WO2007101869A2

WO2007101869A2 - Device for producing concrete moulded bodies

Info

Publication number: WO2007101869A2
Application number: PCT/EP2007/052147
Authority: WO
Inventors: Rudolf Braungardt; Holger Stichel
Original assignee: Kobra Formen Gmbh
Priority date: 2006-03-08
Filing date: 2007-03-07
Publication date: 2007-09-13
Also published as: WO2007101869A3; WO2007101869A8

Abstract

The invention relates to a device for the production of concrete preforms in a mould comprising at least one mould cavity and at least one mould core which is held in the form cavity by means of a core holder and is embodied as a hollow sheet metal body. The invention especially relates to advantageous embodiments of mould cores and fixing methods of the core holder.

Description

Device for the production of concrete moldings

The invention relates to a device for producing concrete moldings.

The industrial production of concrete moldings is typically carried out in molding machines with vibrators and molds, in the mold cavity filled with moist earth concrete amount and compacted and solidified in a short time by the action of primarily vertically acting shaking forces. In particular, for the production of partially hollow concrete moldings, such. B. Hohlblock- stones or planters are arranged in the mold cavities forming cores, which are spaced from the walls of the mold cavities and held by the mold cavities spanning strip-shaped elongated core holder in a defined position.

The mandrels are typically designed as composed of welded sheets hollow body. The core holder is passed through recesses in opposite side walls of the hollow body and attached to opposite walls of the mold cavity. The upper edge of the core holder is usually flush with a lid closing the hollow body upwards, so that a flat, continuous upper surface of the mold is provided, via which a filling carriage for machine filling of the mold cavity with concrete amount can be moved horizontally. The core holder is typically welded along its upper edge to two parallel edges of the split lid extending laterally of the core holder.

The core holders are preferably releasably connected to the walls of the mold cavity with the mold. In case of core holders extending over several neighboring mold cavities, the core holders can also be connected to partitions. see the mold nests attached. Such forms are described for example in DE 197 01 590 C2 or WO 03/026860 A1.

DE 10 2004 005 045 A1 describes a core element in which a two-part cover plate terminating the cavity at the top is lowered against the upper edge of the hollow element forming the core element by approximately half the height of the core holder and with the core holder along the edge facing the core welded to both sub-panels, in order to place the welds in a neutral zone of the core holder and to avoid a warping during welding.

In DE 103 26 126 A1 special forms of core elements are described in which z. B. a core element has an integrally connected to the core holder and from this downwardly projecting metallic suspension element has up, which forms as a support for a the outer edges of the core element-defining plastic casting. In one embodiment, the hanging element can be embodied as a hollow inner core which continues directly downwards from the core holder and which can be produced in one piece with the core holder by multiple bending from a complex flat sheet metal blank.

The height of the core holder is limited by the flush with the lid or the upper edge of the mold core course of its upper edge and the flush with the upper level of the compacted concrete molding as flush as possible course of its lower edge. The predominantly vertical shaking forces that occur during the shaking process also have a strong effect on the mold core, which is supported against these shaking forces on the core holder. The high shaking forces often lead to damage in the devices, especially fractures of the core holder. The present invention is therefore an object of the invention to provide a device for producing concrete form bodies with at least one held on a core holder mold core, which shows a reduced tendency to fracture of the core holder.

Solutions according to the invention are described in the independent claims. The dependent claims contain advantageous refinements and developments of the invention.

A particularly advantageous feature of the solution according to the invention with the mobility of the core holder at the passages through the side walls relative to these in a vertical plane containing the longitudinal direction of the core holder is an abrupt and strong change in the stiffness of the core holder in the longitudinal direction of the core holder against vertical bending deformation To avoid the effect of vertical vibration forces on the mandrel and by the support of the mandrel on the core holder. The mobility of the core holder relative to the side walls is given in particular by a vertical mobility and / or rotatability about an axis parallel to the longitudinal axis, in particular combined in the form of a vertical elastic bending deformation of the core holder in the course within the hollow body of the mandrel. The extent of mobility in the bushings may depend in particular on the length of the hollow body in the longitudinal direction and the height of the core holder and is for vertical mobility preferably at least 0.05 mm, in particular at least 0.1 mm, preferably at least 0.25 mm and for the rotatability at least 0.05 °, in particular at least 0.1 °, preferably at least 0.2 °. Here and below, unless expressly stated otherwise, a device with a core holder is understood to mean that at least one strip-shaped core holder is present, and that devices which have a plurality of parallel core holder strips in the usual way for large-volume shaped cores must be included should. As far as the following is of the strip shape of the core holder within the hollow body is mentioned, so far as not meant otherwise in individual cases, a continuation of the cross section of the core holder outside the hollow body understood in the mold cavity through the walls of the hollow body in the longitudinal direction.

Advantageously, holding devices, which are connected both to the hollow body and to the core holder, are arranged in the interior of the hollow body. The holding devices transmit vibratory forces acting on the mandrel to the core holder during a shaking operation. The holding devices are arranged, in particular, below a lid arrangement closing off the hollow body at the top.

In a preferred embodiment, the holding devices are connected to the side walls of the hollow body, in particular welded, wherein the positions of such compounds are advantageously lower than the core holder. Preferably, the entire holding devices are lower than the core holder.

In another advantageous embodiment, the holding devices can also be guided upwards and, in particular, also be connected to the lid of the hollow body, wherein the holding devices are preferably connected to the latter beneath the strip form of the core holder.

The holding devices are advantageously connected to the core holder in a longitudinal direction spaced from the side walls of the hollow body, whereby at such a distance advantageously greater than 25% of the length of the hollow body in the longitudinal direction of the core holder and / or greater than half the height of the core holder. The height of the core holder is considered to be the height of the core holder between walls of the mold cavity and side walls of the hollow body.

In an advantageous embodiment, the holding devices may comprise at least one extension leading from the core holder downwards against its strip shape, which extension is preferably arranged centrally between the side walls of the hollow body in the longitudinal direction. The extension is advantageously integrally material homogeneous connected to the core holder. In particular, core holder and extension can form parts of a one-piece planar sheet metal blank. The minimum width of the extension in the longitudinal direction is advantageously less than the height of the core holder. The transitions between core holder and extension are advantageously rounded.

The flexural rigidity or the bending moment of inertia of the core holder against elastic vertical deflection under the influence of the vertical vibration forces characterizing this advantageously extends in the longitudinal direction without abrupt and / or larger steps. In particular, in contrast to the prior art, when the core holder enters the hollow body of the mold core, there is no sudden increase in the bending moment of inertia against vertical deflections. Advantageously, occurs in an edge region at a distance from the entry of the core holder in the mold core towards the center, said distance is preferably at least 25% of the diameter of the hollow body in the longitudinal direction, no increase in the bending moment of inertia of the core holder or at least no sudden increase over the Bending moment of inertia of the core holder between mold cavity wall and mold core. The extension is in an advantageous embodiment in a vertical web or forms such. The holding devices advantageously comprise a strut arrangement with at least one substantially horizontal strut, which forms the connection of the holding devices with side walls of the hollow body at horizontally opposite ends. The strut arrangement advantageously engages in openings of the side walls of the hollow body and can be welded thereto from the outside.

The strut assembly is connected to the extension or the vertical web, so that shaking forces are transmitted from the hollow body via the strut assembly, the web and the extension to the core holder. In an advantageous embodiment, the strut arrangement on a single strut, which is preferably formed together with the web and the extension by a one-piece flat sheet metal blank. The height of the strut is advantageously greater than the height of the core holder.

The holding devices advantageously have no weld seams, via which shaking forces are transmitted from the hollow body to the core holder. The holding devices can in an advantageous embodiment in the course of power transmission from the hollow body to the core holder elastically deformable damping elements, in particular made of rubber or elastomer. The damping elements can advantageously form parts of screw connections with horizontal screw axes and, in particular, surround the screw axes annularly. The damping elements may be arranged on longitudinally spaced joints with horizontal hinge axes, which are parts of the holding means and / or connect the holding means to the core holder. The elastically deformable damping elements can advantageously be resiliently biased in a rest state. The hollow body is typically composed of a plurality of flat and / or folded sheets, which are welded together. In an advantageous development it can be provided that the between the wall of the mold cavity and the hollow body with the upper cover surface of the hollow body is substantially flush upper edge of the core holder is offset within the hollow body down and extends below a hollow body upwards final cover plate.

In an advantageous embodiment, the hollow body of a mandrel is composed of a lower portion and an upper portion, which are prefabricated separately and joined together to form the mandrel, in particular welded, wherein the side walls of the hollow body in the lower portion have a downward taper and in the upper portion extending substantially cylindrically vertical. The hollow body is preferably supported on its lower portion and the holding means on the core holder. The lower portion is advantageously set by two half-shells formed as folded sheets together. Holding devices are advantageously attached to the lower portion, in particular welded.

Advantageously, the height of the upper portion is substantially equal to the height of the core holder and the passages through the side walls of the hollow body are formed only in the upper portion. The upper portion may advantageously be composed of several parts, which are preferably welded together. The upper section can in particular contain a cover plate and a side wall part, wherein the side wall part in turn can advantageously consist of two half shells which enclose the core holder between them. The construction of a mold core as composed of an upper and a lower portion of the type described above hollow body is also independent of the mobility of the core holder at the passages through the side walls advantageously realized.

Advantageous for the attachment of the core holder to the walls of the mold cavity is a formation of at least one recess for the core holder as a breakthrough through a wall through to a free space on the mold cavity remote from the outer surface of the wall of the mold cavity and an extension of the end of the core holder into the Free space, wherein in the projecting into the free space end of the core holder, an opening is formed, through which transversely to the longitudinal direction of the core holder, a wedge is plugged, which braces the core holder against the outer surface of the mold wall. The tensioning takes place in particular in the longitudinal direction.

In an advantageous embodiment, the wedge may be resiliently deformable towards the outer surface of the wall, for which purpose the wedge in particular can have a recess, in particular in the form of a concave curvature, towards the outer surface of the wall so that the contact surfaces of the undeformed wedge contact the outer surface of the wall from the recess in the wall and from the core holder are spaced. The mutual contact surfaces of the wedge and / or opening of the core holder are advantageously designed arched away from the outer surface of the wall, which favors a small twisting movement of the core holder during the shaking operation.

The invention is illustrated below with reference to preferred embodiments with reference to the figures still in detail. Showing: Fig. 1 shows a mold with cores in mold cavities

2 shows an oblique view of a mold core with core holder,

3 shows a section through FIG. 2 in an x-z plane, FIG.

4 shows a section along IV - IV of Fig. 3,

5 shows a section along V - V through Fig. 3,

FIG. 6 shows an opened arrangement according to FIG. 2, FIG.

7 is an enlarged detail of FIG. 6,

FIG. 8 shows an alternative embodiment in a view corresponding to FIG. 2, FIG.

9, the arrangement of FIG. 8 opened,

10 is an enlarged detail of FIG. 9,

11 shows a core holder arrangement for a plurality of mandrels,

12 is a mold core with core holder for planter,

13 the mold core according to FIG. 12 without cover, FIG.

14 is a sectional view of FIG. 12 from above, 15 is a sectional side view of FIG. 12,

16 shows a further mold core with core holder,

17 is a partially transparent view of FIG. 16,

18 is a sectional view of FIG. 16 from above,

19 is an enlarged detail of FIG. 18,

20 shows an articulated mounting of a core holder,

21 shows a bearing design in detail,

22 shows a further mold core with core holder,

FIG. 23 is an opened view of FIG. 22; FIG.

FIG. 24 is a sectional view of FIG. 22 looking in the longitudinal direction; FIG.

FIG. 25 shows an alternative embodiment to FIG. 24, FIG.

26 shows parts of an advantageous embodiment of a composite mold core,

27 is an assembled from the parts of FIG. 27 open hollow body,

28 is a version with split lid, FIG. 29 shows a variant of a part from FIG. 26, FIG.

FIG. 30 shows a further variant of a part from FIG. 26, FIG.

31 is an assembly of parts of another embodiment,

FIG. 32 the parts of FIG. 31 assembled, FIG.

FIG. 33 shows a modification of FIG. 32 for narrow cores, FIG.

FIG. 34 shows a modification of FIG. 32 for wide cores, FIG.

FIG. 35 shows an arrangement as in FIG. 32, FIG.

FIG. 36 shows a hollow body, FIG.

37 shows the parts from FIG. 35 and FIG. 36 in the connected position, FIG.

38 another embodiment opened,

39, the arrangement of Fig. 38 is closed,

FIG. 40 shows a section through FIG. 39 transverse to the longitudinal direction, FIG.

41 shows a section through Fig. 39 in the longitudinal direction,

FIG. 42 shows an advantageous cover plate from below, FIG. FIG. 43 shows a two-part modification of FIG. 42, FIG.

FIG. 44 shows an oblique view of a mold having a plurality of mold cavities and mold cores without a cover sheet, FIG.

45 is a detail of FIG. 44,

46 shows parts of an arrangement with wedge clamping of the core holder,

47 shows the parts according to FIG. 31 in the assembled position, FIG.

48 is a side view of a wedge bracing,

49 is a plan view of the wedge clamping of FIG. 46,

FIG. 50 is a view of the wedge bracing of FIG. 46 in FIG

Longitudinally

51 shows a special wedge shape,

52 is a plan view of a wedge bracing with a wedge of Fig. 47,

53 shows an assembly drawing of a further mold core arrangement,

54 is a mold core half, 55 shows a connecting element,

56 shows a variant of FIG. 53 for narrow cores,

Fig. 1 shows an oblique view of a mold FO for the production of partially hollow concrete moldings. Plotted with a right-angled xyz coordinate system. The mold is commonly used in a molding machine. The shape lies with a lower horizontal (x-y) boundary plane on a not shown vibratory pad, z. As a stone board and / or vibrating table. The mold has a plurality of mold cavities FN which are upwardly and downwardly open and have substantially vertical cavity walls NW. Shaped cores FK are arranged at a distance from all walls NW in the mold cavities, said mold cores being held in a defined position over longitudinally extending strip-shaped core holders HK.

Fig. 2 shows a first embodiment of a mold core FK with a core holder HK in an oblique view, in which case only one mold core in a mold cavity is assumed. In Fig. 3 is a sectional view of the molded body is sketched in a mold cavity with an extending through the core holder x-y-sectional plane. FIGS. 4 and 5 show views in the x direction along sectional planes IV-IV and V-V of FIG. 3. In FIG. 4, pressure plates DPA, DPB, which dip into the upper opening of the mold cavity, are additionally located in positions in front of and in front of them. drawn after the shaking process.

The mold core FK according to FIG. 2 to FIG. 5 consists in a conventional manner of a hollow sheet metal body which has a plurality of side walls KWx, KWy and a lid KD. The hollow body is open in the selected example down and lies with its lower edge on a board SB, which in turn rests on a vibrating table RT, as a vibratory pad on. The lower edge of the hollow body is in the rest position in a lower boundary plane FUE of the form. The hollow body is typically welded together from a plurality of flat or folded sheets. In the example outlined, the hollow body consists of two half shells FKA and FKB, which abut one another along a butt seam KT and are welded together.

In the x-direction, d. H. in the longitudinal direction of the core holder HK opposite side walls KWx of the hollow body bushings KWD are cut for the core holder HK. The lid KD runs in two parts on both sides of the core holder HK. The upper edge HKO of the core holder runs flush with the upper surface of the lid KD and with the upper boundary plane FOE of the shape, which may also be formed by a cover plate. Due to the flush course of the upper boundary plane FOE, upper edge HKO of the core holder and lid KD a filling carriage assembly horizontally along guide rails FFL of Fig. 1 are moved over the mold to the space between the mandrel and the walls NW of the mold cavity with humid concrete amount fill and just strip. In that regard, mandrels core holders are known per se.

After filling the mold cavity, a ballast assembly with a punch assembly is placed in the top opening of the mold cavity on the concrete batch. The punch assembly has two pressure plates DPA and DPB, which dive into the mold cavity on both sides of the core holder and are separated by the core holder. In a subsequent Rüttelvorgang with predominantly vertically directed shaking movements of the vibrating table on the Rüttelunterlage on the mold with mold core and concrete amount, the concrete quantity is compacted into still moist, but already dimensionally stable concrete form bodies. During compaction, the pressure plates sink from the initial upper one Position of the pressure plate DPB in a lower position of the pressure plate DPA, in which the undersides of the printing plates are substantially at the lower edge HKU of the core holder at the same height. The moldings can then be removed from the mold cavity by relative vertical movement of the board SB and the load against the mold FO with the mold core FK down.

Formed core FK and core holder HK are in known arrangements typically along along both sides of the core holder in the longitudinal direction x extending edges TH of the lid KD welded together to intercept the forces acting during demolding and especially during the shaking on the hollow body of the mandrel vertical forces and the hollow body to the core holder support. The core holder typically runs like a strip with a constant cross section between opposing walls NW over the entire mold cavity and through the hollow body.

In contrast, the core holder in the embodiment according to the invention in the implementation KWD through the side walls KWx of the hollow body is parallel to a vertical xz plane relative to the side walls KWx and the lid KD movable, in particular in the form of a vertical relative movement and a rotational movement about a horizontal Rotational axis transverse to the longitudinal direction x of the core holder HK in the y-direction, as indicated in Fig. 3 by the curved arrows BH, the degree of movement of the core holder is in extreme cases far less than the length of the arrows in Fig. 3, which only to indicate the nature of the movement. The core holder is in particular in its longitudinal course by the hollow body in contrast to known solutions under the action of vertical vibration forces vertically elastically bendable by a small amount. As a result, in particular, a vertical deflection of the core holder between mold core FK and walls NW of the mold cavity can be continuous in its section within the hollow body continue. Gaps between the lower edge of the core holder and the bushings KWD through the side walls of the hollow body may be filled by deformable material.

The strip-shaped core holder is this advantageously not directly, but connected via holding devices in the interior of the hollow body with the hollow body. The holding devices transmit the vertical forces to support the hollow body on the core holder. The core holder is in particular not welded to the lid KD of the mold core and guided only between the two ceiling halves without vertical power transmission. The connection of the holding devices with the strip-shaped core holder is advantageously carried out in the longitudinal direction x of the side walls KWx of the hollow body spaced positions. The distance AA is advantageously at least 20% of the diameter of the cavity between the two bushings KWD.

In the side view of FIG. 3, a particularly advantageous basic form of the holding devices and their connection to the hollow body and the core holder is clearly sketched. The holding devices are assumed as well as the hollow body as symmetrical with respect to a y-z-median plane MEx.

The holding devices contain a protruding from the strip shape of the core holder HK down projection which forms a vertically oriented web ST. The web is connected at its lower end with a substantially horizontal strut QS, which spans the interior of the hollow body between opposite side walls and attached thereto, in particular welded. For attaching the strut QS on the side walls advantageously engage extensions of the strut QS in Ausspa- KWA of the side walls and are welded there. The height HQ of the strut QS is preferably greater than the height HL of the core holder HK.

In a preferred embodiment sketched strip-shaped core holder HK, the extension ST forming the web and the strut QS are integrally formed as a uniform planar blank z. B. a sheet executed.

The strip-shaped core holder has advantageously in the longitudinal direction x within the hollow body no abrupt or greater changes in its bending stiffness against elastic vertical deflection. It proves to be particularly advantageous for this to choose the width BS of the web ST in the longitudinal direction x smaller than the height HL of the strip shape of the core holder. The web is advantageously about curves RU in the lower edge of the core holder over. The height HQ of the strut QS is preferably greater than the height HL of the core holder, so that a deflection of the strut QS under the influence of the vibration forces can be neglected.

Particularly high loads on the core holder result from the core holder abruptly accelerating upwards shaking forces. The core holder of the sketched in Figure 3 side view undergoes an elastic bending deformation upward, which is largely uniform and without destructive voltage peaks in the core holder over the entire length of the core holder between opposite walls through the central power transmission through the web ST width BS of the mold cavity. In this case, in the bushings KWD through the side walls KWx of the hollow body, a combination of vertical and rotating movement of the core holder relative to the side walls of the hollow body, as qualitatively indicated by the curved arrows BH in Fig. 3. Fig. 6 shows a mold core sketched in Fig. 2 type in an open view by omitting the half-shell FKB of the hollow body. Details of an advantageous attachment of the strut QS to the side walls KWx of the hollow body are outlined in the enlarged section VII according to FIG. The strut QS is centered horizontally by steps QSA abutting the inner surface of the side walls KWx. An alignment in the surface of the side walls KWx takes place by means of projections QFF, which engage in recesses KWA of the side walls. By chamfering the edges of the projections QFF as sketched and / or by chamfering the edges of the recesses KWA creates an advantageous for welding fillet weld with advantageously low volume. The fillet weld may also be present only along part of the edge of the recesses KWA. The projections QFF advantageously extend to the outer surface of the side walls.

In the embodiment of a hollow body with core holder HK and holding devices of the described type and the enlarged cutout X from FIG. 9 in FIG. 10 sketched in FIG. 8 in the closed state and in FIG. 9 in the opened state, protrusions QFL engaging in the recesses KWA are not Beveled and executed perpendicular to the wall surfaces of the side walls, the Ausfü- ments only partially filling. A welding of the transverse strut QS with the side walls of the hollow body can advantageously be carried out in the manner of the hole welding in this embodiment.

The embodiment of the hollow body FKZ in FIG. 8 and FIG. 9 also shows an advantageous design of the side walls along the connecting seam TS of the two half shells FZA, FZB of the hollow body with undercut recesses FAZ and extensions FFZ corresponding to them and engaging in these in a form-fitting manner. whereby the two half shells after joining under the intervention of the projections FFZ in the recesses FAZ are aligned in a defined position to each other and the process of welding the two half-shells is simplified.

For a given sufficient elastic deformability of the side walls of the composite hollow body advantageously the core holder with the holding devices after connecting the two half shells FZA, FZB can be used from above by the core holder with web and cross member QS is pressed down, the projections QFL opposite Press apart side walls KWx of the hollow body elastically apart until the projections QFL engage in the recesses KWA, wherein the small engagement depth of the projections QFL in the recesses requires only a slight elastic expansion of the hollow body.

11 shows an exemplary embodiment of a long core holder HKL, with which a plurality of similar holding devices of the type outlined in the preceding figures are connected. Several mandrels FK1, FK2, FK3 are indicated by broken lines. The plurality of mandrels FK1, FK2, FK3 may each be assigned to separate mold cavities or may form a plurality of longitudinally spaced cavities in one and the same concrete mold body. In each case separate mold cavities for the individual mold cores are in the longitudinal direction x between the individual mold cores in the fully assembled device nor partitions of the mold, which separate adjacent mold cavities from each other.

Fig. 12 shows an oblique view of a composite mold core FKP for common Pflanzkübelformen. In Fig. 13, the lid of such a mold core is removed to release an insight on the holding devices in the interior of the hollow body. FIGS. 14 and 15 show horizontal and vertical sectional images of the mold core, respectively. The side walls KPW of the hollow body are repeatedly curved and subsequently not distinguished as individual side surfaces. The walls of the associated mold cavity are typically guided at a substantially constant distance from the side walls KPW of the mold core running.

The hollow body of the mold core FKP is again open at the bottom and from its lower edge UFP, which coincide with the lower boundary plane FUE of the form, vertically spaced an annular stiffening plate LP, but through which there is access from below into the interior of the hollow body.

Due to its size, the hollow body of the mold core FKP is typically held on two parallel core holders HKA and HKB, which are spaced apart transversely to their longitudinal direction, and which are guided through respective passageways through the side walls of the hollow body. The hollow body upwardly flush with the upper edges of the core holder HKA, HKB closing lid KPD is in this case divided into three and typically welded circumferentially with the side walls along the upper edge. The holding devices in the interior of the hollow body have in the manner already described on both core holders HKA, HKB downgoing vertical webs ST. The holding devices further include horizontal struts QPA, QPB, which are connected to the side walls of the hollow body, in particular welded. The holding devices are not formed in one piece in this case. At the lower ends of the webs ST belt plates GA and GB are formed, which are bolted to the attached to the side walls of the hollow body struts QPA and QPB. The belt plates GA and GB respectively form one-piece planar blanks with the webs ST and the core holders. The screw connection of transverse webs QPA or QPB with belt plates GA or GB ensures a stable mounting of the hollow body to the core holders and an additional Reliable transmission of vertical forces and support of the hollow body against such vertical forces on the core holders. For the screw advantageously fitting screws PS are used. The course of the sectional planes of the sketches according to FIGS. 14 and 15 is indicated by XIV in FIGS. 15 and XV in FIG. 14.

FIGS. 16 to 19 show a further example of a mold core FKQ held on two core holders KQA and KQB, which is again assumed to be open at the bottom and is composed of two half-shells. In a further modification of the holding devices in comparison to the preceding examples according to FIGS. 12 to 15, cross struts are provided between longitudinal sides of a half shell by a double strut arrangement DQ which encloses the belt plate GB situated at the lower end of a vertical web ST between them , The belt plate GB is connected to the double strut assembly DQ again by transverse to the longitudinal direction screws PS. The holding devices are clearly visible in FIG. 17 with a half-shell drawn in transparent and the sectional top view according to FIG. The height of such a double-strut arrangement may also be less than the height HL of the core holder. Advantageously, however, the vertical bending stiffness of the double-strut arrangement is significantly higher than that of the core holder.

Fig. 19 shows a detail DK of the screw connection, in which an intermediate layer of elastic material is used. In bores BG of the belt plate GB damping sleeves are inserted with a metallic outer ring HA and a lying inside this ring DR of elastic damping material, preferably pressed. The ring DR of elastic damping material in turn abuts the outer surface of a spacer sleeve DH, through which the shaft of a screw or a bolt PS passed through. The distance between the two partial struts of the double strut assembly DQ is a small amount greater than the thickness of the belt plate GB, so that the belt plate between the partial struts of the double strut assembly DQ is movably held within the deformability of the elastic Dämpfungsma- terials of the ring DR. The storage over interposed elastically deformable damping material particularly effectively absorbs force peaks during the shaking process. The damping material is advantageously biased radially elastic.

In Fig. 20, an embodiment is indicated, in which a strip-shaped core holder HKG has two spaced within the hollow body of its side walls spaced hinge bores GO1 and GO2. To compensate for the weakening of the core holder cross-section in height, the lower edge of the core holder may be evasive downwards at these positions, thereby increasing the height of the core holder at the attachment positions. The increase in the height of the core holder strip can advantageously be limited in the longitudinal direction x to the areas of the attachment positions. The change in the core holder height is advantageously carried out gradually while avoiding a stepwise, abrupt change. The height of the core holder strip advantageously increases by no more than 100%, preferably not more than 50%, of the height of the core holder strip in the longitudinal regions between the mold core and the mold cavity walls. The holding devices comprise a double-strut arrangement QG, which is connected to the side walls of a hollow body. In partial struts of the double-strut arrangement QG bores are likewise provided in the longitudinal direction x at the same distance as the bores GO1 and GO2 in the core holder HKG, by means of which a hinge pin arrangement GC can be plugged in and screwed onto the opposite side with a nut SH. The hinge pin arrangement consists of a bolt body with a multiple radial graduated ten bolt shank, wherein two spaced longitudinal portions of the bolt shank are fitted snugly into holes in the two part struts of the strut assembly and an intermediate shaft portion rests over a ring DR of elastically deformable damping material in a bore GO1 or GO2 of the core holder. The core holder is held centered by discs RS between the two partial struts of the double strut assembly QG. Under the influence of vibration forces the core holder is vertically bendable and pivotally articulated through the bearings in its holes GO1 and GO2 in the context of deflection. Instead of the stepped and screwed bolt with the ring DR and the disks RS, a simple bolt and its encapsulation with elastic plastic material can also be provided.

Fig. 22 shows an oblique view of a further advantageous embodiment of a mold core. This is provided for forming a closed-bottom cavity in a concrete molding and therefore not guided down to the Rüttelauflage in the mold cavity down. The hollow body of the mold core is closed in this case on its underside by sheet metal surfaces. Such closed form cores are known per se. The hollow body of the mold core FKG according to FIG. 22 shows a special feature in that the hollow body is closed at the top by a lid plate DD, which is continuous in the y-direction transverse to the longitudinal direction of the core holder. For this purpose, as can be seen from the open by omitting a half-shell of the hollow body view of FIG. 23, the upper edge HGO of the core holder HG inside the hollow body with respect to the course outside the hollow body have a downwardly lowered course HOS. In order to achieve a substantially constant rigidity and strength of the core holder can be provided that substantially the same running and the lower edge HGU of the core holder is lowered in the interior of the hollow body down. The cover DD is then not divided into two sub-plates lying on both sides of the core holder, but lies as a through going uniform plate in the area of the lowered course HOS of the core holder over this. Preferably, a narrow air gap SL (FIG. 24) is provided between the lowered course HOS of the upper edge of the core holder and the underside of the cover plate DD. The cover plate formed continuously in the y-direction in conjunction with the lowering of the upper edge of the core holder below the cover plate is also of particular advantage independently of the vertical subdivision of the side walls of the hollow body and the special design of the holding devices.

A further variation of the previous arrangements is given in the example of FIG. 23 in that the transverse strut QT at the lower end of the web ST does not pass at a constant height up to the side walls of the mold core FKG, but is already essentially spaced from the sidewalls in extensions FT lesser height passes and is fastened with these extensions FT in recesses of the side walls. A reduction in the height of the extensions FT is particularly advantageous for a type of assembly already described, in which the two half-shells of the hollow body are connected and only then the core holder, web and strut common one-piece blank is inserted from above, with a small lateral Aus Pressing the side walls of the hollow body is required. For exact guidance of the core holder during insertion lateral guide struts FH can be prepared in the two half-shells. Fig. 24 shows a central section through the arrangement with a view in the longitudinal direction x of the core holder, whereby also the narrow air gap SL between the lowered course HOS of the upper edge of the core holder and the cover plate DD can be seen.

FIG. 25 shows a modification of the arrangement according to FIG. 24 in that here a guide of the core holder in the cover plate, which is made thicker than in FIG. 24, is provided by the fact that in the inside of the cover kelplatte a guide groove NF is milled, in which the upper edge of the core holder, which in turn is lowered against the course of the upper edge of the core holder outside of the hollow body, rests. Again, a narrow air gap SL between the lowered upper edge of the core holder and the bottom of the groove NF is provided again.

Fig. 26 shows parts of another advantageous embodiment of a hollow sheet metal body for a mold core, which is composed of vertically successive sections. The sections are preferably welded together. Two half-shells HLA and HLB forming a lower portion of the hollow body are each produced in one piece by folding a flat sheet metal blank and have a slight tapering of their side surfaces, which is favorable for demoulding, towards the bottom. The lower portion of the hollow body is supplemented at the top by an upper section adjoining the upper edge of the lower section, the side surfaces of which extend substantially vertically and thus have a cylindrical outer contour. The cylindrical outer contour is advantageous for the displacement of the printing plates, by which they migrate during the shaking down. The upper portion is formed in a preferred embodiment of two U-shaped parts, in particular sheet metal parts.

FIG. 27 shows the hollow body composed of the parts according to FIG. 26, which is still open at the top. Bushings for a strip-shaped core holder are advantageously formed by gaps between the mutually opposite U-shaped sheet metal parts of the upper section. The lower portion forms a closed shell as in the hollow bodies of the preceding Figs. 22 to 25. The hollow body can be completed in the usual way above by a one-piece or multi-part lid. In Fig. 28 is a section through a hollow body together with Core holder and holding devices sketched in which a two-part cover plate KD is welded to the upper edges of the U-shaped sheet metal parts HHA, HHB of the upper portion and includes the core holder without vertical force coupling between them.

Fig. 29 and Fig. 30 show modifications of the U-shaped parts HHA, HHB of the upper portion of a hollow body according to Fig.26 and Fig. 27. Here, in the U-shaped part HUH of Fig. 29, a mold is provided which through Laser cutting is obtained from a thicker plate. At the inwardly facing surfaces of the U-shaped part HUH at least two inwardly projecting portions HV are formed, which form supports for a cover plate, which has holes over these supports and can advantageously be welded by plug welding. The form of a U-shaped part HUL sketched in FIG. 30 provides a U-basic shape, preferably made as an abutment plate, on the inner walls of which at least two supports HT lowered against the upper edge are arranged, in particular welded, on which a cover plate can be placed and preferably laid can be welded to the supports again via hole welding.

In Fig. 31 parts of a particularly advantageous embodiment are outlined, the peculiarity is that the holding devices are not fixed as in the previous examples on the side walls of the hollow body but on the lid, which is preferably designed as a continuous plate over the core holder for this purpose. In FIG. 32, the parts drawn separately in FIG. 31 are sketched in the connected state.

For the holding devices, the described elements of a web ST at the lower edge of the core holder and subsequently a cross strut QV are again at the portions facing the core holder intended. The transverse strut is connected to connecting elements VER, which lead upwards to the lid DPH and connected thereto, in particular welded. The connecting elements advantageously lead in the y-direction on both sides of the core holder on this past in the z-direction up to the lid and advantageously form an upwardly open fork around the core holder.

The embodiment of the holding devices with separate connecting elements VER for connecting parts of the holding devices with the lid DPH lying below the core holder advantageously makes it possible to produce the core holder HG with web ST and cross strut QV as a flat blank, in particular by water jet cutting, laser beam cutting or the like and also the execution of the fasteners VER as flat blanks.

Connecting elements VER and parts of the holding devices between the connecting elements and the core holder, in the example shown connecting elements VER and cross member QV advantageously have centering, by means of which these parts are aligned in a defined position to each other. In an advantageous sketched embodiment, such centering structures comprise projections VQ at the side edges of the transverse strut QV lying opposite in the x-direction and these shape-adapted recesses AUV in the connecting elements for mutual engagement, as shown in FIG. The transverse strut QV lies with the core holder HG in an x-z plane, the connecting elements advantageously in vertical planes, in particular y-z planes.

The cover advantageously has recesses ADV, in which upper ends VEO of the connecting elements engage and thereby to simple Ways to weld with the lid are precisely positioned. The cover can be connected to the sidewalls of the hollow body in various ways, in particular also in one of the ways shown in the previous examples, preferably by welding or screwing, for which further recesses DAH are provided in the cover according to FIGS. 31 and 32 can be provided.

In the shaking operation, vertical acceleration forces acting on the lower edge or underside of the hollow body of the mandrel are conducted via the sidewalls of the hollow body to the cover DPH, from the latter via the connecting elements to the transverse strut QV and from there via the web ST to the core holder HG

The connection of the holding devices to the lid of the hollow body advantageously makes it possible to prefabricate the assembly shown in FIG. 32 with high precision while at the same time providing good accessibility to all processing points.

33 shows an arrangement corresponding to FIG. 32 but drawn without a cover for forming cores which are particularly narrow in the y-direction and which differs from the embodiment according to FIG. 32 in particular by the connecting elements VES with smaller dimensions in the y-direction.

For shaped cores having a large extension transverse to the longitudinal direction and two core holder strips spaced apart from one another, the two core holder strips, eg in the manner of FIG. 32 or FIG. 33, can be individually connected to a cover of the hollow body. In a preferred embodiment, however, transverse connecting elements VEL are used transversely to the longitudinal direction via both core holder strips, as shown in FIG. 34. The connecting elements VEL are in the y-direction on both sides outside the space between the two core holder strips with upper ends VOA and at least one position between the two core holder strips, z. B. with an upper end VOM connectable with a lid.

An advantageous connection of an assembly with cover, holding devices and core holder, z. As outlined in Fig. 32 type, with side walls of a hollow body is separated with assembly BOV of FIG. 35 and lower part BUV of FIG. 36 and outlined in Fig. 37 after assembly. On the inner side of opposite side walls of the lower part BUV of the hollow body inwardly projecting attachment structures, for. B. bracket HW provided on soft the lid is fixed by welding through the recesses DAH.

Yet another embodiment is outlined in Fig. 38 in an open view of a hollow body, which is shown in Fig. 39 in a completely closed form. The holding devices here comprise an upwardly open U-profile, which is welded to the cover walls of the hollow body via its upper edge with the cover or preferably via its end faces lying opposite in the longitudinal direction. The profile shows on its underside at least one, in the example sketched advantageously two incisions US. According to sectional images in Fig. 40 and Fig. 41, two downwardly extending extensions FU are formed on the core holder HU, which protrude into the recesses US and secure the core holder against horizontal displacement. Advantageously, a gap between the upper edge of the core holder and the bottom of the groove NU in the bottom of the lid DU filled with permanently elastic damping material. Also between the transitions of the projections FU in the core holder and the edges of the recesses US in the bottom of the profile is advantageously permanently elastic damping material DM. In this example, the cover DU is fastened to retaining angles HWS on inner walls of the lower part by screws DWS. In a modification, the core holder does not lie with its lower edge directly on the profile, but rather on an intermediate body made of elastically deformable material, which in particular can have a slightly upwardly curved support surface. The lid is then preferably secured by screwing.

FIG. 42 shows an advantageous embodiment of a cover plate DPH of the type sketched in FIG. 31 with a view of the underside facing the interior of the hollow body. In this, the already described guide groove NF is milled, which advantageously passes over bevels NFA in the longitudinal direction opposite edges of the cover plate. In the underside of the cover plate a circumferential along the circumference of the cover plate level DST is also milled into the edge over which the lid rests on the upper edges of the side walls and is recessed and centered with the inner surface part between the side walls. In the example outlined, the width of the step DST against the outer edge of the lid is not constant in an x-y plane. In several places, the step width is broadened by free cuts FF, in which z. B. elastic material for vibration damping between the lid edge and upper edges of the side walls can be inserted.

In FIG. 43, a divided cover plate of the type provided in FIG. 2 or FIG. 28 having a structured underside in the manner of FIG. 42 is shown, wherein a parting line AK for the core holder is provided instead of the groove NF.

In another embodiment, which is not sketched, the prefabricated upper assembly of the type BOV according to FIG. 31 and FIG. 32 can also be additionally provided with upper side wall parts of the type of parts HHA, HHB according to FIG. 26, HUH according to FIG 30 and include at the lower edges of these upper side wall parts with the upper edges of lower side wall parts of the hollow body.

In Fig. 46, an advantageous attachment for a core holder HKK is sketched on the mold walls as an assembly diagram of the essential parts. Shaped cores held on the core holder are not shown for the sake of clarity. The core holder HKK is connected to two similar holding devices HE1, HE2 of the kind already described in detail for forming cores. The holding devices HE1 and HE2 are adjacent, separate

Assigned form nests, which are separated by an intermediate wall ZW. The mold cavities are closed off towards the edge of the mold by outer walls AW. The intermediate wall ZW has a recess ZAU, in which the strip-shaped core holder HKK is inserted. The outer walls AW have corresponding recesses WAU for insertion of the opposite ends of the core holder HKK. The recesses WAU in the outer walls AW pass completely through the outer walls. The outer walls have an outer surface AF which is remote from the mold cavities and which can be both the outer surface of a plate serving as an outer wall and a surface of a recess introduced deliberately facing away from the mold cavity from the rear side of the outer wall AW. In both cases, on the side of the outer wall AW facing away from the mold cavity, there is an outer surface AF and a free space into which the extended end of the core holder protrudes. An end of the core holder projecting into such a free space has an opening KO. At the ends of the core holder stages DS are formed in the form of a lowering of the upper edge of the core holder. At these stages, a cover plate DB is placed. The cover plate DB can be connected to the outer wall AW, in particular welded or screwed. The opening KO of the end of the core holder HKK protrudes partly into the free space on the side of the outer wall facing away from the mold cavity. A wedge KE is driven transversely to the longitudinal direction x of the core holder in the y-direction through the opening KO and is supported with a first contact surface on a counter contact surface of the opening KO and with a further contact surface on the outer surface AF of the outer wall AW. When the wedge KE is driven into the opening K0, the wedge holder HKK is braced in the longitudinal direction x against the outer surface AF of the outer wall AW. A counterforce by the wedge force can be given by the respective other wedge at the other end of the core holder on the one hand, but can also be given by a support of the stage DS of the wedge holder on the cover plate DB.

FIG. 47 shows the parts shown separately in FIG. 46, again with the walls only as area cutouts and without the associated forming cores.

Fig. 48 shows a side view of the position of the wedge bracing in the viewing direction y, Fig. 49 shows a sectional plan view of the wedge bracing, Fig. 50 shows the same viewed in the longitudinal direction x on the outer wall.

51 shows an advantageous development of a wedge shape KV, in which the side of the wedge facing the outer surface AF of the outer wall AW shows a recess KAU, in particular in the form of a concave curvature away from the outer surface AF. The wedge is thus only on in its longitudinal direction y spaced contact surfaces on the outer surface AF. This wedge shape allows a limited resilient yielding of the wedge in the longitudinal direction x and thus a particularly advantageous behavior against dynamic loads in Rüttelbetrieb. The contact surface FK of the wedge against the counter contact surface of the opening KO in the core holder can advantageously be, as in the zen shown curved, which is favorable for low tilting movements of the core holder in Rüttelbetrieb. 52 shows a plan view of a wedge bracing with a wedge according to FIG. 51.

The wedges may be fixed in their positions sketched in FIG. 45 or FIG. B. by welding to the outer wall AW and / or the end of the core holder.

FIG. 44 shows a device as a partially assembled mold with outer walls AWx or AWy extending in the longitudinal direction x and transverse direction y, and intermediate walls ZWx or ZWy and mold cores FK fastened to core holders HK in the form of nests FN as the precursor of the mold according to FIG , The core holders HK extend in the x-direction over a plurality of mold cavities and are fastened to the outer walls AWy via the wedge stresses described in FIGS. 46 to 52 and additionally at points of intersection PAz with the intermediate wall ZWy in a manner known per se. In each mold cavity, two mold cores FK are arranged on one and the same core holder in the longitudinal direction of each other and spaced apart from the mold cavity walls. In FIG. 1, the device according to FIG. 44 is supplemented by cover plates DB, guide rails FFL for a filling carriage arrangement, abutment plates ABV and retaining flanges HFM for clamping the mold into a molding machine, but a conventional attachment of the core holder strips to the outer walls of the mold without the steps DS is sketched at the ends of the core holder strips and with slots for the core holder strips in the cover plates. The mold is placed in the molding machine with the bottom not visible in FIG. 44 and FIG. 1 on a vibrating table or a comparable vibratable support and pressed. Cover plates DB, upper edges of the core holder HK and cover of the hollow body of the mold cores lie substantially in an upper level. Fig. 45 shows an enlarged section of Fig. 44 with the wedge bracing of the end of the core holder HK against the outer wall AWy and the step DS for inserting the cover plate. FIG. 45 also shows the beveling of the upper edges of the core holder which is possible in all exemplary embodiments and which, like a bevel of the upper edges of the outer walls, partitions and mandrels, can facilitate the introduction of the pressure plates into the upper openings of the mold cavities in a manner known per se ,

In Fig. 53, a further advantageous embodiment of a mold core assembly is sketched in the manner of an assembly drawing. In this example, the individual mandrels consist of two half-shells KH, which are arranged in pairs on both sides of the core holder strip KL and can be connected to an all-sided closed, the core holder strip between them enclosing hollow body. The half shells KH can be designed, for example, as sheet metal body. In an advantageous embodiment, for the pairwise connection of half-shells KH with each other and with the core holder strip connecting elements BV may be provided which extend transversely to the longitudinal direction x of the core holder strip in the horizontal y-direction and extend through the y-direction of the mold cavity facing side surfaces Ky of the half shells KH.

In a particularly advantageous embodiment, the half-shells KH are sketched in an enlarged view, as shown in FIG. 54, provided on the inside with holding elements, for example a holding plate IP extending continuously in the x-direction between opposing walls Kx, which z. B. can be designed as produced by laser cutting flat blank. The holding elements serve to connect the half shells to one another and / or to the core holder arrangement, in particular by using additional holding elements. mente. In such holding elements, a through hole DB and a threaded bore GB are provided in a preferred embodiment. The through hole DB lies in the y-direction coaxial with an opening BK in the side wall Ky of the half-shell and the threaded bore GB is in the y-direction coaxial with a corresponding bore DB and opening BK of the opposite to be arranged second half-shell. Furthermore, from the bottom of the core holder strip KL via a narrow extension ST downwardly projecting a wider support plate BS to each mold core provided in which two holes BB are provided, which with the openings BK and DB or the threaded holes GB of the opposite half shells in lie axially aligned in the y-direction.

As a fasteners are advantageously sketched in Fig. 55 threaded bolts BV, fitting screws or the like. With a matching in the threaded holes GB thread GV, a suitable in the holes DB and BB shank diameter D1, a collar BU at the transition to a bolt diameter D2, which is matched to the diameter of the openings BK and a tool neck WA. The bolts BV are inserted from the outer surfaces Ky through the openings BK in the wall of the half shells KH, through the holes DB of the inner support structure of the same half-shell, through the bore BB of the widened plate BS at the lower end of the extension ST of the core holder assembly and in the Tapped hole GB of the support structure of the opposite half shell screwed. In this case, the collar BU of the bolt BV lies against the outer edge of the bore DB of the one plate and clamps it against the core holder arrangement and the opposite half shell. A after tightening of the connecting bolt on the side surface of the half shell Ky addition part of the connecting bolt BV with a tool neck WA is then separated flush with the outer surface of the side wall Ky, possibly with the outer wall of the Half shell welded and sanded. The core holder strip KL preferably remains again without direct connection to the two half-shells and is connected to these only indirectly via the extension ST and the widened plate BS. For the type of screwing opposite half shells a variety of other possibilities from the connection technology are well known. In particular, the connecting bolt BV can also be doubly stepped in its longitudinal direction y and / or also have a centering conical structure instead of a right-angled collar.

In other unspecified embodiment, the half-shells may be attached to the core holder assembly without the holding elements by z. B. connecting elements between opposite outer walls Ky running continuously and are connected to both side walls Ky and the core holder assembly. The connection with the side surfaces Ky preferably includes a weld.

In Fig. 56, a further advantageous embodiment of a mandrel assembly is constructed with constructed of two half-shells mold cores on a core holder strip KLS. From the core holder strip in turn protrude extensions ST down, at the lower end widened plates BSS are arranged. The half shells KHS are designed in this example with a very small depth in the y direction.

In the widened plates BSS at the lower ends of the extensions ST centering structures, for example, pressed centering bolts ZB in y-

Direction over the plate surfaces provided above. In the side walls of the half-shells KHS, corresponding centering counter-structures, in particular bores ZO, are provided for these centering bolts. The centering structures and counter-structures serve to positionally align the Half shells KHS with respect to the core holder assembly, in which the opposite half-shells with engaging in the counter-structures ZO centering ZB attached to the core holder assembly and held there until final attachment. The final fastening is preferably carried out by plug welding the half shells KHS through the openings SO with the widened plates BSS of the core holder arrangement. The openings ZO can also be welded shut to level the outer surface.

The upper edge of the core holder strip KLS has in the sketched embodiment in longitudinal sections in the x-direction coincident with the mold cores or the half-shells KHS recesses LV against the higher-lying adjacent sections between successive mandrels. Cover plates DES have, on their underside, a recess ADS which passes through in the x direction and engages over the recesses LV in the upper edge of the core holder strip KLS. The cover arrangements DES are also located above the upper edges of the half-shells KHS and are welded to outer edges with these. The core holder strip KLS has no direct connection between the upper regions of the opposing half shells KHS and the cover plates DES and has a slight play against these components, resulting in a low relative mobility of the core holder strip KLS against the cover plates DES and half shells KHS during the shaking process is ensured and a jump in the bending moment of inertia of the core holder strip is avoided.

The features indicated above and in the claims, as well as the features which can be seen in the figures, can be implemented advantageously both individually and in various combinations. The invention is not limited to the exemplary embodiments described, but can be modified in many ways within the scope of expert knowledge. In particular, the Special constructions of the cores with subdivision by a vertical dividing plane and / or subdivision into an upper us a lower section, The attachment of cores to breakthroughs by the core holder strip with possibly slightly increased height, the implementation of the core holder strip under a closed lid, the special Supporting the core holder in the Formnestwänden marginal Formnester also independently and from the relative mobility of the core holder relative to the side walls of the hollow body advantageously realized.

Claims

Claims:

1. An apparatus for producing concrete moldings having a shape having at least one mold cavity for receiving concrete amount and at least one mold core disposed within the mold cavity, which has a hollow body and is held on a core holder, which is elongated strip-shaped and in a horizontal longitudinal direction spans the mold cavity and passed through opposite side walls of the hollow body and the hollow body against vertical shaking forces in a shaking for solidification of in the

Supported mold cavity filled concrete amount, characterized in that the core holder (HK) in the implementation (KWD) through the side walls (KWx) of the hollow body (FK) parallel to a longitudinal direction enclosing vertical (xz) plane relative to the side walls movable (BH) is.

2. Apparatus according to claim 1, characterized in that arranged in the interior of the hollow body holding means (QS, ST) are provided, which are connected to the core holder (HK) and the hollow body (FK) and via which the hollow body against the vertical Rüttelkräfte the

Core holder is supported.

3. A device according to claim 2, characterized in that the holding means are connected to the hollow body via the side walls thereof.

4. Apparatus according to claim 2 or 3, characterized in that the holding means are connected to the core holder in the longitudinal direction of the side walls (KWx) of the hollow body by a distance (AA) spaced.

5. Apparatus according to claim 4, characterized in that the distance (AA) is greater than 20% of the distance of the bushings (KWD) in opposite side walls (KWx) of the hollow body.

6. Device according to one of claims 2 to 5, characterized in that the holding means comprise at least one of the core holder downwardly leading extension.

7. The device according to claim 6, characterized in that the extension is arranged centrally between the side walls of the hollow body in the longitudinal direction.

8. Apparatus according to claim 6 or 7, characterized in that the extension is formed integrally with the core holder.

9. Apparatus according to claim 8, characterized in that core holder and extension form a flat sheet metal blank.

10.Vorrichtung according to any one of claims 6 to 9, characterized in that the width (BS) of the extension (ST) is less than the height (HL) of the core holder (HK).

11. Device according to one of claims 6 to 10, characterized in that the transitions between the core holder and the extension are designed as curves (RU).

12. The device according to claim 11, characterized in that the average radius of the transitions is at least 10% of the width of the extension after the transitions.

13. Device according to one of claims 6 to 12, characterized in that the extension merges into a vertical web.

H.Vorrichtung according to one of claims 2 to 13, characterized in that the holding means a horizontal strut arrangement (QS) contain, which is vertically spaced from the core holder (HK) connected to opposite side walls (KWx) of the hollow body, in particular welded.

15. The apparatus according to claim 14, characterized in that the strut arrangement (QS) in openings (KWA) of side walls (KWx) of the hollow body (FK) engages.

16. The apparatus of claim 14 or 15, characterized in that the strut assembly (QS) is formed integrally with the web (ST) and the core holder (HK).

1 /.Vorrichtung according to claim 16, characterized in that the strut arrangement with the core holder and the web forms a flat sheet metal blank.

18. The apparatus according to claim 17, characterized in that the height (HQ) of the strut assembly (QS) is greater than the height (HL) of the core holder (HK).

19. Device according to one of claims 14 to 19, characterized in that the strut assembly (DQ) has two parallel struts, between which rests the web with a lower broadening (GA, GB).

20. Device according to one of claims 2 to 19, characterized in that the holding devices are in their course and in the connection with the core holder free of welds.

21. Device according to one of claims 2 to 20, characterized in that the holding devices force-transmitting elastically deformable

Contain damping elements.

22. Device according to one of claims 2 to 21, characterized in that the damping elements are arranged on screw connections of Halteeinrich- lines.

23. Device according to one of claims 2 to 22, characterized in that the holding devices are connected via two longitudinally spaced joints (GC) with the core holder.

24. Device according to one of claims 1 to 23, characterized in that the upper edge (HKO) of the core holder within the hollow body offset downwards (HSO) and extends under a hollow body upwards final cover plate.

25. Device according to one of claims 1 to 24, characterized in that the holding means are connected to the lid of the hollow body.

26. The device according to claim 25, characterized in that the holding means comprise connecting elements (VER), which lead from the lid of the hollow body down to the core holder over under the core holder.

27. The device according to claim 26, characterized in that two connecting elements are arranged spaced apart in the longitudinal direction.

28. The apparatus of claim 26 or 27, characterized in that the connecting elements in each case engage around the core holder in the manner of an open-topped fork on both sides.

29. Device according to one of claims 25 to 28, characterized in that the connecting elements extend transversely to the longitudinal direction opposite lying on both sides of the core holder.

30. The device according to claim 29, characterized in that the connecting elements form an upwardly open U-profile.

31.Vorrichtung for the production of concrete moldings having a form having at least one mold cavity for receiving concrete mold and at least one arranged within the mold cavity mold core, which has a hollow body and is held on a core holder, which is elongated strip-shaped and in a horizontal longitudinal direction spans the mold cavity and passed through opposite side walls of the hollow body and the hollow body against vertical Rüttelkräfte in a shaking for solidification filled in the mold cavity concrete quantity is supported, in particular according to one of claims 1 to 24, characterized in that the hollow body of a lower portion and an upper portion is joined together, wherein the side walls in the lower portion have a downwardly tapering and in the upper portion at least predominantly vertically cylindrical.

32. Apparatus according to claim 31, characterized in that the mold core is supported via the lower portion against the vertical shaking forces on the core holder.

33. Apparatus according to claim 31 or 32, characterized in that the height of the upper portion is substantially equal to the height (HL) of the core holder.

34. Device according to one of claims 31 to 33, characterized in that the lower portion is formed by two half shells as Abkant sheet metal body.

35. Device according to one of claims 31 to 34, characterized in that the upper portion is composed of several parts.

36. Apparatus according to claim 35, characterized in that the upper portion has a side wall portion and a cover plate.

37. Apparatus according to claim 36, characterized in that the side wall part consists of two U-shaped part bodies, which enclose the core holder between them.

38. A device for producing concrete shaped blocks with at least one mold cavity having, on a horizontal surface of a Rüt- lying telplatzlage mold and at least one arranged in the mold cavity mold core, which is held on a core holder, which is strip-shaped elongated in a horizontal longitudinal direction and attached to longitudinally spaced from the mold core points on the wall of the mold cavity, characterized in that the

Core holder extends through the wall of the mold cavity and on the side facing away from the mold cavity side of the wall has an opening and that a wedge extending through the opening braced against the outer surface of the wall, the core holder.

39. Device according to claim 38, characterized in that the wedge is resiliently deformable towards the outer surface of the wall.

40. Apparatus according to claim 38 or 39, characterized in that the contact surfaces of wedge and opening are curved.