DE29607260U1 - Device for the production of concrete blocks with surface patterns - Google Patents

Description

DR..HAtSJS: UIItTiC M:

03RtJPEAN PATENT ATTORNEY

THIERSCHSTR. 27, D-80538 MUNICH TELEPHONE (089) 225051, FAX {+49}-89-294794

TELEGRAMMS: MAYPATENT MUNICH

H-l-G-3/3213 22 April 1996

Dr.M/wi

Hoesch Basalt Beton GmbH & Co,KG in D-97653 Bischofsheim / Rhön

Device for producing concrete blocks with surface pattern

The invention relates to a device for producing concrete blocks such as paving stones and concrete slabs with specific surface patterns.

Concrete paving stones and paving slabs with different outlines and thicknesses are usually manufactured in appropriate molds that are open on both sides or in an open mold with several chambers, several of which can be arranged next to each other on a table, whereby the fresh concrete that is poured in is compacted by tamping with a tamping hammer and/or by vibrating the filled molds on a vibrating table. The individual stones or slabs are demolded after compaction and harden in the mold. During this production, the stones or slabs are usually given a substantially smooth skin on the surface or surfaces that are free (upper) during molding.

Recently, other types of surface, namely patterned or rough-structured surfaces, have been requested, which are produced by subsequent processing of the finished stone or slab by hammering, washing or sandblasting, which are very labor-intensive, expensive processes that pollute the environment with dust and washing water.

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The matrices must be cleaned after each forming step and are subject to considerable wear during vibration or tamping due to the grinding and scratching effect of the hard aggregates in the fresh concrete.

In a device for producing precast concrete blocks known from German utility model G 72 39 952, a press lower punch carries a matrix made of plastic with a complementary surface structure. Vibration takes place before and after the application of a support plate. The mold can only be removed after the concrete has started to set.

The invention is based on the object of creating a device for producing concrete blocks with specific surface patterns, which can be carried out simply and inexpensively using conventional molding machines and which delivers concrete blocks or concrete slabs with a reproducibly identical surface with a rough structure or any design in controlled, consistent quality and with high productivity.

The device specified in claim 1 and subclaims serves to solve this problem.

It was found that in order to produce concrete blocks with the desired type of surface in a mold, the previously used metal molding punch with a metal matrix on the mold side and/or the lower punch arranged in the mold with a metal matrix can be replaced by a molding punch or lower punch to which a special matrix made of non-metallic material is attached on the mold side.

The invention is further explained with reference to the accompanying drawings, in which:

Fig.l shows a schematic section of a concrete block forming machine with the parts according to the invention;

Fig.2 is a plan view of the forming table of Fig.1 with the forming stamp carrier lifted;

Fig.3 schematically shows a single die carrier on a larger scale, and

Fig.4 shows schematically a single form in section on a larger scale;

Fig.5 is a view of a die of the die carrier of Fig.3 or the lower die of Fig.4 looking towards its patterned side.

In Fig. 1, a typical concrete block production plant is shown schematically. Metal molds 2, which are generally made of sheet steel with any shape, are arranged and held next to one another on the vibrating table 1. These molds are filled with fresh concrete from above.

Above this, an upper part (forming stamp carrier) 4 is arranged which can be moved vertically up and down and which carries the forming stamps 3 on its underside, which in turn carry a die carrier plate 5 and on this a die 6 made of non-metallic material (Fig. 3).

The vibrating table is connected to a vibrating device R. The devices for filling the molds 2 with concrete are not shown. As shown, several molds 2 can be arranged on the vibrating table 1, either adjacent to one another or separately next to one another, whereby the arrangement of the molding stamps is of course corresponding. Lower stamps 7 are optionally arranged in the molds, each of which carries a matrix 6a made of non-metallic material.

The mold-side surface 8 of the matrix 6 or 6a has the desired surface pattern 9 with which the concrete block or the concrete slab is to be provided. This pattern can, for example, reproduce the structure and/or appearance of stones, wood, floor coverings or wallpaper.

The production of the desired concrete blocks is carried out with this machine in the usual way by filling the fresh concrete into the mold or molds 2, in which

if necessary, the lower stamps 7 with matrices 6a are located, and vibrating the concrete for compaction by switching on the vibrating device R, whereupon the upper part 4 is then lowered towards the table 1 so that the matrices 6 penetrate into the corresponding mold and there impact on the surface of the not yet hardened fresh concrete in order to imprint the pattern 9 on this surface. In order to produce a good and sharp image of the pattern, it is advisable to continue vibrating the vibrating table 1 and the molds 2 for a short time with the matrix 6 in place.

The concrete block formed in this way can be demolded (demolded) before it sets, since the matrix made of non-metallic material can be removed immediately after the forming step without any concrete residue sticking to it, so that a flawless embossing remains on the surface of the concrete block. The same applies to embossing on the other surface of the concrete block, which is achieved by a matrix made of non-metallic material arranged on a lower stamp in the mold.

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Claims (3)

Expectations 1. Device for producing concrete blocks, paving stones and slabs made of concrete with a predetermined structure or pattern on the top and/or bottom with at least one open mold arranged on a vibratable table, characterized in that above each mold (2) there is arranged at least one upper stamp (3, 5) which can be lowered onto its opening until it comes into contact with the surface of the fresh concrete poured into the mold and/or in each mold there is arranged a lower stamp (7), to which a special matrix (6, 6a) made of non-metallic material with a structure or pattern (9) complementary to the predetermined structure or pattern on the top and/or bottom of the concrete block is attached. 2. Device according to claim 1, characterized in that the Die (6, 6a) is attached to the forming punch (3, 5) or the lower punch (7) by a special connection. 3. Device according to claim 1 or 2, characterized in that the molding die or dies (3, 5) are jointly fastened to an upper part (4) which can be lowered in the direction of the mold or molds (2).