WO2021204792A2

WO2021204792A2 - Mould core for a mould for producing hollow concrete bodies and a moulding device having such a mould core

Info

Publication number: WO2021204792A2
Application number: PCT/EP2021/058924
Authority: WO
Inventors: Johann SCHLÜSSELBAUER; Ulrich SCHLÜSSELBAUER
Original assignee: Schluesselbauer Johann; Schluesselbauer Ulrich
Priority date: 2020-04-06
Filing date: 2021-04-06
Publication date: 2021-10-14
Also published as: WO2021204792A3; DE102020204416A1

Abstract

The present invention relates to a mould core 300 for use on a moulding device 1000 for producing hollow and/or in particular tubular concrete bodies, and to a moulding device 1000 comprising such a mould core 300. The mould core 300 comprises a core shell 310 that extends in a longitudinal direction and has a strip-like longitudinal opening extending in a longitudinal direction from one end of the core shell 310 to the other, an expansion device 400 for expanding and/or spreading and/or contracting and/or shrinking the mould core 300, and a sealing element 500 that seals off the longitudinal opening in the core shell 310 and deforms flexibly and/or elastically when the mould core contracts. Arranged on the side of the sealing element 500 that faces the interior of the mould core 300 are one or more guide elements 600A-600E, and the expansion device 400 is set up such that at least one driver portion 490 of the expansion device 400 comes into contact, during the transition from a first shrinking operation to a second, with at least one entrainment portion 603a of the one or more guide elements 600A-600E of the sealing element 500 in order to guide the sealing element 500 in the second shrinking operation.

Description

Molding core for a mold for the production of hollow concrete bodies and a molding device having such a molding core

description

The present invention relates to a mold core for a molding device for producing hollow and / or in particular tubular concrete bodies and a molding device having such a molding core for producing hollow and / or in particular tubular concrete bodies. Furthermore, the present invention relates to a sealing element, in particular a strip-shaped sealing element, and / or a longitudinal strip forming such a sealing element for use on such a mold core.

background

Mold cores for molding devices for producing hollow and / or tubular concrete bodies have long been known in the prior art. For example, US Pat. No. 1,394,570 published in 1921 shows a generic mold core for use as an internal mold for a molding device for producing hollow and / or, in particular, tubular concrete bodies. The mold core of US 1,394,570 has an expandable and / or expandable core jacket which, in the expanded and / or expanded state, assumes the predetermined internal shape for the concrete casting process and is designed to be shrinkable and / or contractible for demoulding the concrete body. Such expandable mold cores are also regularly referred to as shrink cores in the prior art. Such shrink cores facilitate the demoulding of a concrete body formed between an outer core jacket of the molding device and the shrink core, in that the shrink core can be shrunk from the expanded set-up state assumed during the concrete casting process and is thereby lifted off the inner wall of the concrete body.

Another generic mold core and / or shrink core for use as an internal mold for a molding device for producing hollow and / or in particular tubular concrete bodies is described in DE 10 2012 220 814 A1. The shrink core according to DE 102012220814 A1 has a substantially cylindrical core jacket, which has an opening running in the longitudinal direction on one side, at whose mutually opposite longitudinal edge sections a spreading device arranged in the interior of the core jacket engages around the opposite longitudinal edge sections of the core jacket for expanding the To push the shrink core apart in the tangential direction. In order to seal the opening running in the longitudinal direction to the interior of the shrink core, in particular when the shrink core is in the expanded state in which the concrete casting process is carried out, according to DE 10 2012 220 814 A1, a connecting strip extending in the longitudinal direction is provided between the opposite longitudinal edge sections, which has at least one partially comprises elastomeric connecting web, which is connected to the longitudinal edges of the core jacket in a shear-proof manner. This enables a permanent, sealing connection of the two longitudinal edges of the core jacket both during the spreading process and during the shrinking process, so that a tightness of the core jacket that is effective in all positions of the shrink core can be ensured over the entire circumference. With the arrangement proposed in DE 10 2012 220 814 A1, a very good seal of the interior of the shrink core can be provided, but the elastomeric connecting strip is omitted during the spreading processes when setting up the shrink core and / or the and shrinking processes when removing the formwork from a concrete body the forming device is always exposed to alternating bending stresses, which leads to material fatigue which is detrimental to the service life, so that leaks due to wear can arise on the connecting strip and / or the connection to the longitudinal edges of the core jacket can partially or completely tear off.

In view of the disadvantages described above, based on the prior art described above, an object of the present invention is to provide a mold core for a molding device for producing hollow and / or in particular tubular concrete bodies and a molding device having such a molding core for producing hollow and / or in particular to provide tubular concrete bodies in which a cost-effective arrangement that reliably seals the core mantle to the inside can also be provided, which enables improved service life, is able to reduce material fatigue and / or wear and / or allows easier handling in the event of material fatigue and / or wear . summary

The present invention relates to a mold core for a molding device for producing hollow and / or in particular tubular concrete bodies and a molding device having such a molding core for producing hollow and / or in particular tubular concrete bodies. In particular, a mold core for a molding device for the production of hollow and / or in particular tubular concrete bodies according to claim 1 and a molding device comprising such a mold core for producing hollow and / or in particular tubular concrete bodies according to claim 15 are proposed to solve the above-mentioned object. Furthermore, a sealing element for use on such a mold core according to claim 13 is proposed. The dependent claims relate to exemplary preferred embodiments.

According to an exemplary aspect, a mold core for use on a molding device for the production of hollow and / or in particular tubular concrete bodies is proposed, comprising: a core jacket extending in the longitudinal direction, which is particularly preferably one (preferably at least from one end to the other end of the core jacket) between has two longitudinal edges of the core jacket running in the longitudinal direction of the core jacket, strip-shaped longitudinal opening, an expansion device for expanding and / or spreading and / or contracting and / or shrinking the mold core, and / or a sealing element sealing the longitudinal opening of the core jacket. The sealing element is preferably provided as a flexible and / or elastically deforming sealing element when the mold core is contracted and / or shrunk, which when the mold core is in the shrunk or contracted state, in particular by bending, in particular around a longitudinal axis, preferably turns inside (or outside), in particular relative to the kernmantle.

According to particularly expedient exemplary embodiments, one or more guide elements can be arranged on the side of the sealing element facing the interior of the mold core. According to particularly expedient exemplary embodiments, the expansion device can be set up to bring the mold core from the expanded or expanded state into the contracted or shrunk state in at least two consecutive shrinking processes. In particular, the expansion device can preferably be set up to bring the mold core from the expanded or spread state to the contracted or shrunk state in at least two consecutive shrinking processes, so that at least one driver section of the expansion device in the transition from a first shrinking process the at least two consecutive shrinking processes to a second shrinking process the at least two consecutive shrinking processes with at least one driving portion which comes into contact with one or more guide elements of the sealing element, in particular for guiding the sealing element in (or during) the second shrinking process (and possibly in or during further shrinking processes). The formulation of the two or more shrinking processes means in particular that the expansion device already partially shrinks or contracts the mold core in a first shrinking process and further shrinks or contracts the mold core from the partially shrunk or partially contracted state in at least one further shrinking process To bring the mold core into the contracted or shrunk state in the last of the at least two shrinking processes. This does not exclude that the shrinking processes continuously merge into one another, the transition from the first to at least one further second shrinking process being recognizable by at least one driver section of the expansion device in the transition from the first to the second shrinking process after partial shrinkage or contraction of the mold core comes into contact with at least one driving section of the one or more guide elements of the sealing element. In particular, this means that the at least one driver section of the expansion device is not or comes into contact with the at least one driver section of the one or more guide elements in the first shrinking process, but only after the mold core has already partially shrunk or contracted. This has the advantage that no tensile forces are exerted on the sealing element in the first shrinking process, but the sealing element can advantageously be guided in the subsequent second shrinking process. Due to the avoidance of tensile forces acting on the sealing element, this prevents excessive wear of the sealing element.

According to particularly expedient exemplary embodiments, the expansion device can furthermore be set up to intervene on the one or more guide elements in the transition from the first to the second shrinking process and / or to come into contact or entrainment contact and, in the second shrinking process, the sealing element with the one or more guide elements, in particular with the engagement and / or contact with the one or more guide elements. This has the advantage that no tensile forces are exerted on the sealing element in the first shrinking process, but the sealing element can advantageously be guided in the subsequent second shrinking process. This prevents due to the Avoidance of tensile forces acting on the sealing element and excessive wear of the sealing element.

According to particularly expedient exemplary embodiments, one or more guide elements of the sealing element can each have a spacer sleeve, in particular a respective spacer sleeve with one of the at least one driver sections, the respective driver section of the spacer sleeve preferably being spaced from the side of the sealing element facing the interior of the mold core. According to particularly expedient exemplary embodiments, the at least one driver section of the expansion device can preferably be moved inwards relative to the mold core when contracting or shrinking the mold core and / or preferably come into contact with the at least one driver section of the respective spacer sleeve of the guide elements in the transition from the first to the second shrinking process , and / or the at least one driver section of the expansion device can preferably guide and / or take along the one or more guide elements of the sealing element in the second shrinking process. This has the advantage that no tensile forces are exerted on the sealing element in the first shrinking process, but the sealing element can advantageously be guided in the subsequent second shrinking process. Due to the avoidance of tensile forces acting on the sealing element, this prevents excessive wear of the sealing element.

According to particularly expedient exemplary embodiments, the expansion device can comprise a mold element which, in the expanded or spread state of the mold core, supports the shape of the side of the sealing element facing the interior of the mold core and / or is moved inward relative to the mold core when the mold core contracts or shrinks. According to particularly expedient exemplary embodiments, the shaped element can have the at least one driver section of the expansion device. According to particularly expedient exemplary embodiments, the shaped element can be a shaped sheet metal extending in the longitudinal direction of the mold core and the at least one driver section of the expansion device can be formed by a respective hole in the shaped sheet metal, through which the respective spacer sleeve of the guide element or the one or more guide elements can extend . According to particularly expedient exemplary embodiments, the at least one driving section of the respective spacer sleeve of the guide element or the one or more guide elements can be arranged on the side of the shaped sheet metal facing away from the sealing element. According to particularly useful embodiments, the driving portion of the respective spacer sleeve of the guide element or the one or more guide elements have a distance from the side of the sealing element facing the interior of the mold core, which is preferably greater than the sheet metal thickness of the shaped sheet metal. According to particularly expedient exemplary embodiments, one or more guide elements can each have a stamp section on the side facing the sealing element, which preferably engages and / or is fitted into a groove section of the sealing element, the groove section of the sealing element particularly preferably having a substantially T-shape in cross-sectional profile . According to particularly expedient exemplary embodiments, the stamp section can engage and / or be fitted into the groove section of the sealing element in a direction transverse to the longitudinal direction of the mold core in a form-fitting manner, particularly preferably in the radial direction of the mold core and / or essentially perpendicular to the radial direction of the mold core. According to particularly expedient exemplary embodiments, the stamp section of the respective guide element can engage in the groove section of the sealing element in a displaceable manner in the longitudinal direction of the mold core. According to particularly expedient exemplary embodiments, the sealing element can have a connecting web, on which a guide strip having the groove section and extending in the longitudinal direction of the mold core is preferably arranged.

According to a further exemplary aspect, a sealing element (which can also be provided as a spare part, for example) is proposed for use on a mold core according to one of the preceding exemplary embodiments, wherein the sealing element can preferably be fastened to the respective longitudinal edges of the longitudinal opening of the core jacket by means of a releasable connection. Furthermore, one or more guide elements can be arranged on the side of the sealing element facing the interior of the mold core (in the fastened state). According to particularly useful embodiments, the sealing element or the one or more guide elements can be set up and / or designed in such a way that at least one at least one driver section of the expansion device in the transition from a first shrinking process of the at least two consecutive shrinking processes to a second shrinking process of the at least two successive ones executed shrinking processes with at least one driving section which comes or can come into contact with one or more guide elements of the sealing element (in the attached state), in particular for guiding the sealing element in (or during) the second shrinking process (and possibly in or during further shrinking processes ). According to particularly expedient exemplary embodiments, one or more guide elements of the sealing element can each have a spacer sleeve, in particular a respective spacer sleeve with one of the at least one driver sections, the respective driver section of the spacer sleeve preferably being spaced from the side of the sealing element facing the interior of the mold core. According to particularly expedient exemplary embodiments, the at least one driving section of the respective spacer sleeve of the guide element or the one or more guide elements can be arranged on the side of the shaped sheet metal facing away from or facing away from the sealing element (in the installed or attached state of the sealing element). According to particularly expedient exemplary embodiments, the driving section of the respective spacer sleeve of the guide element or the one or more guide elements from the side of the sealing element facing or facing the interior of the mold core (in the installed or fastened state of the sealing element), which is preferably greater than the sheet thickness of the shaped sheet. According to particularly expedient exemplary embodiments, one or more guide elements can each have a stamp section on the side facing the sealing element, which preferably engages and / or is fitted into a groove section of the sealing element, the groove section of the sealing element particularly preferably having a substantially T-shape in cross-sectional profile . According to particularly expedient exemplary embodiments, the stamp section can engage and / or be fitted into the groove section of the sealing element in a direction transverse to the longitudinal direction of the mold core in a form-fitting manner, particularly preferably in the radial direction of the mold core and / or essentially perpendicular to the radial direction of the mold core. According to particularly useful embodiments, the

The punch section of the respective guide element can be slidably engaged or fitted into the groove section of the sealing element in the longitudinal direction of the mold core or of the sealing element. According to particularly expedient embodiments that can

Sealing element have a connecting web, on which a guide strip having the groove section and extending in the longitudinal direction of the mold core or of the sealing element is preferably arranged.

According to a further exemplary aspect, a molding device for the production of hollow and / or in particular tubular concrete bodies is also proposed, comprising an outer shape and an inner shape that is preferably arranged and / or can be arranged in the outer shape, which is preferably a mold core according to one of the above aspects and / or exemplary embodiments includes. Further preferred, exemplary embodiments which can be combined with the above aspects are described below.

According to particularly expedient exemplary embodiments, the sealing element can be connected to the core jacket so as to be displaceable in the longitudinal direction, and particularly preferably the sealing element can be connected to the two longitudinal edges of the core jacket so as to be displaceable in each case in the longitudinal direction. This has the advantage that the sealing element can be removed easily, efficiently and inexpensively due to the sliding connection, in order to be exchanged with another sealing element (spare part) if necessary, e.g. without having to remove the mold core from the molding device.

According to particularly expedient exemplary embodiments, the sealing element can be attached to the respective longitudinal edges of the core jacket by means of a respective releasable connection. This has the advantage that the sealing element can be removed easily, efficiently and inexpensively due to the detachable connection, in order to replace it with another sealing element (spare part) if necessary, e.g. without having to remove the mold core from the molding device. According to particularly expedient exemplary embodiments, the sealing element can, in particular, be held on the mold core so that it can be pulled out of the mold core in the longitudinal direction. In particular, the sealing element on the mold core can be pulled out of the longitudinal opening of the core jacket in the longitudinal direction and / or, for example, be held so that it can be pulled out between the longitudinal edges of the core jacket, in particular be held so that it can be pulled out in the longitudinal direction at the longitudinal edges of the core jacket. This has the advantage that the sealing element can be removed easily, efficiently and inexpensively by simply pulling it out in the longitudinal direction of the mold core in order to be replaced with another sealing element (spare part) if necessary, e.g. without having to remove the mold core from the molding device.

According to particularly expedient exemplary embodiments, the sealing element can be connected with its longitudinal edges on the respective longitudinal edges of the core jacket so as to be displaceable in the longitudinal direction (in each case). In particular, respective longitudinal edges of the sealing element facing the longitudinal edges of the core jacket can each be connected to the respective longitudinal edges of the core jacket so as to be displaceable in the longitudinal direction. This has the advantage that the sealing element can be removed easily, efficiently and inexpensively due to the displaceable connection in order to be exchanged with a further sealing element (spare part) if necessary, for example without having to remove the mold core from the molding device. According to particularly expedient exemplary embodiments, the sealing element can be positively connected to (and / or with) the respective longitudinal edges of the core jacket in the direction transverse to the longitudinal direction of the mold core, particularly preferably in the essentially radial direction of the mold core and / or essentially perpendicular to the radial direction of the Mandrel relative to the mandrel. Particularly preferably, the sealing element can be positively connected to (and / or with) the respective longitudinal edges of the core jacket in essentially all directions transverse to the longitudinal direction of the mold core, particularly preferably in the essentially radial direction of the mold core inwards and / or outwards and / or substantially in both directions perpendicular to the radial direction of the mandrel relative to the mandrel. This has the advantage that the sealing element can be held (preferably sealingly) in such a way that essentially only the longitudinal direction remains as a translational degree of freedom. According to particularly expedient exemplary embodiments, the sealing element can have lateral, longitudinally extending and / or laterally fastened connecting strips, which can preferably be held displaceably in the longitudinal direction on the longitudinal edges of the core jacket, in particular on respective fastening strips fastened to the longitudinal edges of the core jacket.

According to particularly expedient exemplary embodiments, the connecting strips of the sealing element can have one or more longitudinally extending profile groove sections into which preferably respective corresponding profile rail sections of the longitudinal edges, in particular the fastening strips attached to the longitudinal edges of the core jacket, engage displaceably in the longitudinal direction. Alternatively or additionally, the connecting strips of the sealing element can have one or more profile rail sections extending in the longitudinal direction, which can preferably engage slidably in the respective corresponding profile groove sections of the longitudinal edges, in particular the fastening strips attached to the longitudinal edges of the core jacket. According to particularly expedient exemplary embodiments, one or more profile groove sections and / or their corresponding one or more profile rail sections can have a T-shape in the cross-sectional profile.

According to particularly expedient exemplary embodiments, the sealing element can have a flexibly and / or elastically bendable connecting web, which can particularly preferably comprise an elastic plastic, in particular an elastomer. According to particularly expedient exemplary embodiments, the connecting web of the sealing element can be arranged between the connecting strips of the sealing element and / or on both sides with the Connecting strips be connected. According to particularly expedient exemplary embodiments, the connecting web of the sealing element can be fastened to the connecting strips by means of a non-positive connection, particularly preferably by means of an adhesive connection. According to particularly expedient exemplary embodiments, the connecting strips of the sealing element can each have one or more retaining profile sections, in particular anchor and / or nose profile sections, protruding into and / or engaging in the material of the connecting web in the cross-sectional profile. According to particularly expedient exemplary embodiments, at least one of the connecting strips of the sealing element can have, in the cross-sectional profile, a plurality of retaining profile sections which are oriented transversely to one another and / or protrude into the material of the connecting web and / or engage.

According to a further exemplary aspect, a sealing element (which can also be provided as a spare part, for example) is proposed for use on a mold core according to one of the preceding exemplary embodiments, the sealing element or its lateral longitudinal edges (in particular, the longitudinal edges of the core jacket) being / are preferably set up for this purpose to be connected to the longitudinal edges of the core jacket so as to be displaceable in the longitudinal direction, and particularly preferably to be attachable to respective longitudinal edges of the core jacket by means of a respective releasable connection.

According to particularly expedient exemplary embodiments, the sealing element or its lateral longitudinal edges (in particular facing the longitudinal edges of the core jacket) can be designed to be connected to the core jacket so that it can be displaced in the longitudinal direction, particularly preferably the sealing element with the two longitudinal edges of the core jacket can each be displaced in the longitudinal direction be connected.

According to particularly expedient exemplary embodiments, the sealing element or its lateral longitudinal edges (in particular facing the longitudinal edges of the core jacket) can be configured to be attached to (and / or with) respective longitudinal edges of the core jacket by means of a respective releasable connection. According to particularly expedient exemplary embodiments, the sealing element or its lateral longitudinal edges (in particular facing the longitudinal edges of the core jacket) can be designed to be held in particular on the mold core such that it can be pulled out of the mold core in the longitudinal direction. In particular, the sealing element or its lateral longitudinal edges (in particular facing the longitudinal edges of the core jacket) can be configured to be able to be pulled out of the longitudinal opening of the core jacket on the mold core in the longitudinal direction and / or, for example, between the To be held pull-out longitudinal edges of the core jacket, in particular to be held pull-out in the longitudinal direction at the longitudinal edges of the core jacket.

According to particularly expedient exemplary embodiments, the sealing element can with its lateral (in particular facing the longitudinal edges of the core jacket) longitudinal edges or its lateral (in particular the longitudinal edges of the core jacket)

Longitudinal edges can be set up to be connected to (and / or with) the respective longitudinal edges of the core jacket so as to be displaceable in the longitudinal direction. In particular, respective longitudinal edges of the sealing element facing the longitudinal edges of the core jacket can each be configured to be connected to the respective longitudinal edges of the core jacket so as to be displaceable in the longitudinal direction.

Longitudinal edges be set up to be connected positively to (and / or with) the respective longitudinal edges of the core jacket in the direction transverse to the longitudinal direction of the mold core, particularly preferably in the essentially radial direction of the mold core and / or essentially perpendicular to the radial direction of the mold core relative to the mandrel. Particularly preferably, the sealing element with its lateral longitudinal edges (in particular facing the longitudinal edges of the core jacket) or its lateral longitudinal edges (in particular the longitudinal edges of the core jacket) can be set up at (and / or with) the respective longitudinal edges of the core jacket in substantially all of them Directions transverse to the longitudinal direction of the mold core in each case to be positively connected, particularly preferably in a substantially radial direction of the mold core inward and / or outward and / or substantially in both directions perpendicular to the radial direction of the mold core relative to the mold core. According to particularly expedient exemplary embodiments, the sealing element can have lateral, longitudinally extending (for example, along the longitudinal edges of the sealing element and / or the longitudinal edges of the sealing element) and / or laterally attached connecting strips, which are preferably set up on the longitudinal edges of the core jacket, in particular to be held displaceably in the longitudinal direction on respective fastening strips attached to the longitudinal edges of the core jacket.

According to particularly expedient exemplary embodiments, the connecting strips of the sealing element can have one or more profile groove sections extending in the longitudinal direction have, in which preferably respective corresponding profile rail sections of the longitudinal edges, in particular of the fastening strips attached to the longitudinal edges of the core jacket, can engage displaceably in the longitudinal direction. Alternatively or additionally, the connecting strips of the sealing element can have one or more profile rail sections extending in the longitudinal direction, which can preferably engage slidably in the respective corresponding profile groove sections of the longitudinal edges, in particular the fastening strips attached to the longitudinal edges of the core jacket. According to particularly expedient exemplary embodiments, one or more profile groove sections and / or their corresponding one or more profile rail sections can have a T-shape in the cross-sectional profile.

According to particularly expedient exemplary embodiments, the sealing element can have a flexibly and / or elastically bendable connecting web, which can particularly preferably comprise an elastic plastic, in particular an elastomer. According to particularly expedient exemplary embodiments, the connecting web of the sealing element can be arranged between the connecting strips of the sealing element and / or connected to the connecting strips on both sides. According to particularly expedient exemplary embodiments, the connecting web of the sealing element can be fastened to the connecting strips by means of a non-positive connection, particularly preferably by means of an adhesive connection. According to particularly expedient exemplary embodiments, the connecting strips of the sealing element can each have one or more retaining profile sections, in particular anchor and / or nose profile sections, protruding into and / or engaging in the material of the connecting web in the cross-sectional profile. According to particularly expedient exemplary embodiments, at least one of the connecting strips of the sealing element can have, in the cross-sectional profile, a plurality of retaining profile sections which are oriented transversely to one another and / or protrude into the material of the connecting web and / or engage.

According to a further exemplary aspect, a molding device for the production of hollow and / or in particular tubular concrete bodies is also proposed, comprising an outer shape and an inner shape that is preferably arranged and / or can be arranged in the outer shape, which is preferably a mold core according to one of the above aspects and / or exemplary embodiments includes.

Further aspects and their advantages as well as advantages and more specific implementation options of the aspects and features described above are identified in the following, but in no way restrictive, descriptions and explanations of the attached figures.

BRIEF DESCRIPTION OF THE FIGURES FIG. 1 shows an exemplary perspective illustration of a molding device for producing tubular concrete bodies according to an exemplary embodiment of the present invention,

FIG. 2 shows an exemplary top view of the exemplary molding device according to FIG. 1,

FIG. 3 shows an exemplary cross-sectional illustration of the exemplary molding device according to FIG. 1 (section A-A according to FIG. 2),

4 shows an exemplary perspective illustration of a mold core of a molding device for producing tubular concrete bodies according to an exemplary embodiment of the present invention,

FIG. 5 shows an exemplary top view of the exemplary mold core according to FIG. 4, FIG. 6 shows an exemplary longitudinal sectional view of the exemplary mold core according to FIG. 3 (section B-B according to FIG. 5),

7 shows an exemplary perspective illustration of an exemplary expansion device of a mold core of a molding device for the production of tubular concrete bodies according to an exemplary embodiment of the present invention, FIG. 8 shows an exemplary front view of the exemplary expansion device according to FIG. 7,

FIG. 9 shows an exemplary top view of the exemplary expansion device according to FIG. 7,

FIG. 10 shows an exemplary longitudinal side view of the exemplary expansion device according to FIG. 7,

FIG. 11 shows an exemplary cross-sectional view of the exemplary expansion device according to FIG. 7 (section C-C according to FIG. 10),

12A shows an exemplary profile view of a sealing element for use on a mold core according to an exemplary embodiment of the present invention, 12B shows an exemplary profile view of a sealing element for use on a mold core according to a further exemplary embodiment of the present invention,

12C shows an exemplary profile view of a sealing element for use on a mold core according to a further exemplary embodiment of the present invention and

12D shows an exemplary profile view of a sealing element for use on a mold core according to a further exemplary embodiment of the present invention.

Detailed description of the figures and preferred exemplary embodiments

In the following, preferred examples and / or exemplary embodiments of the present invention are described in detail with reference to the accompanying figures. Identical and / or similar elements in the figures can be designated with the same reference symbols, but sometimes also with different reference symbols. It should be emphasized that the present invention is, however, in no way limited and / or restricted to the exemplary embodiments described below and their design features, but rather further comprises modifications of the exemplary embodiments, in particular those that result from modifications of the features of the described examples and / or by Combination of one or more of the features of the examples described are included within the scope of protection of the independent claims.

1 shows an exemplary perspective illustration of a molding device 1000 for producing tubular concrete bodies according to an exemplary embodiment of the present invention. FIG. 2 shows an exemplary top view of the exemplary molding device 1000 according to FIG. 1. FIG. 3 shows an exemplary cross-sectional illustration of the exemplary molding device 1000 according to FIG. 1 (section AA from FIG. 2). By way of example, the forming device 1000 is set up here to produce cylindrical concrete pipes which have an essentially circular cross-section with a wall thickness that is essentially constant over the circumference (ie, for example, with essentially coaxial circular inner and outer cross-sectional shapes). However, further embodiments with other internal and / or external shapes can be provided in which hollow and / or tubular concrete bodies can be produced, the external and / or internal shape of which differs in cross-section from the circular shape, e.g. with oval, elliptical, angular (possibly . With rounded corners) Cross-sectional shapes outside and / or inside and / or with inner and / or outer shape centers deviating from the coaxial arrangement. The molding device 1000 of the embodiment according to FIGS. 1, 2 and 3 comprises, by way of example, a stand section 100 on which an external mold 200 comprising two external mold sections 210 and 220 is arranged. Here, purely by way of example, the two outer shape sections 210 and 220 are essentially designed as semi-hollow cylindrical elements which, when put together, form the hollow cylindrical outer shape 200, for example. In further exemplary embodiments, the outer shape can be composed of two or more identical and / or differently shaped outer shape sections. The outer shape sections 210 and 220 of the outer shape 200 of the exemplary embodiment according to FIGS. 1 and 2 are arranged by way of example on respective slide sections 211 and 221. By means of the slide sections 211 and 221 mounted displaceably on rails 110 and 120 arranged by way of example on the stand section 100, the outer mold sections 210 and 220 for demolding a concrete body B produced by the molding device 1000 from the set-up state shown in FIG. 1 can be separated and / or moved away from one another are moved to release the concrete body located therein. In the set-up process, for example before the next concrete casting process, the outer mold sections 210 and 220 can be moved towards one another and / or brought together again in order to be assembled and / or fastened to one another in the set-up state shown as an example in FIG. 1. In the set-up state, the inner wall of the outer mold sections 210 and 220 essentially forms a cylindrical shape (Flohl cylinder inner wall), which at least partially shapes the outer wall of the concrete body to be produced.

The molding device 1000 of the embodiment according to FIGS. 1, 2 and 3 furthermore comprises, for example, a mold core 300 that forms the inner shape. The mold core 300 and / or its outer shape, for example, essentially forms a (standing) cylindrical shape which at least partially shapes the inner wall of the concrete body B to be produced. In the concrete casting process, in the set-up state of the molding device 1000 shown by way of example in FIG. 1, concrete can be poured into the space formed between the outer mold 200 and the mold core 300 in order to form the concrete body B to be produced (see, for example, FIGS. 2 and 3). By way of example, the molding device 1000 is used to form essentially cylindrical concrete pipes in an upright position. The mold core 300 of the molding device 1000 is designed as a shrink core, which has an expansion device 400 (expanding and / or shrinking device) arranged in the hollow cylindrical interior of the mold core 300 (see FIG. 2, not shown in FIGS. 1 and 3). The expansion device 400 extends by way of example inside the mold core 300, in particular by way of example in the longitudinal direction of the mold core 300, ie in the present exemplary embodiment vertically in the case of the example standing Mold core 300 in FIG. 1. The longitudinal direction of the mold core is defined here, for example, by the longitudinal direction of the hollow and / or tubular concrete bodies or concrete pipes to be produced. The expansion device 400 is set up, by way of example, to spread (expand) the mold core 300 in order to form the set-up state for the concrete casting process and / or to shrink (contract) the mold core 300 for demoulding the concrete body B.

It should be noted, however, that in the present exemplary embodiment, essentially cylindrical concrete pipes can be poured upright only by way of example. However, further exemplary embodiments are possible in which the outer shape and / or the inner shape, ie for example the inner mold core, of the molding device deviate from the cylindrical shape and / or the essentially circular cross section. For example, it is possible to manufacture concrete pipes with an oval cross-section or an angular (triangular, square, pentagonal and with more corners) cross-section, possibly with rounded corners, whereby the outer shape and / or the mold core in cross-section is adapted to the desired shape of the to be produced concrete body is adapted. Thus, embodiments with mold cores with an oval cross-section or an angular cross-section, possibly with rounded corners, are also possible. Consequently, further embodiments with other internal and / or external shapes can be provided in which hollow and / or tubular concrete bodies can be produced whose external and / or internal shape deviates from the circular shape in cross-section, e.g. with oval, elliptical, angular (possibly . With rounded corners) Cross-sectional shapes outside and / or inside and / or with inner and / or outer shape centers deviating from the coaxial arrangement. Here, the cross-sectional shape of the inner wall of the outer shape and / or the cross-sectional shape of the outer wall of the mold core or the inner shape can differ from the circular shape. Furthermore, it is possible to provide external and / or internal shapes, the cross-sectional shape and / or cross-sectional size of which change in the longitudinal direction. In further exemplary embodiments, the outer mold 200 can, for example, comprise a cover element, possibly a circular and / or ring-shaped cover element, which covers the concrete body B hardening in the mold from above after the casting process, and / or a tensioning device that holds the outer mold 200 and the Inner mold and / or the mold core 300 in the set-up state and / or fastened for the casting process in an exciting manner. In this exemplary embodiment, the expansion device 400 is hydraulically controlled and / or can be operated hydraulically, in further exemplary embodiments, in addition to one or more hydraulic mechanisms, other mechanisms can also be used as an additional or alternative, for example by means of a mechanical, hydraulic, pneumatic and / or electrical and / or or electromagnetic control. 4 shows an exemplary perspective illustration of a mold core 300 of a molding device 1000 for producing hollow and / or in particular tubular concrete bodies according to an exemplary embodiment of the present invention. By way of example, the mold core 300 in the molding device 1000 according to FIGS. 1 to 3 can be used. By way of example, the mold core 300 has the expansion device 400 inside, analogously to FIG. 2. The mold core 300 comprises, for example, a substantially cylindrical core jacket 310 (can also be referred to as a mold jacket or mold core jacket), which extends, for example, on one side in the longitudinal direction of the mold core 300, from one end to the other end of the mold core 300 and / or over the entire length of the mold core 300 Has the length of the mold core extending, strip-shaped opening (longitudinal opening), on which, for example, a strip-shaped sealing element 500 that seals and / or closes the opening is arranged. For example, the strip-shaped sealing element 500 extends (preferably at least) essentially from one end to the other end of the mold core 300, in particular in the longitudinal direction of the mold core, and / or for example (preferably at least) over the entire length of the mold core 300 along the longitudinal opening of the core jacket 310 , especially in the longitudinal direction of the mandrel. The strip-shaped sealing element 500 has on its longitudinal edges, for example, connecting strips 511 and 512 which extend in the longitudinal direction and which the sealing element 500 with the respective longitudinal edges 311 and 312 of the strip-shaped longitudinal opening of the core jacket

Connect 310 and / or attach to these in a sealing manner. 4 shows the mold core 300 in the spread and / or expanded state in which the core jacket 310 is expanded, for example in such a way that the longitudinal edges 311 and 312 of the strip-shaped longitudinal opening of the core jacket 310 are pressed apart, in particular controlled and / or driven by, for example The expansion device 400. In Fig. 4, fastening elements 321 to 324 are shown on the underside of the mold core 300 by way of example, with which the mold core 300 can be fastened standing on and / or on the stand section 100 of the molding device 1000 between the outer mold sections 210 and 220 of the outer mold 200 is.

FIG. 5 shows an exemplary top view of the exemplary embodiment of the mold core 300 according to FIG. 4. In particular, the exemplary expansion device 400 arranged by way of example inside the mold core 300 is shown (e.g. analogous to FIG. 2). The expansion device 400 is operated hydraulically, for example, and is set up, for example, to spread and / or expand the mold core 300, for example by removing the longitudinal edges

311 and 312 of the core jacket 310 can be pressed apart by an expansion mechanism of the expansion device 400, for example hydraulically controlled, or moved apart by expansion of the core jacket 310. The opposite is the case Expansion device 400 is set up, for example, to shrink and / or contract the mold core 300 by the longitudinal edges 311 and 312 being moved towards one another and / or towards one another in a hydraulically controlled manner by the expansion mechanism of the expansion device 400, for example, or by contracting the core jacket 310 be moved. 5 shows, by way of example, the expanded and / or spread state of the mold core 300, the longitudinal edges 312 and 312 of the strip-shaped longitudinal opening of the core jacket 310 being pressed apart by way of example. Between the longitudinal edges 311 and 312 of the longitudinal opening of the core jacket 310, the sealing element 500, which seals the mold core 300 from the outside inwards against the ingress of liquid, is arranged, for example, on the longitudinal sides of which the connecting strips 511 and 512, the sealing element 500 with the respective longitudinal edges 311 and 312 of the Connect the longitudinal opening of the core jacket 310 in a sealing manner. An exemplary expansion mechanism of the expansion device 400 and its exemplary mode of operation according to an exemplary embodiment is shown in FIGS. 6 to 11 described in more detail.

FIG. 6 shows an exemplary longitudinal sectional illustration of the exemplary mold core 300 according to FIG. 3 (section B-B according to FIG. 5). FIG. 6 shows, by way of example, the expansion device 400 in the interior of the mold core 300, the expansion device 400 extending, for example, in the longitudinal direction from one end of the mold core 300 to the other end. By way of example, the expansion device 400 comprises two hydraulically actuated expansion mechanisms 400A and 400B of identical construction at different positions inside the mold core 300. In further exemplary embodiments, only one or more than two expansion mechanisms can also be provided, e.g. also depending on the length of the mold core. The expansion mechanisms 400A and 400B are each set up, for example, to move the sword element 410 of the expansion device 400, which for example extends in the longitudinal direction, for example in the radial direction of the essentially cylindrical core jacket 310. The further exemplary mode of operation of the expansion device 400 and / or expansion mechanisms 400A and 400B is described in the following with the aid of an exemplary embodiment, merely by way of example.

7 shows an exemplary perspective illustration of an exemplary expansion device 400 of a mold core 300 of a molding device 1000 for producing hollow and / or in particular tubular concrete bodies according to an exemplary embodiment of the present invention. As described above, the expansion device 400 comprises, by way of example, two hydraulically actuatable expansion mechanisms 400A and 400B. It can be in In further exemplary embodiments, only one or more than two expansion mechanisms can also be provided, for example also depending on the length of the mold core.

FIG. 8 shows an exemplary front view of the exemplary expansion device 400 according to FIG. 7, in particular, by way of example, in the spread and / or expanded state. 9 shows an exemplary top view of the exemplary expansion device 400 according to FIG. 7. FIG. 10 shows an exemplary longitudinal side view of the exemplary expansion device 400 according to FIG. 7. The expansion device 400 comprises, for example, two fastening strips 421 and 422 extending parallel to one another in the longitudinal direction, which, for example, can be fastened and / or fastened in a parallel arrangement to the parallel extending longitudinal edges 311 and 312 of the strip-shaped longitudinal opening of the core jacket 310 (see, for example, FIGS. 4 and 5). The expansion mechanisms 400A and 400B are each fastened by way of example on both sides in the longitudinal direction one behind the other via respective screw connections S1 and S2 to the fastening strips 421 and 422 and / or screw-connected to them. In the exemplary embodiment, the fastening strips 421 and 422 serve merely as an example as a means for fastening the expansion device 400 to the core jacket 310 or to the longitudinal edges 311 and 312 of the core jacket 310, and also merely by way of example for fastening or connecting the sealing element 500 or the connecting strips 511 and 512 of the sealing element 500 on / with the longitudinal edges 311 and 312 of the strip-shaped longitudinal opening of the core jacket 310 (see, for example, FIG. 5).

The expansion mechanism of the expansion device 400 shown in FIG. 8 (and analogously the expansion mechanisms 400A and 400B of identical construction) comprises, for example, a hydraulic cylinder 430, the hydraulically controllable piston 431 of which, for example, has a lever element 440 extending transversely to the piston 431 and transversely to the longitudinal direction of the expansion device 400 is connected, in particular by way of example via a screw connection S3. On the side of the hydraulic cylinder 430 facing away from the lever element 440, the hydraulic cylinder 430 and / or a carrier element 470 carrying the hydraulic cylinder 430 is connected, for example, to the sword element 410 extending transversely to the axis of the hydraulic cylinder 430. Push rod elements 451 and 452 are fastened by way of example to both end sections 441 and 442 of the lever element 440 and / or to both opposite sides of the lifting element 440. By way of example, the push rod elements 451 and 452 are connected at both ends by means of swivel joints Lll and L12 and at the swivel joints Lll and L12 by an essentially perpendicular to the push rod elements 451 and 451 and / or parallel to the longitudinal direction of the Expansion device 400 aligned respective axes of rotation rotatably and / or pivotably mounted and / or held. The push rod elements 451 and 452 extend, for example, parallel to one another and parallel to the piston 431 of the hydraulic cylinder 430 and / or parallel to the axis of the hydraulic cylinder 430, which is oriented transversely to the longitudinal direction of the expansion device 400 Ends and / or on the side facing away from the lever element 440 are connected to respective fastening sections 461 and 462, the fastening sections 461 and 462 being each connected to the fastening strips 421 and 422, for example, and / or being fastened to these opposite one another via the screw connections S1 and S2. Furthermore, by way of example, respective spacer elements 481 and 482 are fastened to the fastening sections 461 and 462 by means of swivel joints L31 and L32, the respective other ends of the spacer elements 481 and 482 being fastened to the sword element 410 on opposite sides in the transverse direction of the sword element 410 via respective swivel joints L41 and L42 . For example, the spacer elements 481 and 482 are each mounted and / or pivotable on the swivel joints L31, L32, L41 and L42 about a respective axis of rotation that is essentially perpendicular to the push rod elements 451 and 452 and / or parallel to the longitudinal direction of the expansion device 400 held. The spacer elements 481 and 482 are always aligned with their own longitudinal direction, for example, always transversely to the longitudinal direction of the expansion device 400. It should be mentioned at this point that the longitudinal direction of the expansion device 400 in FIG. 8 is arranged, for example, perpendicular to the plane of the drawing. Because of the rotatable mounting on the joints L31, L32, L41 and L42, the spacer elements 481 and 482 can on the one hand be pivoted relative to one another and also be pivoted relative to the push rods 451 and 452 at the same time.

In the exemplary spread position of the expansion device 400 (spread and / or expanded state) shown in FIG. 8, the spacer elements 481 and 482 are aligned, for example, with their own longitudinal direction parallel and / or axially to one another and, for example, transversely to the push rods 451 and 452. Due to the axial alignment with one another, the joints L31 to L41 and / or L32 to L42 (and thus the joints L31 to L32) are at a maximum distance from one another on both sides of the expansion mechanism 400. Thus, in the state shown in FIG. 7, the opposing fastening sections 461 and 462 are, for example, maximally spaced from one another and the fastening strips 421 and 422 (and thus also the longitudinal edges 311 and 312 of the core jacket 310 fastened to them) are pressed apart maximally spaced. This causes the core jacket 310 to spread and / or is expanded. In order to shrink and / or contract the mold core 300, eg for the demoulding process, the hydraulic cylinder 430 can be actuated to retract the piston 431 so that the sword element 410 is moved towards the lever element 440, ie in particular in the inward direction relative to the mold core 300. This also leads to a movement of the sword element 410 relative to the fastening sections 461 and 462 and / or the fastening strips 421 and 422, so that the spacer elements 481 and 482 against each other and relative to the fastening sections 461 and 462 and the sword element 410 can be pivoted. Due to the pivoting of the spacer elements 481 and 482, the distance between the fastening sections 461 and 462 is reduced compared to the spread position shown in FIG. 8, so that the fastening strips 421 and 422 connected to the fastening sections 461 and 462 and / or the longitudinal edges fastened to them 311 and 312 of the core jacket 310 are drawn together and the distance between the longitudinal edges 311 and 312 of the core jacket 310 is reduced over the entire length of the core jacket 310. This leads to the desired shrinkage of the mold core 300 in order to facilitate the demolding of the concrete body B.

In FIG. 8, the fastening of the exemplary sealing element 500 is also shown by way of example. The sealing element 500 is fastened, for example, to the respective fastening strips 421 and 422 by means of the connecting strips 511 and 512 of the sealing element 500 and / or connected to them in a sealing manner. In the exemplary embodiment, the fastening strips 421 and 422 serve merely as an example as a means for fastening the expansion device 400 to the core jacket 310 or to the longitudinal edges 311 and 312 of the core jacket 310, and also merely by way of example for fastening or connecting the sealing element 500 or the connecting strips 511 and 512 of the sealing element 500 on / with the longitudinal edges 311 and 312 of the strip-shaped longitudinal opening of the core jacket 310 (see, for example, FIG. 5). In particular, the profiles of the connecting strips 511 and 512 of the sealing element 500 have, for example, groove sections 511a and 512a running in the longitudinal direction, which for example have a T-shape in cross-sectional profile (see also FIGS. 12A to 12D). The fastening strips 421 and 422 have, for example, corresponding profile rails 421a and 422a running in the longitudinal direction, which are designed to engage in the respective groove sections 511a and 512a of the connecting strips 511 and 512 of the sealing element 500 and / or to be pushed into them in the longitudinal direction, see above that the profile rails 421a and 422a, for example having a T-shape in profile, are each fastened to the groove sections 511a and 512a and / or to the connecting strips 511 and 512 of the sealing element 500 and / or are sealingly connected to them. The connecting strips 511 and 512 of the Sealing element 500 as well as the profile rails 421a and 422a of the fastening strips 421 and 422 run, for example, in the longitudinal direction parallel to the longitudinal edges 311 and 312 of the core jacket 310 and are preferably mutually displaceable in the longitudinal direction, but preferably connected in a form-fitting manner in the transverse direction and / or transverse to the longitudinal direction. In particular, the connecting strips 511 and 512 of the sealing element 500 are, for example, each connected to the fastening strips 421 and 422 so as to be displaceable in the longitudinal direction, with the movement transverse to the longitudinal direction preferably being blocked in a form-fitting manner (that is, for example, a remaining translational degree of freedom). This has the advantage that the sealing element 500 can be exchanged easily and inexpensively, for example in the event of wear and tear, in that the sealing element 500 is held on the fastening strips 421 and 422 such that it can be pulled out in the longitudinal direction. For example, the sealing element 500 can advantageously simply be pulled out of the longitudinal opening of the core jacket 310 in the longitudinal direction and an identical sealing element 500 and / or a sealing element having similar connecting strips 511 and 512 can be inserted in the longitudinal direction.

The sealing element 500 is set up, for example, to seal the interior of the mold core 300 in the concrete casting process and to prevent the penetration of liquid into the interior of the mold core 300. For this purpose, the sealing element 500 has, for example, a connecting web 520 arranged between the connecting strips 511 and 512 and connected to the connecting strips 511 and 512, which, for example, is flexible and / or preferably elastically bendable (particularly preferably bendable or deformable about a longitudinal axis of the sealing element 500 ). For example, the connecting web 520 can consist of an elastically bendable or elastically formable material, such as, for example, an elastic plastic, and / or comprise a section consisting of an elastically bendable material, such as, for example, an elastic plastic. In preferred exemplary embodiments, the connecting web 520 comprises an elastomer and / or the connecting web 520 consists of elastomer.

In the expanded state shown as an example in FIG. 8, the round shape of the elastic connecting web 520 (see also FIG and / or the side facing away from the hydraulic cylinder 430) is attached (see, for example, also FIG. 6). When the sword element 410 is pulled inwards by means of the expansion device 400 during the shrinking of the mold core 300, the molded sheet 490 also lifts off the elastic connecting web 520 of the sealing element 500 and is pulled inwards, for example. In addition (as described above by way of example) the Longitudinal edges 311 and 312 of the core jacket 310 are pressed together by way of example, so that the connecting strips 511 and 512 of the sealing element 500 are also pressed together by way of example. During the shrinking of the mold core 300, this furthermore leads, for example, to an inward bending of the elastic connecting web 520 of the sealing element 500. The outward bending of the elastic connecting web 520 of the sealing element 500 is prevented in this process (eg when removing the formwork from a hardened concrete body) by the inner surface of the hardened concrete body B lying on the outside of the sealing element 500. This results in the technical advantage that the sealing element 500 and / or the flexibly and / or elastically bendable connecting web 520 of the sealing element 500 is not pulled inwards, but with the advantageous avoidance of tensile forces acting on the connecting web 520 by pushing together the longitudinal edges 311 and 312 of the core jacket 310 is bent inward. Due to the avoidance of tensile forces acting on the sealing element 500, this advantageously leads to less stress on the sealing element 500 and / or the flexibly and / or elastically bendable connecting web 520 of the sealing element 500 and thus to an improvement in the wear behavior and / or to the advantageous avoidance of above-average Signs of wear on the sealing element 500 and / or on the connecting web 520 of the sealing element 500. Should the sealing element 500 nevertheless wear out after repeated use and / or after a large number of casting processes and / or shrinking processes, e.g. through cracking, it can nevertheless quickly according to the description above can be exchanged efficiently, inexpensively and easily. Overall, there is a significant improvement in the service life of the molding device 1000 due to the lower wear of the sealing element 500 on the one hand and the simpler and / or faster replacement option of the sealing element 500 on the other hand.

FIG. 11 shows an exemplary cross-sectional view of the exemplary expansion device 400 according to FIG. 7 (section CC according to FIG. 10). The illustration is analogous to FIG. 8 through the top view of the expansion mechanism 400B. As an example, however, bores 421b and 422b are shown on the fastening strips 421 and 422, to which the fastening strips 421 and 422 (and thus the expansion device 400) can be fastened to fastening strips on the longitudinal edges 311 and 312 of the core jacket 310. In addition, an exemplary guide element 600D is shown in FIG. 11. Such guide elements 600A to 600E are held, for example, one behind the other in the longitudinal direction at several positions in the center of the guide plate 490 (see also FIGS. 6 and 7), in particular at respective bores in the shaped plate 490 (see FIG. 11). The guide element 600D has for example, on the side of the shaped sheet metal 490 facing the sealing element 500, a punch section 601 which is fastened, for example, with a screw 602 extending through the respective bore of the shaped sheet metal 490. For example, the screw 602 also extends through a spacer sleeve 603, which also extends, for example, through the respective bore of the shaped plate 490, but on the side of the shaped plate 490 facing away from the sealing element 500, for example, has an enlarged diameter driver portion 603a.

The sealing element 500 has, for example, in the center on the side facing the interior of the mold core 300, for example, a profile strip 530 extending in the longitudinal direction, which is fastened, for example, to the connecting web 520 of the sealing element 500. The profile strip 530 has, for example, a receiving groove 530a, which is open inward toward the inside of the mold core, for the punch sections 610 of the guide elements 600A to 600E (see also FIG. 12). The receiving groove 530a of the profile strip 530 has, for example, a T-shape in the cross-sectional profile (see e.g. also Fig. 12), which is adapted, for example, to the cross-sectional profile of the punch section 601 of the guide elements 600A to 600E. If, in the process of shrinking the mold core 300, the sword element 410 and thus also the molded sheet 490 is drawn radially into the interior of the mold core 300, the molded sheet 490 moves inward and lifts off the connecting web 520 of the sealing element 500. Here, the shaped sheet 490 moves inward (upward in Fig. 10) a stroke distance preset, for example, with the length of the spacer sleeve 603 and / or the screw length of the screw 602, until the top of the shaped sheet 490 comes into contact with the driver section 603a of the spacer sleeve 603 comes and takes the spacer sleeve 603 and / or the driver section 603a of the spacer sleeve 603 with it, so that after the movement of the exemplarily preset stroke distance (without tensile forces acting on the sealing element 500) the guide elements 600A to 600E carried along by the shaped sheet 490 via the in the profile strip 530 introduced punch sections 601 guide the sealing element 500 and / or its bending inward in the shrinking process.

According to the above exemplary embodiments, the expansion device is hereby set up, for example, to carry out the shrinking process in two steps and / or two-stage shrinking, in particular with preferably a single continuous stroke movement of the mechanism driving both shrinking steps, here, for example, by the hydraulic cylinder 430. eg first stage of the continuous shrinking process) the sword element 410 and thus also the shaped sheet 490 retracted radially into the interior of the mold core 300, the shaped sheet 490 moving inward and lifting off the connecting web 520 of the sealing element 500, for example without exerting tensile force on the sealing element 500 in this first step. When the continuous lifting movement is continued by the single and / or the same drive (for example the hydraulic cylinder), the top of the shaped sheet 490 comes into contact with the driver section 603a of the spacer sleeve 603 (transition to the second step and / or to the second stage of the continuous shrinking process) and the shaped sheet 490 then, for example, takes the spacer sleeve 603 and / or the driver portion 603a of the spacer sleeve 603 with it in the second step, so that in the second step, the sealing element 500 is now additionally carried along with the shrinking movement of the mandrel 300 driven by the same drive mechanism, for example. Consequently, in this exemplary embodiment there is the technical advantage that the sealing element 500 and / or the flexibly and / or elastically bendable connecting web 520 of the sealing element 500 is not pulled inwards, but rather with the advantageous avoidance of tensile forces acting on the connecting web 520 by pushing the Longitudinal edges 311 and 312 of the core jacket 310 is bent inwards, the bending of the sealing element 500 also being advantageously guided by the guide elements 600A to 600E and kept in the shrunk state.

Due to the avoidance of tensile forces acting on the sealing element 500, despite the advantageous guidance by the guide elements 600A to 600E, there is advantageously less stress on the sealing element 500 and / or the flexibly and / or elastically bendable connecting web 520 of the sealing element 500 and thus an improvement in the Wear behavior and / or an advantageous avoidance of above-average signs of wear on the sealing element 500 and / or on the connecting web 520 of the sealing element 500. Should the sealing element 500 nevertheless be worn after repeated use and / or after a large number of casting processes and / or shrinking processes, e.g. due to the formation of cracks , it can nevertheless be exchanged quickly, efficiently, inexpensively and simply according to the description above, with the stamp sections 601 of the guide elements 600A to 600E additionally in this case when the sealing element 500 is pushed in in the axial direction be inserted into the receiving groove 530a of the profile strip 530 (guide strip) of the sealing element 500. Overall, there is a significant improvement in the service life of the molding device 1000 due to the lower wear of the sealing element 500 on the one hand and the simpler and / or more simple faster replacement of the sealing element 500 with simultaneous excellent guidance of the bending process on the other hand.

12A shows an exemplary profile view of a sealing element 500 for use on a mold core 300 according to an exemplary embodiment of the present invention. The sealing element 500 preferably has a strip-shaped shape, the longitudinal edges of the strip-shaped sealing element 500 being provided, for example, with the connecting strips 511 and 512, which are located opposite one another on the flexibly and / or elastically bendable (preferably strip-shaped) connecting web 520 arranged between the connecting strips 511 and 512 of the sealing element 500 are attached, for example by means of an adhesive connection or at least supported by an adhesive connection. By way of example, the connecting strips 511 and 512 have the receiving grooves 511a and 512a, which are open laterally to the outside, for receiving the rail profiles 421a and 422a of the fastening strips 421 and 422 for sealing attachment to the mold core 300 and / or to the core jacket 310. The receiving grooves 511a and 512a have, for example, a T-shape in cross-sectional profile. In the center, the sealing element 500 also has, for example, a profile strip 530 extending in the longitudinal direction, which is fastened, for example, to the connecting web 520 of the sealing element 500. The profile strip 530 has, for example, an outwardly open receiving groove 530a for receiving the punch sections 610 of the guide elements 600A to 600E described above.

For example, the profile strip 530 is embedded in the connecting web 520 of the sealing element 500 in such a way that the outside of the profile bar 530, for example, ends with the outside of the connecting web 520 of the sealing element 500 and does not and / or does not protrude substantially beyond it. Here, the profile strip 530 can be connected to the connecting web 520 of the sealing element 500 by means of a force-fit connection (eg adhesive connection) or at least supported by a force-fit connection. In addition, the profile strip 530 has, for example, laterally protruding profile webs 530b in order to strengthen the connection between the profile strip 530 and the connecting web 520 and to avoid and / or prevent the connection from being torn off when the connecting web 520 is repeatedly bent. To reinforce the connection between the connecting web 520 and the connecting strips 511 and 512 and in particular to reduce the risk of tearing off in the edge region of the connecting web 520, the connecting strips 511 and 512 can also use, for example, profile sections protruding into the material of the connecting web 520 (possibly analogous to the profile webs 530b of the profile strip 530). This improves the longevity of the Connection of the connecting web 520 to the connecting strips 511 and 512 over the entire length of the sealing element 500 and thus prevents partial tearing at the edges, even if the sealing element 500 is used multiple times in shrinking and / or expansion processes on the mold core 300.

12B shows an exemplary profile view of a sealing element 500 for use on a mold core 300 according to a further exemplary embodiment of the present invention. The features from FIG. 12A are taken up here by way of example. To reinforce the connection of the connecting web 520 with the connecting strips 511 and 512 and in particular to reduce the risk of tearing in the edge region of the connecting web 520, the connecting strips 511 and 512 have, for example, respective anchor profile sections 511b and 512b protruding into the material of the connecting web 520. This improves the longevity of the connection between the connecting web 520 and the connecting strips 511 and 512 over the entire length of the sealing element 500 and thus prevents partial tearing at the edges, even if the sealing element 500 is used multiple times in shrinking and / or expansion processes on the mold core 300

12C shows an exemplary profile view of a sealing element 500 for use on a mold core 300 according to a further exemplary embodiment of the present invention. Here, the features from FIG. 12B are taken up by way of example, with the profile strip 530 being dispensed with by way of example (elements 600A to 600E can then be left out in the expansion device). To reinforce the connection of the connecting web 520 with the connecting strips 511 and 512 and in particular to reduce the risk of tearing in the edge region of the connecting web 520, the connecting strips 511 and 512 again have, for example, respective anchor profile sections 511b and 512b protruding into the material of the connecting web 520. In addition, the connecting strips 511 and 512 have, for example, respective nose profile sections 511c and 512c which protrude into the material of the connecting web 520 and which, for example, protrude transversely to the anchor profile sections 511b and 512b into the material of the connecting web 520. This improves the longevity of the connection of the connecting web 520 with the connecting strips 511 and 512 over the entire length of the sealing element 500 and thus leads to an improved avoidance of partial tearing at the edges, even when the sealing element 500 is used multiple times in shrink and / or Expansion processes on the mold core 300. 12D shows an exemplary profile view of a sealing element 500 for use on a mold core 300 according to a further exemplary embodiment of the present invention. Here, the features from FIG. 12C are taken up by way of example, with the profile strip 530 being provided by way of example analogously to FIG. 12A.

In exemplary embodiments, the sealing elements for good formability are preferably designed such that their cross-sectional width is essentially at least four times, in particular at least five times, greater than the cross-sectional height of the connecting web, particularly preferably at least eight times greater than the cross-sectional height of the connecting web. In the above exemplary embodiments, the cross-sectional width is essentially ten times greater than the cross-sectional height of the connecting web.

In the above exemplary embodiments, an expansion device 400 and a sealing element 500 were shown on the mold core 300. However, in further exemplary embodiments it is additionally possible to provide a mold core with a core jacket with a plurality of longitudinal openings and a plurality of sealing elements sealing the respective longitudinal openings. For example, in the case of an oval core jacket shape, both opposite sides of the core jacket can be provided with a respective expansion device and / or a respective sealing element. In the case of angular kernmantle cross-sections (triangular, square, pentagonal, ..., polygonal; e.g. with rounded corners), several and / or all sides between two corners of the kernmantle cross-section can be provided with appropriate expansion devices and / or sealing elements. Embodiments of the present invention have been described and proposed above, so that, in view of the disadvantages of the known state of the art, mold cores according to the invention for molding devices for the production of hollow and / or in particular tubular concrete bodies and accessories and spare parts (e.g. the sealing elements described) are proposed for such mold cores and / or can be provided in which an inexpensive arrangement that reliably seals the core shroud inward can also be provided, which also enables improved service life, is able to reduce material fatigue and / or wear and / or simpler handling in the event of material fatigue and / or wear permitted. It should again be pointed out that above only examples and / or exemplary embodiments of the present invention and their advantages have been described in detail with reference to the accompanying figures. It should again be emphasized that the present invention is in no way based on the exemplary embodiments described above and their design features and / or their described Combinations is limited and / or restricted, but also includes modifications of the exemplary embodiments, in particular those that result from modifications of the features of the described examples and / or from combinations and / or partial combinations of one or more of the features of the described examples within the scope of protection of the independent claims are included.

Claims

1. Molding core for use on a molding device for the production of hollow, in particular tubular, concrete bodies, comprising:

- A core jacket (310) extending in the longitudinal direction, which has a strip-shaped longitudinal opening extending in the longitudinal direction of the core jacket (310),

- An expansion device (400) for expanding and / or contracting the mold core (300), and

- A sealing element (500) which seals the longitudinal opening of the core jacket (310) and which deforms flexibly and / or elastically when the mold core contracts, characterized in that on the side of the sealing element (500) facing the interior of the mold core (300) one or more Guide elements (600A-600E) are arranged and the expansion device (400) is set up to bring the mold core (300) from the expanded state to the contracted state in at least two consecutive shrinking processes, such that at least one driver section (490) of the expansion device (400) in the transition from a first to a second shrinking process of the at least two consecutive shrinking processes for guiding the sealing element (500) in the second shrinking process with at least one driving section (603a) of the one or more guide elements (600A-600E) of the sealing element (500) comes into contact.

2. Molding core according to claim 1, characterized in that one or more guide elements (600A-600E) of the sealing element (500) each have a spacer sleeve (603) each with one of the at least one driving section (603a), the respective driving section (603a) is at a distance from the side of the sealing element (500) facing the interior of the mold core (300).

3. Molding core according to claim 1 or 2, characterized in that the driver section (490) of the expansion device (400) is moved inwardly relative to the mold core when the mold core (300) is contracted, and the one or more guide elements (600A-600E) of the sealing element (500) in the second shrinking process on which at least one driving section (603a) guides and / or takes it along.

4. Molding core according to one of the preceding claims, characterized in that the expansion device (400) comprises a molding element (490) which is expanded in the

State of the mold core in a shape-supporting manner on the side of the sealing element (500) facing the interior of the mold core and is moved inward relative to the mold core when the mold core (300) contracts.

5. The mold core according to claim 4, characterized in that the mold element (490) has the at least one driver portion of the expansion device.

6. The mold core according to claim 5, characterized in that the mold element (490) is a shaped sheet metal extending in the longitudinal direction of the mold core and the at least one driver section of the expansion device is formed by a bore in the shaped sheet metal through which a respective spacer sleeve (603) extends extends one or more guide elements.

7. The mold core according to claim 5 or 6, characterized in that the driving section (603a) of the respective spacer sleeve (603) of the guide element is arranged on the side of the shaped sheet metal (490) facing away from the sealing element (500).

8. Molding core according to one of claims 5 to 7, characterized in that the driving portion (603a) of the respective spacer sleeve (603) of the guide element from the inside of the mold core (300) facing side of the sealing element (500) has a distance that is greater is than the sheet thickness of the shaped sheet.

9. Molding core according to one of claims 2 to 8, characterized in that one or more guide elements each have a stamp section (601) on the side facing the sealing element (500) which engages in a groove section (530a) of the sealing element (500), wherein the groove section (530a) of the sealing element has a substantially T-shape, in particular in cross-sectional profile.

10. Molding core according to claim 9, characterized in that the punch section (601) engages and / or is fitted into the groove section (530a) of the sealing element in a direction transverse to the longitudinal direction of the mold core in a form-fitting manner, in particular in the radial direction of the mold core and / or essentially perpendicular to the radial direction of the mold core.

11. Molding core according to claim 9 or 10, characterized in that the punch section (601) of the respective guide element engages and / or is fitted into the groove section (530a) of the sealing element so as to be displaceable in the longitudinal direction of the mold core.

12. Molding core according to one of claims 9 to 11, characterized in that the sealing element has a connecting web (520) on which a guide strip (530) which has the groove section (530a) and which extends in the longitudinal direction of the molding core is arranged.

13. Sealing element for use on a mold core according to one of the preceding claims, characterized in that the sealing element (500) can be fastened to the respective longitudinal edges of the longitudinal opening of the core jacket (310) by means of a releasable connection and to which, in the fastened state, the interior of the mold core ( 300) facing the side of the sealing element (500) one or more guide elements (600A-600E) are arranged such that at least one driver section (490) of the expansion device (400) in the transition from a first to a second shrinking process of the at least two consecutive shrinking processes for guiding the sealing element (500) in the second shrinking process with at least one driving section (603a) which can be brought into contact with one or more guide elements (600A-600E) of the sealing element (500).

14. Sealing element according to claim 13, characterized in that the sealing element has a connecting web (520) on which a guide strip (530) having a groove section (530a) and extending in the longitudinal direction of the mold core is arranged.

15. Molding device for the production of hollow or in particular tubular concrete bodies, comprising: - an outer shape (200) and

- An inner mold which is arranged in the outer mold and which comprises a mold core (300) according to one of claims 1 to 12.