Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1993-04-21
1994-12-13
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264256, 264265, 264275, 264277, 2642791, B28B 116
Patent
active
053727690
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of producing concrete elements, and more specifically to a method of producing slab-shaped concrete elements which are intended to form or to be a part of a structural member in wall or floor structures.
Such concrete elements have long been known. The elements normally comprise a slab-like body having planar sides and being of uniform thickness and provided with filling bodies. The elements are normally manufactured by pouring concrete into a horizontal mould or form, wherein a part of the element which contains one or more filling bodies is cast in a first manufacturing stage. Subsequent to solidification of this first part of the concrete element, it is turned upside down and lowered into a mould which contains fresh concrete, whereafter the fresh concrete is caused to harden. The volume of fresh concrete poured into the mould corresponds to the desired thickness of the concrete element. The concrete poured into the mould is vibrated and then allowed to harden.
One very serious problem with such manufacturing methods is the difficulty found in achieving uniform qualities with regard to the thickness of the concrete elements produced. This difficulty is caused by the difficulty of controlling delivery of the concrete to the mould, such that the mould is filled with the same amount of concrete on each occasion. Because of these variations in the thickness of the cast concrete elements, it is necessary to smooth and level the surface of the wall or floor constructed from said elements with filler, etc.
This problem is solved by means of the present invention, which provides a technique in which concrete elements of precisely the same thicknesses are obtained.
The present invention thus relates to a method of manufacturing slablike concrete elements having mutually parallel sides and containing one or more filling bodies, wherein the part of the element which contains the one or more filling bodies is cast in a first manufacturing stage and allowed to harden, and wherein said hardened part is turned upside down and lowered into a mould which contains fresh concrete in a second manufacturing stage and the fresh concrete is allowed to harden. The method is characterized in that in the first manufacturing stage the concrete is poured into the mould to a level such that the upwardly facing side of each filling body will be free from concrete; in that the free surface of each filling body has provided therein recesses whose combined volumes corresponds to the variation which occurs in the amount of concrete poured in the second manufacturing stage; and wherein in the second manufacturing stage said first part is lowered into the mould to a level at which the element has a nominal thickness.
The invention will now be described in more detail with reference to an exemplifying embodiment thereof and with reference to the accompanying drawing, in which
FIG. 1 is a cross-sectional view of a portion of a concrete element during its manufacture; and
FIG. 2 is a cross-sectional view of a concrete element shown by way of example.
FIG. 1 is a cross-sectional view of part of a concrete element shown in FIG. 2. The finalized concrete element 1 has the form of a slab, having two mutually parallel upper and lower sides 2, 3 and containing one or more filling bodies 4. A part of the element which contains one or more filling bodies is cast in a first stage of the manufacture of the concrete element, this concrete element part being the upper part 5 shown in FIG. 1. During this first stage casting process, the side 2 forms the lower surface and concrete is poured into a mould to a level shown by the chain (phantom) lines 13, for instance. Subsequent to having hardened, this first part 5 of the concrete element is turned upside down to the position shown in FIG. 1 and is lowered into a second stage mould containing fresh concrete, whereafter the fresh concrete is allowed to harden. The complete second stage mould 6 is shown in FIG. 2.
According to the invention, in the first stage of man
REFERENCES:
patent: 841749 (1907-01-01), Wells et al.
patent: 862440 (1907-08-01), Bradford
patent: 2443961 (1948-06-01), Pelatowski
patent: 3653170 (1972-04-01), Scheckler
patent: 4141946 (1979-02-01), Rauenhorst
patent: 4186536 (1980-02-01), Piazza
patent: 4280974 (1981-07-01), Piazza
patent: 4318258 (1982-03-01), Heck
patent: 4394201 (1983-07-01), Haeussler
patent: 4479916 (1984-10-01), Blatchford
patent: 4548007 (1985-10-01), Newman
patent: 4841702 (1989-06-01), Huettemann
patent: 5186883 (1993-02-01), Beall, III
Aftergut Karen
CBT, Concrete Building Technology AB
Nies, Kurz Bergert & Tamburro
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