Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1983-06-10
1985-09-03
Czaja, Donald
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264 71, 264333, 425409, 425415, 425421, 425432, 425456, B28B 108, B28B 300, B30B 928
Patent
active
045391653
DESCRIPTION:
BRIEF SUMMARY
The present invention is concerned with a method in the casting of large-size concrete objects or corresponding elements for compacting high-viscosity mix. The invention also comprises a mould for carrying out the method, which mould comprises a bottom and side walls, as well as, moreover, a deck for bringing the high-viscosity casting mix present in the mould mechanically under pressure.
In prior art, it is known to compact the concrete mix by vibration, or to bring the concrete mix in the mould mechanically under pressure by pressing one wall of the mould against the concrete mix. Thereat, in connection with the pressing action, the wall may additionally be varied between various angular positions. In prior art, it is also known to cast hollow slabs out of high-viscosity concrete mix by means of the slide-cast method. In such a case, the cavities of the hollow slab are formed by means of the slide-casting machine so that no thick wall strengths remain in the slab. It is the presence of the cavities that permits the compacting of the high-viscosity concrete mix in the said slide-cast method. On the contrary, in prior art it has not been possible to cast such massive concrete objects or elements whose smallest dimension is also at least tens, possibly even hundreds of millimeters, out of a high-viscosity concrete mix (water/cement ratio about 0.28 to 0.33).
It is an object of the present invention to permit the casting on site of large-size concrete objects or corresponding elements out of a high-viscosity concrete mix, and the method in accordance with the invention is mainly characterized in that repeated parallel dislocations back and forth are produced in the various regional zones of the mechanically pressurized high-viscosity casting mix present in the mould, and in particular in parallel dislocation planes of the casting mix, by pivoting two opposite mould walls or wall portions as synchronized and always in the same direction in relation to each other or in relation to their corresponding portions provided in pairs, which pivoting takes place around shafts placed at a distance from one another, included in the planes of the said mould walls, and being parallel to each other and to the parallel dislocation planes of the casting mix.
The mould in accordance with the invention is mainly characterized in that two opposite walls of the mould, or portions of these walls, have been fitted as synchronously pivotable always in the same direction in relation to one another or to their corresponding portions provided in pairs, around shafts parallel to each other and included in the planes of the said walls.
The invention comes out more closely from the following description and from the attached drawing, wherein
FIG. 1 is a schematical presentation of the principle of the process of compacting of the concrete mix,
FIG. 2 illustrates the gliding of the thin lamellae or dislocation planes of the concrete object to be compacted, in relation to each other in a cubic cast piece, the lamellae being placed one above the other,
FIG. 3 is a schematical presentation of a casting mould as viewed from above,
FIG. 4 shows a section at A--A in FIG. 3, and
FIG. 5 shows a mould construction alternative for the mould shown in FIGS. 3 and 4, as a sectional side view.
In FIG. 1, it is assumed that the object to be compacted out of high-viscosity concrete mix has the shape of a cube, shown in full lines. In order that the high-viscosity concrete mix should be really compacted in all parts of the concrete object, in the concrete mix an efficient dislocation of all of the areas in the mix in relation to each other must be produced throughout the entire object. According to the invention, this is achieved so that the concrete mix is first brought mechanically under pressure and that thereafter, in parallel dislocation planes in the concrete mix, repeated parallel dislocations back and forth are produced by synchronously pivoting two opposite mould walls in relation to each other. In FIG. 1, the paths of movement of the two wall pl
REFERENCES:
patent: 3639550 (1972-02-01), Darmochwal
Czaja Donald
Lorin Hubert C.
Oy Partek Ab
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