EP1308254A1

EP1308254A1 - Method and apparatus for the production of concrete pipes

Info

Publication number: EP1308254A1
Application number: EP20010126084
Authority: EP
Inventors: Torsten Benzin; Helmut Kuch; Jürgen MARTIN; Jörg-Henry Schwabe
Original assignee: Institut fur Fertigteiltechnik und Fertigbau Weimar eV
Current assignee: Institut fur Fertigteiltechnik und Fertigbau Weimar eV
Priority date: 2001-11-02
Filing date: 2001-11-02
Publication date: 2003-05-07
Anticipated expiration: 2021-11-02
Also published as: EP1308254B1; US6984118B2; US20030085490A1; DE50101337D1; AT257766T

Abstract

The method involves filling the concrete mix (4) into a shaping device, and condensing the concrete mix within a interspace between two relatively rotated components (5,7) of a condensing tool. <??>An Independent claim is also included for the shaping device.

Description

Field of the Invention

The invention relates to a method for the production of pipes from concrete batches, wherein the concrete quantity is filled into a shaping device for shaping and compacted there with a tool. The invention further relates to arrangements with which the method can be carried out.

State of the art

Vibratory processes are usually used to manufacture pipes from concrete used to compact the concrete. This is done in a vertical Intake form, the walls to shape the outer and inner contours of the Pipe has fresh concrete poured into the space between these walls, which is continuously vibrated. About the vibrations To generate, one or more vibrators are used, mostly in the interior the recording form are arranged. According to the large mass of Such a vibration system must be able to manufacture the entire pipe To set the mass of the concrete quantity and the shape of the absorption in vibration, which is associated with high energy consumption. Add to that a considerable Part of the energy is lost because it does not vibrate in the optimal way Frequency range, but in bending vibrations, causing heat and noise acoustic vibrations is converted. Such vibration methods are therefore noise and energy-intensive, which is caused by the production of concrete pipes combines these procedures with high costs and also health risks.

Another disadvantage of such methods is that the quality of the compression varies can be if the vibrating device with a constant supply of concrete is in operation: Since the one filled in first, located at the lower end of the mold Batch is exposed to vibrations for a longer period of time than the later filled the compression at the lower end is higher, which leads to different material properties leads inside the tube.

An improvement in energy consumption and uniformity of material properties can e.g. achieved with the arrangement described in WO 92/18307 be4 who also uses a vibration process and against each other there are movable inner and outer shaping elements, however actually only the inner shaping elements are moved while that outer element corresponds to a casing. The vibrations are in one Vibrating head of an inner shaping element generated and on a narrow Area limited along the pipe, which in the course of the concrete supply along the Axis of the tube is shifted. To generate the static pressure required for Compaction is necessary, the upper part of the vibrating head has a helical shape and conical shape, and by rotation the batch coming from above transported downwards and due to the taper also the static pressure generated. The compression itself is then achieved through the vibration.

However, the arrangement described in WO 92/18307 also shows the next one State of the art, disadvantages: Here too, vibrations, the generation of which is associated with high energy expenditure and noise, for Compression used. The stress on the material of the shaping device is also relatively high because it is in part of the inner shaping element coupled rotation and vibration movements occur in other parts only Rotations. Due to the construction, the top end is also manufactured a tube usually provided with a tip end contour with difficulties connected. Because the screw-shaped vibrating head towards the end of the manufacturing too If a part protrudes beyond the end of the mold, it is questionable whether it is for compression required static pressure corresponds to that used inside the mold, because not enough concrete can be refilled from above. moreover the inner shaping element can only be laboriously opposite to the production direction be removed again, and possibly material from the Remove the inner contour of the pipe. It is also not for the production of Continuous tubes suitable.

In general, all vibration methods and such methods have implementing arrangements itself has other disadvantages. In addition to noise, the health of the people who are in the vicinity of vibration systems stop, endangered and soundproofing measures is necessary The heavy use of parts of such systems is also a major disadvantage. The vibrations also cause permanent vibration damage, which e.g. can lead to cracks in the casing.

Furthermore, the occurrence of acceleration differences with areas in which the compression due to the construction of the vibration arrangement only insufficient, possible. One is relative to the sheathing moving vibration device, the longitudinal extent of which is shorter than the length of the pipe to be produced, this effect is reduced, but not completely suppressed. Compaction is particularly important in the areas of socket formation generally more difficult than in the rest of the pipe section, even in the sleeves Form zones in which the mixture is compressed to a much lesser extent. Another The disadvantage is the fact that the system's natural vibrations depend on the level depend on the admission form with concrete quantity and change with it. In order to achieve a uniform compression, the voting behavior of the Systems are dynamically adapted to the level, which is very high Effort is connected.

In addition, vibration processes are limits due to the process itself set: A prerequisite for the use of this method is that the concrete quantity can be compacted sufficiently well by vibration. This requirement is however in some batches - for example batches for production of high-performance or fiber concrete - not met. Furthermore, the manufacture Thin-walled pipes associated with difficulties: To the flow of the granular and rather viscous concrete mixture in the area to be filled between the jacket and Vibration core, the diameter of which corresponds to that of the pipe to be manufactured, not to hinder, this area must have a minimum diameter.

Roller head processes are also used to manufacture pipes from concrete batches used. With this method, a rotating press tool compresses the concrete quantity by pressing against a casing. Here, too, is the compression Difficulties in the area of the sockets. Furthermore, the Limited range of processable batch qualities.

Description of the invention

Starting from this prior art, the invention is based on the object to develop a process with which concrete pipes are low noise and efficient at high Quality regarding uniformity and stability of the material properties of the pipe can be produced.

According to the invention, this object is achieved in a method as described in the introduction Art solved in that the amount of concrete in a space between two parts of a tool rotating relative to each other is compressed. there there is both the possibility that only one tool part rotates or both with different Speeds in the same direction. It is particularly effective However, procedure with counter rotation.

This method, which is not very expensive, does without any vibration and therefore points out also does not have the disadvantages of vibration methods. An entry opening of the Intermediate space is added to the concrete, which compresses in the space is: The relative rotation of the tool parts to each other can make the granular Roll components of the concrete batch onto each other, keeping their distance from each other decrease so that when you exit the gap a higher one Have packing density. Because the components of the concrete mix are granular or liquid are friction losses on the rotating tool parts, which are the dominant Share of energy losses in compression, very low and also limited locally. After exiting the gap below The concrete mixture can then be brought into its final form by pressure.

It is useful that the shape for the outer contour of the tube by means a jacket shape and for the inner contour of the tube by means of which is relative the work surface sections provided for this purpose to move the jacket shape he follows. In this way, effective production is possible because there are no more Tools must be used.

Since the amount of concrete in the space is very highly compressed, it is also advantageous, the shell shape immediately after the end of compression and Separate the shape from the tube. So the jacket shape stands directly for the next manufacturing process available.

At this point it should also be pointed out that with the method according to the invention and an arrangement according to the invention also tubes with thin walls can be produced because of the inherent difficulties of the vibration process not occur in this way. In particular, mixtures with special ones can also be used Process properties such as high-performance concrete.

The invention further includes arrangements with which the manufacturing process can be implemented. Such shaping devices comprise a jacket shape to form the outer contour of the tube and a multi-part, with at least a tool connected to compress the tool into the Forming device filled concrete batch and for shaping the inner contour. A first and a second part of the tool are relative to each other driven in rotation. Only one part of the tool can rotate, both parts in parallel with different speeds, or both parts in opposite directions, with same or different speeds. Between a first worktop section the first part of the tool and a second work surface section The second part of the tool has a space between Passage and compaction of the concrete batch. To shape the inner contour, also has a second work surface portion of the first part of the tool the shape of a first outer cylinder with the axis of rotation of the first part of the Tool as an axis of symmetry. The diameter of the first outer cylinder is selected according to the inside diameter of the pipe to be manufactured. By rotating the first part of the tool, the amount of concrete is reduced the compression and emergence from the space into the final form and smoothed at the same time.

It is expedient for the size of the space, i.e. the minimum Distance of the rotating work surface sections with respect to each other for an effective compaction a value that is in the range of the average grain size the grain of the concrete mix lies to choose. Here's a value of about double the average diameter of the largest grains of the concrete mix proven to be particularly effective.

The opposite rotation of two tool parts rotating around the same axis To achieve, it is useful to separate both parts of the tool To drive waves. The first part of the tool is preferred via a Shaft and the second part of the tool via a hollow shaft surrounding the shaft driven. This has the advantage that both parts have a common drive device can be driven, or via two drive devices, the adjacent along the axis of rotation to save space and easily accessible are attached. However, two shafts with two drive devices are also conceivable on opposite sides of the tool.

In an advantageous embodiment of the invention, the tool and the casing shape are mutually opposed slidably mounted. There is also a guide for the tool provided to achieve a relative movement. For example, the jacket shape rigidly fixed and the tool by means of the guide with concrete supply be moved from one end of the mold to the other. First of all, compacted one end of the concrete batch, brought it into its final shape and smoothed it. The tool can be relative to the shell shape along the axis of rotation be moved until the other end is reached and removed there. For one particularly uniform compression and shaping, i.e. high uniformity of the Material properties, is a continuous supply of concrete, rotation and relative movement along the axis of rotation. Another conceivable variant would also be the fixation of the tool and a moving mounting shape. The manufacture of continuous tubes is also included.

The two work surface sections are advantageous in such a shaping device of the two tool parts, between which there is the space for the passage and compaction of the concrete mix, conical shape, the axis of symmetry of a cone with the axis of rotation of the respective tool part and the axis of symmetry of the tube coincides. In doing so you will each not choose a full cone as the work surface section, but only one segment at a time, which corresponds to a cut perpendicular to the axis of symmetry, because in this way there are other worktop sections with different functionality remain available. Due to the conical shape, the space has now via an opening that is oriented to the axis of rotation and another Opening in the direction of the outer area between the tool and the shell shape is oriented, which simplifies the control of the concrete batch flow.

In an advantageous embodiment, the first work surface section has the first Part of the tool on the shape of a first outer cone, which is in the Direction from which the concrete quantity is fed is tapered. In the opposite The second work surface section of the Connect the first part of the tool, which has the shape of a first outer cylinder. Furthermore, in relation to the embodiment just mentioned, it is advantageous when the first work surface section of the second part of the tool is the Form of an inner cone that extends in the direction from the concrete batch is also tapered. The concrete quantity is thus in the direction opening of the intermediate space oriented towards the axis of rotation. On the conical Boundary surfaces of the space roll the granular components of the Concrete batches on each other and are compacted. Then they kick due the pressure of the advancing batch in the direction of the jacket shape oriented opening into the space between the tool and the jacket shape.

In order to achieve an effective compression, it is advantageous that the inside and first outer cone the same cone angle - the acute angle that the cross section a cone with a plane perpendicular to the axis of symmetry - include, or that the cone angle of the inner cone is larger by a maximum of up to 15 ° than the cone angle of the first outer cone, the cone angle of the first Outer cone is preferably in the range of 50 ° to 75 °. Require cone angles that are too large a very extensive tool along the axis of rotation, which results from manufacturing It is impractical to leave the cone angle too small for smaller ones Pipe diameters no effective compression. Is the cone angle of the inner cone larger than that of the outer cone, the space in tapers Direction of transmission, which increases the compaction of the batch, also becomes a stronger pressure built up under which the batch components from the tapered Exit the end of the space into the space between the jacket shape and the tool.

If the cone angles of the inner and first outer cones are chosen the same, then a cone angle of 65 ° is particularly suitable in terms of production.

In order to further increase the compression in the case of the same cone angle and also to improve the batch flow through the gap, it is advantageous on the first outer cone, a depression spiraling around the axis of rotation leave out. Through this spiral depression, the passage of the mixture relieved by the space.

The spiral depression on the first outer cone can take many forms have, but advantageously has the cross section along the axis of rotation Contours of circular sections. Circular contours have the advantage that they have no inner edges in which material could easily stick. she are also the easiest to manufacture, which is beneficial to manufacturing costs of the tool. The edges between the conical surface and recess also be flattened like a tub rim. In the simplest, the The easiest to implement variant have the circles, which are the contours of the spiral Determine the recess on the first outer cone, all of the same radius. It is also useful to place the centers of these circles on a cone to choose horizontally, here is another way of controlling the compression offers if the cone angle of this cone is advantageously equal to that or less than the cone angle of the first outer cone: Has this cone the same cone angle as the first outer cone, so the material is through passed the space and essentially only by rolling on each other compacted. However, this cone has a slightly smaller cone angle than that first outer cone, preferably 60 °, the circular sections fall to the blunt end of the first outer cone flatter, which increases the compression and also builds up a greater pressure than the same cone angle with which the batch finally from the space in the area between the shell shape and the tool is pressed.

In a further expedient embodiment of the invention, a second work surface section has the second part of the tool in the form of a second outer cone on whose axis of symmetry is the axis of rotation of the second part of the Tool corresponds, and which is fed in the direction from the concrete batch is rejuvenated. Because many pipes in order to be able to be nested an end with a larger outer diameter on one side and on the other One end with an outer diameter that - with the same inner diameter is smaller than the outside diameter of the tube in the remaining area, the shape of the jacket tapers in this direction and often ends in a pointed shape, the amount of concrete usually fed from the direction of the tip end shape becomes. If the tool is now moved in the direction of the tip end shape, then the available area between tool and shell shape is smaller. At the same time, the compacted amount of concrete swells through the opening through which it flows out exits the space, also upwards, as it exits under pressure. Due to the conical shape of the second worktop section of the second part of the tool is therefore the action of stronger forces on the tool congestion of concrete during shaping in the area of the tip end shape avoided. This works particularly effectively in the area of cone angles between 65 ° and 83 °, preferably at a cone angle of 77 °.

In this case, it is advantageous if one around the second outer cone Axis of rotation spiral recess is recessed. Through this, when the Area of the tip end shape is reached and the amount of concrete almost this cavity fills in, concrete amount from the pointed end of the form towards the first Part of the tool is transported, and the tool can be easily removed from the jacket shape be removed. Here, too, the spiral depression advantageously has Cross-section along the axis of rotation the contours of circular sections, with the contour-defining circles in the simplest, easiest to implement Variant all have the same radius. The spiral is expedient Depression on the second outer cone designed so that the center points of the circles that determine their contours lie on a cone. It is for one Even transport of the already compacted mixture is advantageous if the cone angle of this cone is the same or one - with a difference of an amount of up to about 5 degrees - a cone angle similar to the second outer cone, preferably 78 °.

To the concrete quantity in the space to pass and compact the Bringing concrete is the second part of the tool on the Side facing the direction from which concrete is fed, with passages equipped to forward the concrete batch into the space. in principle one or more large openings are sufficient. However, to prevent that possibly clumping concrete quantity with only part of the tool runs in the direction of rotation and possibly the gap closes, the passages are designed as slots which are essentially parallel to the axis of rotation of the second part of the tool, advantageous. In this way, the amount of concrete is effectively prevented, only in one Rotate direction of rotation, and clumping batch components are pulled apart until they crumble.

Finally, it is advantageous if a third work surface section of the second Part of the tool for shaping the inner contour is the shape of a second outer cylinder about the axis of rotation of the second part of the tool, wherein the second outer cylinder is the same radius as or a larger radius than the first outer cylinder. The second outer cylinder can do the same Radius are used for preforming and relieve the first outer cylinder. To facilitate removal of the tool, it is advantageous to use the spiral Continue deepening on the second outer cone into the third work surface.

The radius of the second outer cylinder becomes larger than that of the first outer cylinder selected, you can basically manufacture a concrete pipe from two layers, the outer layer being shaped and compressed only by the second outer cylinder becomes. To increase the compression effect, you can use the second outer cone a roller level with tool parts based on the principle of the roller head method work, be provided. The use of a third is also conceivable Part of the tool for compacting the component of the concrete mix for the Outer layer between the second and third part of the tool in the one described above Wise. The component of the batch for the inner layer is in the space between the first and second part of the tool is highly compressed and brought into the final shape by the first outer cylinder.

Brief description of the drawings

The invention will be described below using an example. In the accompanying drawings

Fig. 1: an overall view of a shaping device,
Fig. 2: 3 shows a cross section through the shaping device with an enlarged representation of the intermediate area,
Fig. 3: a holder with a guide for the tool to achieve a relative movement,
Fig. 4: a representation of the first part of the tool,
Fig. 5: a representation of the second part of the tool.

Detailed description of the drawings

1 is the overall view of a shaping device according to the invention shown, which is suitable for performing the method according to the invention. A jacket shape for shaping the outer contour consists of a jacket 1, which is provided with a lower sleeve 2 and an upper sleeve 3. Subframe 2 and Upper sleeve 3 are also used to produce precisely fitting pipes that fit into one another can be inserted, the upper sleeve 3 gives the jacket shape the shape of a point End. The lower part of the jacket is in the area of the lower sleeve 2 concrete quantity 4. The first part 5 of the tool, which over a shaft 6 is still located in the drawing outside the shell shape, while the second part 7 of the tool, which is driven via a hollow shaft 8 is already at the preforming of the concrete batch 4.

2 shows a partial cross section through the shaping device. In the arrangement shown, the second part 7 of the tool is in the direction from which concrete is supplied, arranged over the first part 5 of the tool and partially envelops it. The gap is between the two 9 for passing and compacting the concrete batch. About wave 6 and the hollow shaft 8 can be the first part 5 of the tool and the second part 7 of the tool are rotated independently of one another. The way that the amount of concrete 4 takes is shown as a dashed arrow. It is from Filled in at the top, caught by the second part 7 of the tool and into the space 9 passed where it by rolling off the granular components of the concrete mix 4 is compressed onto each other. After compaction, it occurs at the bottom End of the space 9 radially and under pressure in the area between Shell shape and tool, where through the first part 5 of the tool The inner contour is shaped in this area. The concrete batch 4 will pressed into the area between the jacket shape and the tool until it is filled and the amount of concrete 4 through the opening of the space 9 at the bottom The end begins to rise.

By means of a holder 10, as exemplified in FIG. 3, can then the tool slowly relative to the shell shape along the axis of rotation in the direction the upper sleeve 3 are moved, whereby the entire inner contour is formed becomes. For this purpose, a guide is provided in the example: a spindle 11, which on a Side is driven by a drive device 12 and in on the other side a bearing 13 rests, is via a spindle nut 14 with a cross member 15 the ends of which are carriages 16 connected. The carriage 16 are in Guide rails 17 guided along the direction of the spindle. The cross member 15 is in turn with a drive device 18 for the shaft drive and a drive device 19 connected for the hollow shaft drive via a gear 20.

Fig. 4 shows different views of the first part 5 of the tool with a conical Shape. The first work surface section of this tool part has the shape of a first outer cone 21, the second work surface section in the shape of a first Outer cylinder 22. The first outer cylinder 22 is smooth and is used for shaping the inner tube contour. On the first outer cone 21 is one around the axis of rotation spiral recess 23 recessed. It is used to control the batch feed-through through the space 9: Concrete quantity detected in the upper area 4 is transported downwards and compressed at the same time. In order to prevent batch components from getting stuck in corners or inside edges, the spiral recess 23 has the contours of circular sections in cross section. The centers of the circles lie on a conical surface, the cone angle β is slightly smaller than the cone angle α of the first outer cone 21, whereby the compression can be increased, as can the pressure under which the Concrete amount 4 through the space 9 in the area between the tool and Coat emerges.

5 shows various views of the second part 7 of the tool. The first working surface section of this part has the shape of an inner cone 24. The cone angle γ of the inner cone 24 and the cone angle α of the first outer cone 21 are the same. The second worktop section of this section has the Form of a second outer cone 25. On the second outer cone 25 is one recessed spiral recess 26, the screw direction opposite to of the spiral recess 23. Through the spiral recess 26 supplied concrete batch 4 from the pointed end of the shell shape with the upper sleeve 3 transported in the direction of the first part 5 of the tool. That way allows easier removal of the tool from the jacket shape. To prevent, that batch constituents get stuck in corners or inside edges the spiral recess 26 in cross section the contours of circular sections. The centers of the circles lie on a conical surface, the cone angle ε is slightly larger than the cone angle δ of the second outer cone 25. That side of the second part 7 of the tool, which points in the direction, from the concrete quantity 4 is supplied, is provided with passages 28 through which the amount of concrete 4 is passed into the space 9. Their slot-like shape prevents them a circulation of the undensified concrete batch 4 with the direction of rotation of the first part 5 of the tool. A third work surface section of the second part 7 of the tool finally has the shape of a second outer cylinder 27 which can be used for preforming the concrete batch 4 if this over the opening of the space 9 to the shell shape rises. The spiral In this case, recess 26 also extends over this second outer cylinder 27, which, however, has no influence on the final shape and only should facilitate the removal of the tool.

Another conceivable application of the method and arrangement, which results from the claims is the production of two-layer concrete pipes. This is e.g. then makes sense if requirements are placed on the inner contour of the pipe be for the inner layer the use of a high quality and expensive Make concrete necessary. On the outside, however, these requirements not provided, so that in principle another concrete is used for the outer layer can be. In the arrangement shown, a concrete quantity can also be used made up of two components, which in turn have concrete mix for themselves can be different properties without significant mixing of the Process components if you design the second part 7 of the tool that the radius of the second outer cylinder 27 is larger than the radius of the first outer cylinder 22. The difference between the two radii then determines the Wall thickness of the inner layer. The amount of concrete intended for the outer layer is then directed directly into the space between the jacket shape and the tool, where it is smoothed and compressed by the second outer cylinder 27. To increase the compression effect of the second part 7 of the tool can be on the second Outer cone 25 continues to be a roller plane with tool parts that work on the principle the roller head process, be provided. The high-quality concrete batch, which is intended for the inner layer is the only one of the two Batch passed through the passages 28 into the intermediate space 9, where it compresses becomes. The final contouring then takes place through the first outer cylinder 22 of the inside diameter. It is of course important to ensure that the paths the concrete quantity for the inner and outer layers are separated. For example by means of a hollow cylinder which surrounds the hollow shaft 8, the The hollow cylinder should have approximately the same diameter as the second part 7 of the tool on the side that fed the direction from the concrete batch is owned.

LIST OF REFERENCE NUMBERS

1: coat
2: base ring
3: upper sleeve
4: concrete mixture
5: first part of the tool
6: wave
7: second part of the tool
8th: hollow shaft
9: gap
10: bracket
11: spindle
12: driving means
13: camp
14: spindle nut
15: crossbeam
16: carriage
17: guide rails
18: driving means
19: driving means
20: transmission
21: first outer cone
22: first outer cylinder
23: spiral depression
24: inner cone
25: second outer cone
26: spiral depression
27: second outer cylinder
28: Passage
α: Cone angle of the first outer cone
β: Cone angle for conical surface
γ: Cone angle of the inner cone
δ: Cone angle of the second outer cone
ε: Cone angle for conical surface

Claims

A method for producing pipes from a concrete batch (4), wherein the concrete batch (4) is filled into a shaping device for shaping and compacted there with a tool, characterized in that the concrete batch (4) is in an intermediate space (9) between two relative to one another rotating parts (5,7) of the tool is compressed.
Method according to claim 1, characterized in that the concrete quantity (4) is compacted in an intermediate space (9) between a rotating first part (5) of the tool and a second part (7) of the tool rotating in opposite direction to the first part.
Method according to Claim 1 or 2, characterized in that the shaping for the outer contour of the tube is carried out by means of a jacket shape and for the inner contour of the tube by means of work surface sections provided for this purpose on the tool moving relative to the jacket shape.
Method according to one of claims 1 to 3, characterized in that the jacket shape is separated from the tube immediately after the compression and shaping has ended.
Shaping device for the production of pipes from concrete (4), according to the aforementioned process steps, comprising

a jacket shape for shaping the outer contour of the tube and

a multi-part tool connected to at least one drive device for compacting the concrete mixture (4) filled in the shaping device and for shaping the inner contour, wherein

a first part (5) of the tool and a second part (7) of the tool are driven rotating in opposite directions to one another,

there is an intermediate space (9) between a first work surface section of the first part of the tool and a first work surface section of the second part of the tool, and

a second working surface section of the first part (5) of the tool for shaping the inner contour has the shape of a first outer cylinder (22) about the axis of rotation of the first part (5) of the tool.
Shaping device according to claim 5, characterized in that the size of the intermediate space (9) is preset such that the smallest distance between the first working surface section of the first part (5) of the tool and the first working surface section of the second part (7) of the tool is approximately that Double the average diameter of the largest grains of the concrete mix.
Shaping device according to one of claims 5 or 6, characterized in that both parts of the tool (5,7) are driven by separate shafts, preferably the first part (5) of the tool via a shaft (6) and the second part (7) the tool via a hollow shaft (8) enclosing the shaft.
Shaping device according to one of claims 5 to 7, characterized in that the tool and casing shape are mounted so as to be displaceable relative to one another and a guide for the tool is provided in order to achieve a relative movement.
Shaping device according to one of claims 5 to 8, characterized in that the two working surface sections of the two tool parts (5, 7), between which there is the intermediate space (9) for the passage and compaction of the concrete mixture (4), have a conical shape with the axis of rotation of the respective part of the tool (5 or 7) as the axis of symmetry of a cone.
Molding device according to claim 9, characterized in that the first working surface section of the first part (5) of the tool has the shape of a first outer cone (21) which tapers in the direction from which the concrete quantity (4) is fed.
Molding device according to one of Claims 9 or 10, characterized in that the first working surface section of the second part (7) of the tool has the shape of an inner cone (24) which tapers in the direction from which the concrete quantity is fed.
Shaping device according to one of claims 9 to 11, characterized in that the cone angle (γ) of the inner cone (24) is equal to or up to 15 ° larger than the cone angle (α) of the first outer cone (21), the cone angle (α ) of the first outer cone (21) is preferably in the range from 50 ° to 75 °.
Shaping device according to one of claims 9 to 12, characterized in that the cone angles (α) and (γ) of the inner (24) and the first outer cone (21) are the same, preferably 65 °.
Shaping device according to one of claims 9 to 13, characterized in that a recess (23) which is spiral around the axis of rotation is recessed on the first outer cone (21).
Shaping device according to claim 14, characterized in that the spiral recess (23) on the first outer cone (21) has the contours of circular sections in cross section along the axis of rotation.
Shaping device according to claim 15, characterized in that the circles which determine the contours of the spiral recess (23) on the first outer cone (21) all have the same radius.
Shaping device according to claim 15 or 16, characterized in that the center points of the circles, which determine the contours of the spiral-shaped depression (23) on the first outer cone (21), lie on a conical surface.
Shaping device according to claim 17, characterized in that the conical surface on which the centers of the circles lie, which determine the contours of the spiral depression (23) on the first outer cone (21), has a cone angle (β) which is equal to or is smaller than the cone angle (α) of the first outer cone, preferably 60 °.
Molding device according to one of claims 5 to 18, characterized in that a second working surface section of the second part (7) of the tool has the shape of a second outer cone (25), the axis of symmetry of which corresponds to the axis of rotation of the second part (7) of the tool and which is tapered in the direction from which concrete quantity (4) is supplied.
Shaping device according to claim 19, characterized in that the cone angle (δ) of the second outer cone (25) is equal to or greater than the cone angle (γ) of the inner cone (24), preferably in the range from 65 ° to 83 °, preferably 77 ° ,
Shaping device according to claim 19 or 20, characterized in that a recess (26) which is spiral around the axis of rotation is recessed on the second outer cone (25).
Shaping device according to claim 21, characterized in that the spiral recess (26) on the second outer cone (25) has the contours of circular sections in cross-section along the axis of rotation.
Shaping device according to claim 21, characterized in that the circles which determine the contours of the spiral recess (26) on the second outer cone (25) all have the same radius.
Shaping device according to claim 22 or 23, characterized in that the center points of the circles, which determine the contours of the spiral-shaped depression (26) on the second outer cone (25), lie on a conical surface.
Shaping device according to claim 24, characterized in that the conical surface on which the centers of the circles lie, which determine the contours of the spiral depression (26) on the second outer cone (25), has a cone angle (ε) which is equal to or is similar to the cone angle (δ) _ of the second outer cone (25), preferably 78 °.
Shaping device according to one of claims 5 to 25, characterized in that the second part (7) of the tool on the side facing the direction from which the concrete batch (4) is provided with passages (28) for conveying the concrete batch (4) is provided in the intermediate space (9).
Shaping device according to claim 26, characterized in that the passages (28) are designed as slots which are substantially parallel to the axis of rotation of the second part (7) of the tool.
Shaping device according to one of claims 5 to 27, characterized in that a third working surface section of the second part (7) of the tool for shaping the inner contour has the shape of a second outer cylinder (27) about the axis of rotation of the second part (7) of the tool the same radius as or a larger radius than the first outer cylinder (22).
Shaping device according to claim 28, characterized in that the second outer cylinder (27) has a continuation of the spiral depression (26) on the second outer cone (25).
Shaping device according to one of claims 28 or 29, in which the radius of the first outer cylinder (22) is smaller than the radius of the second outer cylinder (27), characterized in that a device for separately feeding two components of the concrete mixture (4) is provided that only one of the two components is guided into the intermediate space (9), while the other component is guided directly into the space between the jacket shape and the tool.