anchors that are particularly advantageous for the assembly system have a cross-sectional extension for anchoring back in a concrete component, with the cross-sectional extension being penetrated by the contact foot in the assembled state.

The cross-sectional extension is preferably designed as an annular disk and forms additional anchoring, reinforcement or additional support for the assembly system in the concrete. After hardening, the ring disk additionally forms a contact surface for the first concrete shell and thus prevents the first concrete shell from slipping on the wall spacer when producing the second concrete shell. Transport anchors with cross-sectional extensions are the yet unpublished European ones Patent applications with the application number EP 20210558.1 and EP 21182386.9 from the same applicant.

The contact foot preferably has an external thread or an internal thread for attaching the spacer.

The external thread of the contact foot preferably connects to the tapered end of the shaft as a threaded bolt and can be formed or designed to complement the internal thread of a threaded sleeve of the transport anchor. The internal thread of the contact foot is alternatively or additionally formed with a hole in the end wall of the shaft and can be formed or designed to be complementary to an external thread of a transport rod of the transport anchor. Threaded connections can be installed particularly quickly and intuitively.

In an optional further development, the connecting bridge of the spacer is arranged in the assembled state between the formwork wall and the external thread of the contact foot.

The component screwed to this external thread forms a contact with the connecting bridge or the sleeve and thus prevents the sleeve from slipping off the contact foot, in particular from the shaft of the contact foot.

The mounting system is already sufficient for producing and lifting the double wall if the transport anchor comprises a transport rod, the transport rod being designed or capable of being formed with a transport rod foot with a widening or conical extension towards a transport rod end or transport rod section which is further away, opposite or spaced from the contact foot.

The advantage of this variant of the mounting system is that this variant is sufficient for creating a double wall because the transport anchor can be coupled to an external means of transport to lift the double wall. Additional systems or spacers can be omitted, which reduces the number of parts and further simplifies storage. transport anchor with transport rod, for example with Dywidag DW15 external thread and slotted pipe are the still unpublished European patent application with the application number EP 22164965.1 and the as yet unpublished German patent application with the file number DE 10 2021 129 101.1 from the same applicant. Particularly advantageously, such a transport anchor can be removed from the double wall without leaving any residue and reused.

Fig. 1

ein zerlegtes Montagesystem einer ersten beispielhaften Ausführungsform der Erfindung in perspektivischer Darstellung, in

Fig. 2

ein Montagesystem mit montiertem Abstandhalter auf dem Aufstandsfuß in der ersten beispielhaften Ausführungsform der Erfindung in perspektivischer Darstellung, in

Fig. 3

eine Teilschnittdarstellung eines montierten Montagesystems der ersten beispielhaften Ausführungsform der Erfindung, in

Fig. 4

ein montiertes Montagesystem der ersten beispielhaften Ausführungsform der Erfindung in perspektivischer Darstellung, in

Fig. 5

ein zerlegtes Montagesystem einer zweiten beispielhaften Ausführungsform der Erfindung in perspektivischer Darstellung, in

Fig. 6

ein montiertes Montagesystem der zweiten beispielhaften Ausführungsform der Erfindung in perspektivischer Darstellung, in

Fig.7

einen U-Bügel in einer beispielhaften alternativen Ausführungsform der Erfindung, und in

Fig. 8

ein montiertes Montagesystem der dritten beispielhaften Ausführungsform der Erfindung in perspektivischer Darstellung.

Further details, features, feature (sub)combinations, advantages and effects based on the invention result from the following description of a preferred exemplary embodiment {or. -examples} of the invention and the drawings. These show in

Fig. 1

a disassembled assembly system of a first exemplary embodiment of the invention in a perspective view, in

Fig. 2

a mounting system with a mounted spacer on the contact foot in the first exemplary embodiment of the invention in a perspective view, in

Fig. 3

a partial sectional view of an assembled assembly system of the first exemplary embodiment of the invention, in

Fig. 4

a mounted mounting system of the first exemplary embodiment of the invention in a perspective view, in

Fig. 5

a disassembled assembly system of a second exemplary embodiment of the invention in a perspective view, in

Fig. 6

a mounted mounting system of the second exemplary embodiment of the invention in a perspective view, in

Fig.7

a U-bracket in an exemplary alternative embodiment of the invention, and in

Fig. 8

a mounted mounting system of the third exemplary embodiment of the invention in a perspective view.

The figures are merely exemplary in nature and only serve to understand the invention. The same elements are given the same reference numbers.

Figure 1 shows a first exemplary embodiment of a mounting system 200 in a disassembled state, comprising a spacer 100, a transport anchor 210 and a support foot 220a. The spacer 100 includes reinforcing steel that is bent into a substantially U-shaped bracket 150. The free ends of the U-legs, i.e. the spacer legs 110, 120, are in the finished double wall 300 preferably in the same concrete shell, in particular the second concrete shell 302 (cf. Figure 4 ) immersed. In order to anchor the free ends and thus the U-bracket 150 in the hardened concrete, widenings 131, 132 are provided in the area of the free ends, i.e. the first leg ends 111, 121, to form a back anchor in the hardened concrete. These widenings 131, 132 are realized in an open profile in which two or more pieces of reinforcing steel, in particular comparatively short pieces, are welded to the U-bolt 150 as transverse webs 133, 134. The first leg ends 111, 121 are protected against rust by covers 113, 123, the covers 113, 123 being formed by plastic caps which are pushed onto the free leg ends 111, 121. The plastic caps 113, 123 have a thickening 135 or projection for their own anchoring in the hardened concrete part. A connecting bridge 140 connects the adjacent second leg ends 112, 122 and thus forms the U-center section of the U-bracket 150. The spacer 100 is essentially mirror-symmetrical to a plane of symmetry, with the central axis 143 of the passage 141 or the in the plane of symmetry Sleeve 142 is located. This means that the central axes 223, 217 of the base 220a or the transport anchor 210 in the assembled state (see Figure 4 ) lie in the same plane as the leg axes or rod axes of the spacer legs 110, 120, the connecting bridge 140 forms a placeholder or a connecting device with a receiving passage 141, which is penetrated or can be enforced by the contact foot 220a.

For this purpose, the receiving passage 141 is also formed with a sleeve 142 which is inserted into a groove 145 of the connecting bridge 140. The groove 145 of the reinforcing steel essentially forms a linear contact with the outer wall of the sleeve 142. The sleeve 142 is inserted into the groove 145 in a complementary or form-fitting manner. The U-center section of the U-bracket 150 is in three Sections are divided, with the first section and the third section lying on an imaginary straight line or in alignment and the second middle section being curved to form a groove 145 corresponding to the sleeve 142. Sleeve 142 and fillet 145 can also be welded together.

Figure 2 and Figure 3 show the principle of a mounting arrangement for attaching the device 100 to the formwork wall 400 before concreting. In Figure 2 the spacer 100 is placed on the support foot 220a, with the transport anchor 210 placed next to it. In Figure 3 the transport anchor 210 (shown in section) is screwed to the contact foot 220a for fastening the spacer 100 to the contact foot 220a. After producing the concrete part and removing the contact foot 220a, a load-carrying device (not shown) for lifting or supporting the concrete part can be screwed to the transport anchor 210. The transport anchor 210 has a cylindrical sleeve 212 with an internal thread 213. An annular disk 211 is arranged as a cross-sectional extension on a first end face of the cylindrical sleeve. The internal thread 213 of the sleeve 212 can be screwed to the external thread 222 of a threaded bolt 225 of the contact foot 220a, with the annular disk 211 being penetrated by the threaded bolt 225. Ring disk 211 and sleeve 212 are formed in one piece, preferably produced by deep drawing. The annular disk 211 can rest in contact with the sleeve 142 and/or an end wall 226 of the shaft 221. Tensile loads in the area of the sleeve 212 caused by a screw-in load-carrying device (not shown) can be transmitted via the annular disk 211, the sleeve 142 (in Figure 3 shown in section) and the connecting bridge 140 (in Figure 3 shown in dashed lines) evenly distributed throughout the concrete component, which improves the reinforcement.

The diameter D1 of the annular disk 211 of the transport anchor 210 projects beyond the diameter D2 of the sleeve 142 and can therefore form an additional anchoring surface that can be concreted into the precast concrete part in a form-fitting manner. Virtually as an additional recess body 214 for an additional cavity 215, in particular for an extended screw channel, there is a form-fitting and/or on the sleeve 212 in the area of the second end face of the sleeve 212 Frictionally fitting hollow cap 214 is attached. The cavity 215 allows threaded bolts from external load-carrying devices to be screwed into the transport anchor 210, the length of which exceeds the length of the threaded sleeve 212. The hollow cap 214 closes the sleeve 212 in a fluid-tight manner against penetrating flowable concrete during concreting by means of a flat contact with the outer wall of the sleeve 212. The hollow cap 214 can be pushed completely onto the sleeve 212 so that the hollow cap 214 touches the annular disk 211. The area of the hollow cap 214 is completely or partially concreted into the concrete part.

The production of concrete shells is usually carried out on formwork tables, which is why the formwork wall 400 is horizontal and the assembly foot is placed on the formwork wall 400 as a contact foot 220a. The spacer 100 can be held on the contact foot 220a solely by gravity. The contact foot 220a is designed in such a way that, in the assembled state, the connecting bridge 140, sleeve 142 and ring disk 211 can be surrounded by flowable concrete and covered by concrete. On the one hand, this ensures a concrete cover to protect against weather influences, and on the other hand, a particularly secure anchoring of the transport anchor 210 and spacer 100 in the concrete part is created. The base 224 is plate-like, with an outer taper 228. The base 224 has an adhesive surface 227 for contact with the formwork wall 400 and a free surface 229 for supporting or fastening the spacer 100. The base 224 has a permanent magnet to be attached to a magnetizable metallic casing wall 400. The outer taper 228 makes it easier to remove the contact foot 220a from the hardened concrete part. The shaft 221 adjoins the free surface 229 of the contact foot 220a. The shaft 221 is designed with a gradation or with a diameter D4 that is reduced compared to the diameter D3 of the base 224 and also has an outer taper 230. The diameter D4 of the shaft 221 is therefore reduced starting from the base 224 towards the threaded bolt 225.

The shaft 221 ends with an end wall 226, to which the threaded bolt 225 adjoins with a reduced outside diameter D5 or a gradation. When assembled, the central axes 143, 217, 223 of sleeve 142, transport anchor 210 and support foot 220a coincide. The means for the stop 199 are formed by the inner conicity 144 of the sleeve 142 and the complementary outer conicity 230 of the tapered shaft 221.

Figure 4 shows a possible installation arrangement of a spacer 100 according to the invention in a double wall 300 with a transport anchor 210 in a first embodiment and the associated contact foot 220a. In the preferred installation arrangement, the connecting bridge 140, including the second leg ends 112, 122 adjacent thereto, are assigned to the first concrete shell 301. The first leg ends 111, 121 are assigned to the second concrete shell 302. The length of the spacer legs 110, 120 and thus the length of the U-legs of the U-bracket 150 determine the width of the space 303 between the concrete shells 301, 302.

In the precast concrete plant manufacturing process of the concrete double wall 300, the first concrete shell 301 is typically first concreted. For this purpose, the flowable concrete is placed on a formwork table 400 (cf. Figure 2 ) is added with a shaking station on which the support foot 220a stands with a spacer 100 and, if necessary, an additional transport anchor 210. After compacting, hardening and drying, the first concrete shell 301 is lifted and turned over using a turning station (not shown). The free first leg ends 111, 121 of the U-bolt 150 anchored in the first concrete shell 301, with attached protective caps 113, 123, dip from above into flowable concrete for the second concrete shell 302, which is provided on a formwork base 400. The first concrete shell 301 rests on the connecting bridge 140, the sleeve 142 and, if necessary, the additional transport anchor 210. By resting on these components, the first concrete shell 301 is prevented from slipping downwards. Meanwhile, the second concrete shell 302 can be formed with fresh concrete on the formwork floor. The covers 113, 123 can stand on the formwork base for the second concrete shell 302 or can be arranged at a very short distance from it. Of the several individual parts of the kit 200 (cf. Figure 3 ), the spacers 100 and, if necessary, the additional transport anchor 210 remain complete or partially in the manufactured concrete part 300.

According to Figure 5 In a second embodiment, the mounting system 200 can have an alternative contact foot 220b and an alternative transport anchor 240. The transport anchor 240 has a spacer or transport rod 242 with an external thread 245. A transport rod base 241 is formed on a first rod end 251 of the transport rod 242. The transport rod foot 241 widens along the longitudinal axis 217 towards the rod end 251 and, when producing a concrete part with a breakthrough at the breakthrough end, forms a correspondingly conically widened breakthrough opening, which after removal of the transport anchor 240 from the concrete part breakthrough through known conical ones Sealing plug can be closed. A recess tube 243 or cladding tube (hereinafter also “slit tube”) with a longitudinal slot (hidden) is pushed onto the transport rod 242 up to a stop 249, formed by the transport rod foot 241. After attaching the already described U-bracket spacer 100 to the outer cone 230 of the contact foot 220b (see also Figure 2 ), the second rod end 252 of the transport rod 242 protruding from the slot tube 243 and possibly a stiffening body (not shown) is screwed into a central hole (hidden) in the base 220b to form a threaded connection 244.

Base 224 and shaft 221 essentially correspond to the contact foot 220a already described (cf. Fig.2 ). Before being screwed to the transport anchor 240, the spacer 100 is held on the shaft 221 by the holding magnets of the base 242 or by gravity. However, additional fastening parts or assembly aids can also be provided. Instead of the external thread bolt 225 (cf. Figure 2 ) the shaft 221 of the contact foot 220b has the Figures 5 and 6 on the end wall 226 there is an internally threaded hole (internal thread hidden) for the complementary external thread 245 of the transport rod 242. Due to the larger outer diameter of the external thread 245 compared to the inner diameter of the slot tube 243 (in the relaxed state), the longitudinal slot is widened when pushed over and the slot tube 243 is thus expanded in diameter. Through the external thread 245 on the transport rod 242 its Contact surface and thus its friction with the inner jacket of the slotted tube 243 is reduced, so that the transport rod 242 can be pushed into and pulled out of the slotted tube 243 more easily. When the transport rod 242 is pulled out of the slot tube 243, the latter shrinks in diameter and can therefore be more easily pulled out of a breakthrough formed with the slot tube 243 in a freshly cast and hardened concrete part.

Figure 6 shows an installation arrangement of a spacer 100 according to the invention in a double wall 300 with a transport anchor 240 in a second embodiment and the associated contact foot 220b. The installation of the spacer 100 and the contact foot 220b essentially corresponds to the installation according to Figure 4 , also the production of the first concrete shell 301. After turning and during the production of the second concrete shell 302, the free first leg ends 111, 121 of the U-bolt 150 anchored in the first concrete shell 301 emerge together with the first transport rod end 251 or the transport rod base 241 at the top in flowable concrete for the second concrete shell 302. The first concrete shell 301 rests on the connecting bridge 140 and the sleeve 142. In this embodiment, the covers 113, 123 and the transport rod base 241 end on an imaginary straight line or plane and thus stand together on the formwork base for the second concrete shell 302. A mounting system 200 with transport rod foot 241, transport rod 242 and contact foot 220b creates a breakthrough (not shown) in both concrete shells 301, 302 of the finished double wall 300. Between the concrete shells 301, 302, a central section of the transport rod 242 runs in the space 303 (covered by the slotted tube 243), which can be covered by the slotted tube 243 in the assembled state. After the concrete shells 301,302 have hardened, this middle section of the transport rod 242 is accessible to an external lifting device (not shown). A lifting strap or a coupling strap is particularly suitable for this. The transport rod 242 is connected by the threaded connection 244 (cf. Figure 5 ) in the first concrete shell 301 and releasably anchored in the second concrete shell 302 by the transport rod base 241. The connecting bridge 140 and the crossbars 133, 134 can serve as diagonal tension reinforcement when lifting the double wall 300.

Of the several individual parts of the kit 200 (cf. Figure 5 ), only the spacer 100 remains in the manufactured concrete part 300. The slotted tube 243 of the transport anchor 240 enables the transport anchor 240 to be removed without leaving any residue.

Typically, the U-profile angle ϕ is rectangular (cf. Figure 4 ). Fig. 7 shows an alternative embodiment of a U-bracket 150 or a spacer 100, in which the spacer legs 110, 120 each enclose a U-profile angle ϕ with the connecting bridge 140 and the U-profile angle ϕ more than 90 °, preferably between 95 ° and 105 °, is. Such alternative U-bolts 150 are particularly advantageous in conjunction with mounting systems 200 which are designed with a support foot 220b, transport rod foot 241 and a transport rod 242 (cf. Figures 5 and 6 ). This means that the first leg ends 111, 121 no longer have to bear the weight of the first concrete shell 301 by standing on the formwork table (cf. Fig. 6 ) to wear. Rather, the function is performed by the transport rod base 241.

In order to prevent the spacer legs 110, 120 from being pushed through the first concrete shell 301 on top (cf. Fig. 6 ) are pressed apart, the spacer legs 110, 120 are connected to one another with a continuous connecting rod 136, so that a closed profile is created. Connecting rod 136 and the transverse webs 133, 134 can be formed in one piece, or the connecting rod 136 is realized as an extension of the transverse webs 133, 134. The connecting rod 136 of the spacer 100 is firmly connected to the U-bracket 150, preferably by welding in the area of the transverse webs 133, 134.

Such a connecting rod 136 is also in the mounting system 200 according to Figure 8 arranged. In this embodiment, the contact foot 220c is made in several parts, i.e. with a separate base 224, 232 and a separate shaft 221, 231. The contact foot 220c is realized with a transverse hole sleeve 231 as a shaft 221 and a nail plate 232 as a base 224. The connecting device for connecting the connecting bridge 140 of the spacer 100 to the contact foot 220c is designed in which the transverse hole 233 (as

Receiving passage) of the transverse hole sleeve 231 is pushed onto a connecting portion 234 of the U-center section of the U-bracket 150. For fastening, the transverse hole sleeve 231 can be welded to the U-bracket 150. The Transverse hole sleeve 231 (see also https://www.bgw-bohr.de/pdf/Deutsch Gesamt.pdf, page 92 there, accessed on April 29, 2022 ) has a nail plate (not shown) 232 or a magnetic base 224 (cf. Figure 2 ) assigned internal thread, into which a complementary external thread of a threaded mandrel (hidden) of the Nagelteller 232 (https://www.bgw-bohr.de/pdf/Deutsch Gesamt.pdf, page 137 there, accessed on April 29, 2022 ) can be screwed in. The connecting bridge 140 is expediently welded to the transverse hole sleeve 231 in the connecting section 234 in the middle of the area of the transverse hole 233 in order to prevent lateral slipping along the U-bracket 150. The nail plate 232 for fixing the spacer 100 on the formwork 400 (cf. Fig. 2 ) when concreting the first concrete shell 301 (cf. Fig. 4 ) can have a plastic base for nailing onto wooden casing (not shown). Alternatively, the use of a magnetic base 224 (cf. Figure 2 ) possible. The U-profile angle φ of this embodiment can also be 90° or more than 90°, preferably between 95° and 105°.

Reference symbol list

100

Spacer

110

first spacer leg

111

first leg end of the first spacer leg

112

second leg end of the first spacer leg

113

Cover, especially plastic cap

120

second spacer leg

121

first leg end of the second spacer leg

122

second leg end of the second spacer leg

123

Cover, especially plastic cap

131

first widening or other anchoring

132

second widening or other anchoring

133

first transverse or inclined web

134

second transverse or inclined web

135

Thickening of the cover

136

Widening/crossbar connector, especially connecting rod

140

connecting bridge

141

Recording pass

142

Ring or sleeve

143

Central axis of the sleeve or the cross-hole sleeve

144

Internal taper, inner wall of the socket

145

Curvature, throat

150

U-bolt

199

attack

200

Kit

210

Transport anchor, first embodiment

211

Widening, especially ring disk

212

sleeve

213

inner thread

214

Hollow cap

215

cavity

217

Central axis, longitudinal axis

220a,b,c

Contact foot (a with external thread; b with internal thread; c multi-part)

221

shaft

222

External thread

223

Central axis of the contact foot

224

Base, especially adhesive disk

225

Threaded bolt

226

end wall

227

Adhesive surface

228

External taper of the base

229

free wall

230

External taper of the shaft

231

Cross hole sleeve

232

Bases, especially nail plates

233

Cross hole

234

Connection section

240

Transport anchor, second embodiment

241

Transport rod base

242

Transport rod

243

slot pipe

244

Thread connection

245

External thread

249

attack

251

first transport rod end

252

second transport bar end

300

Concrete part, double wall

301

first concrete bowl

302

second concrete bowl

303

space

400

Formwork, formwork wall, formwork table

D1

Outside diameter cross-sectional expansion

D2

Outer diameter sleeve

D3

Outer diameter base

D4

Outer diameter cone

D5

Outer diameter threaded bolt

ϕ

U-profile angle

Claims (15)

Spacer (100) for maintaining a distance between concrete formwork sides or concrete parts, in particular between concrete walls or the concrete shells (301, 302) of a concrete double wall (300), which spacer (100) has: - a first spacer leg (110) with a widening (131) or other anchoring, which is assigned to a first leg end (111) of the first spacer leg (110), and a first cover assigned to the first leg end (111) of the first spacer leg (110). (113), - a second spacer leg (120) with a widening (132) or other anchoring, which is assigned to a first leg end (121) of the second spacer leg (120), and a second cover assigned to the first leg end (121) of the second spacer leg (120). (123), characterized in that
the first spacer leg (110) and the second spacer leg (120) are connected to one another at or in the area of a second leg end (112, 122) by a connecting bridge (140) and the connecting bridge (140) has a connecting device or a connecting portion (234). Connecting with a contact foot (220a, b, c). Spacer (100) according to claim 1,
characterized in that
the spacer legs (110, 120) and the connecting bridge (140) form the sections of a C-shaped or U-shaped bracket (150), the spacer legs (110, 120) being the U or C legs, and the connecting bridge ( 140) form a U or C middle section. Spacer (100) according to claim 2,
characterized in that
the C-shaped or U-shaped bracket (150) is in one piece and bent from a rod or strand material. Spacer (100) according to one of claims 2 or 3,
characterized in that
the spacer legs (110, 120) each enclose a U-profile angle (ϕ) with the connecting bridge (140) as a U-center section and the U-profile angle (ϕ) is more than 90°, preferably between 95° and 105°. Spacer (100) according to one of the preceding claims, characterized in that the connecting device of the connecting bridge (140) has a receiving passage (141) or other placeholder through which the contact foot (220a, b) passes or can be enforced and the receiving passage (141) is formed with a ring or a sleeve (142) and the connecting bridge (140) has a groove (145) or curvature for complementary or positive contact with the sleeve (142). Spacer (100) according to one of claims 5, characterized in that the receiving passage (141) is formed with a ring or a sleeve (142), the ring or the sleeve (142) having one or more means for a stop (199) for the contact foot (220a, b) and the means or means for the stop (199) are formed by means of a taper of the inner wall (144) of the ring or the sleeve (142) or the receiving passage (141). Spacer (100) according to one of the preceding claims,
characterized in that
the widenings (131,132) or back anchorings are formed with cross-like structures, in which at least one transverse or inclined web (133,134) is welded to the spacer legs (110,120). Mounting system (200), characterized by the following components: - Spacer (100) for maintaining a distance between concrete formwork sides or concrete parts, in particular between concrete walls or the concrete shells (301, 302) of a concrete double wall (300), in particular one Spacer (100) according to one of claims 1-7, - Support foot (220a, b, c) for supporting or attaching the spacer (100) to a formwork wall (400). Mounting system (200) according to claim 8,
characterized in that
the spacer (100) is attached or attachable to the contact foot (220a, b, c). Mounting system (200) according to one of claims 8 or 9,
characterized in that
the contact foot (220a, b) has an outer taper (230) or a tapered shaft (221), which is complementary to an inner taper (144) or a tapered inner wall of the spacer (100) to form a stop (199). is trained. Mounting system (200) according to one of claims 8 - 10,
characterized in that
the mounting system (200) has a transport anchor (210, 240) for attaching the spacer (100) to the contact foot (220a, b). Mounting system (200) according to claim 11,
characterized in that
the transport anchor (210) has a cross-sectional extension (211) for anchoring back in a concrete component, the cross-sectional extension (211) being penetrated by the contact foot (220a, b) in the assembled state. Mounting system (200) according to one of claims 8-12,
characterized in that
the contact foot (220a, b, c) has an external thread (222) or an internal thread for attaching the spacer (100). Mounting system (200) according to claim 13,
characterized in that
the connecting bridge (140) of the spacer (100) is arranged in the assembled state between the formwork wall (400) and the external thread (222) of the contact foot (220a, b). Mounting system (200) according to one of claims 11-14,
characterized in that
the transport anchor (240) comprises a transport rod (242), the transport rod end (251) which is further away from the contact foot (220a, b) is designed or can be formed with a transport rod foot (241) which has a widening or conical extension.

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