FI60517B - REFERENCE TO A FRAME ORDER FRAMSTAELLNING AV IHAOLIGA ELEMENT AV BETONG - Google Patents

Description

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1¾¾ Patent oeddelat ^ ^ ^ 1 (51) Kv.ik? /Int.a3 B 28 B 1/08 FINLAND I — FI N LAND (21) Pat * nttlhtk «mu <- P * t« ntMueknln | 781266 (22) HakamlspUvt - An * eknin {Klt (2 ^ .0 ^ .78 * * (23) AlkupUvt — Glkljh * ttdi | 2U.OU.78 (41) Interpreters | ulklMkal - Bllylt off «ntli (25.10.79

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Patent · och registrstyrelsen Anvdkan utlagd odi vtl. * Krtft «n public end 30.10. ol (32) (33) (31) Pyy4 * K | r «Tuoikeu, —Begird prlorltet (71) Induco Cy, Lempääläntie 19» Valkeakoski, Finland — Finland (FI) (72) Kaarlo Efraim Virtanen, Tampere, Finland-Finland The present invention relates to a method for the production of concrete hollow elements, and in particular to hollow core slabs, by feeding concrete into a mold in which at least one pipe is fitted. such to form cavities, by vibrating the element at the stage of its formation with a vibrating beam or the like movable along the surface of the element at least from above and pulling each tube out after the element has sufficiently hardened.

The invention also relates to an apparatus for carrying out this method.

It is already known to manufacture cavity elements by a sliding casting method, according to which the cavities are provided in the concrete tongue elements by means of guide tubes at the end of the feed screws.

On the other hand, the so-called a pipe drawing method in which concrete is poured into a mold fitted with pipes which, when the concrete is sufficiently hardened, are pulled out.

More specifically, reference should be made to the following prior art.

U.S. Patent 3,292,227 discloses a sliding casting machine with a fixed vibrator.

DE 870 818 discloses a fixed vibrator which operates via a liquid.

2,60517 SU patent publication ί + 25 803 discloses a fixed vibrator attached to a tube.

GB patent publications 765,679 and 861,910 describe a mobile or movable vibrator.

FR Patent Publication 1 1 + 91 959 discloses a fixed vibrator system consisting of two fixed vibrator granules.

DE patent publication 2 hik 392 discloses a vibrator which can be moved in a tube by means of wires and the resilient members cooperating therewith which the dizzying masses can strike in order to cause vibration.

The advantages of the sliding casting method can be considered that rigid masses (water-cement ratio 0.28 to 0.33) can be used, whereby the casting speed is high, and that prestressing of the elements is possible. However, the disadvantages of this method are the poor dimensional accuracy, the high purchase price of the equipment used and the difficulty of scouring the size of the element to be manufactured.

On the other hand, the good aspects of the pipe drawing method can be considered good dimensional accuracy, the low purchase price of the equipment and the ease of resizing the element. The disadvantages of this method are again the use of a flexible mass (water-cement ratio of about 0.1+), where the casting speed is low, and the fact that prestressing can hardly be applied.

The object of the invention is to provide a method and an apparatus in which the advantages of the sliding casting method and the pipe drawing method can be combined.

The invention is based on the idea of combining a vibratory beam vibration known from a sliding casting with a pipe tension type casting, so that during casting the pipes are vibrated with vibrators arranged inside them.

More specifically, the method according to the invention is mainly characterized in that the element is vibrated internally by moving a separate vibrator inside each tube in its longitudinal direction, so that the separate vibrator and the vibrating bar at least approximately follow each other during vibration.

The apparatus according to the invention, in turn, is mainly known - of at least one separate vibrator, which is arranged to be displaceable inside the tube in its longitudinal direction and which comprises a vibrator part and a locking part.

- transfer devices adapted to move a separate vibrator inside the tube, and - control devices for controlling the vibration and movement of the separate vibrator.

The invention provides considerable advantages. Because the vibration is efficient, a rigid mass can be used, allowing the mold to be dismantled quickly 3,60517. The vibration is very efficient because as the internal vibration moves in each tube according to the vibrating bar, pressure and vibration are caused at approximately the same point. The new method achieves good dimensional accuracy (t 1.5 mm), high casting speed (1.5 m / min) and both prestressing and static reinforcement can be used. The apparatus according to the invention is furthermore more versatile than the corresponding sliding casting machine or pipe drawing mold. Thus, resizing the element to be manufactured is easy. It can therefore be said that the invention makes it possible to produce "sliding moldings" with a limited mold.

The invention will now be examined in more detail by means of an exemplary embodiment according to the accompanying drawings.

Figure 1 shows one apparatus according to the invention in a side sectional view.

Figure 2 shows a cross-section A-B of the apparatus according to Figure 1.

Figure 3 shows a cross-section C-D of the apparatus according to Figure 1.

The method according to the invention can be applied with an apparatus according to the drawings, comprising a planar structure 5, 16. The concrete feeders comprise a gear 3 running along the rails k, on which a feed hopper 2 and feed control devices 1 are arranged and the feed control devices 1 can be placed. . The vibrating beam 18, like the hopper 2, is displaceable with respect to the mold structure 5 »16, and is adapted to vibrate the element above it. The vibrating bar 18 is preferably connected to the hopper 2 by means of a flexible attachment so that it follows the movement of the hopper 2. The bottom 16 of the mold 5 »16 is further vibrated from below by a fixed vibrating apparatus 17, 21. It should be noted that the mold 5, 16 is completely delimited in the method according to the invention, thus deviating from the Liu imaging method.

In the exemplary case, 10 horizontal steel tubes 6 are arranged in the mold 5, 16 to form cavities in the finished element. After the element has hardened sufficiently, the pipes 6 can be pulled out of the mold by means of a pipe pulling device 7, 1, which e.g. comprises a pipe pulling car 7 running on rails 20 mounted on a rack 19.

A separate vibrator 8,9 is arranged to be moved inside each tube 6, comprising a vibrator part 8 and a locking part 9. This locking part is known per se and operates on the principle of expansion to provide a backlash-free locking between the vibrator and the tube 6. The vibrator 8, 9 can be moved inside the tube 6 likewise by means of a transfer carriage 10 and a transfer arm 12 running on rails 20. The transfer devices 10, 12 are adapted to periodically transfer a separate vibrator 8, 9 inside the tube 6.

The element to be cast is vibrated from above with a vibrating bar 18 movable along the surface of the element. At the same time the element is vibrated from below with the already mentioned vibrating apparatus 17, 21 , 8, 9, and the vibrating bar 18 at least approximately align each other during vibration. The separate vibrator 8, 9, is transferred periodically by means of said transfer devices 10, 12 so that no vibration occurs during the transfer. At each vibration point, the vibrator 8, 9 is securely attached to the tube 6 before the vibration starts. The vibration of the separate vibrator 8, 9 is stopped and the vibrator is moved at least to the level of the vibrating bar 18 in the direction of travel of the vibrating bar and the separate vibrator whenever the vibrating bar 18 has moved a predetermined distance ahead of the previous vibrator 8, 9.

The separate vibrators 8, 9 can be operated either hydraulically or electrically. The operation of the expansion member 9 can be, for example, based on the principle set out in DIN standards 63 ^ 3 and 63 ^.

Preferably, the separate vibrators 8, 9 are moved before each of the lower vibration periods by a predetermined distance in front of the vibrating bar 18. It is also conceivable that the separate vibrators 8, 9 and the vibrating beam 18 follow each other synchronously during vibration, although this solution is obviously not so good that the clearance between the vibrator and the tube 6 tends to deform the tube 6.

It is clear that numerous solutions deviating from the above-described embodiment can be considered within the scope of the invention. Thus, of course, the vibrating bar 18 does not have to follow the attachment of the funnel 2, but can also be separate from it.

Claims (3)

5 60517 Pat ent suction set: A method for producing concrete hollow elements, and in particular hollow core slabs, by feeding concrete into a mold (5> 16) fitted with at least one pipe (6) or the like to form cavities, vibrating the element at least above it with a vibrating beam (1ö) each tube (6) away after the element has hardened sufficiently, characterized in that the element is vibrated internally by moving a separate vibrator (8, 9) inside each bar (6) in its longitudinal direction so that the separate vibrator (8, 9) and vibratory beam (18) during vibration at least approximately aligned with each other. Method according to Claim 1, characterized in that the separate vibrator (8, 9) and the vibrating bar (18) are continuously aligned during vibration. Apparatus for carrying out the method according to claim 1 or 2, comprising - a formwork structure (5, 16), - a concrete feed device (1 to 3) adapted to be displaceable relative to the formwork structure (5, 16), - a vibrating beam (18) or the like, displaceable relative to the mold structure (5, 16), adapted to vibrate the element from above, at least one tube (6) or the like arranged in the mold structure (5, 16) to form cavities, and - pipe pulling devices (7, 1U) for each tube (6). ) after the element has hardened, characterized by - at least one separate vibrator (8, 9) adapted to be moved inside the tube (6) in its longitudinal direction and comprising a vibrator part (8) and a locking part (9), - transfer devices (10, 12), adapted to move a separate vibrator (8; 9) inside the tube (6) and - from a control device (13) for controlling the vibration and movement of the separate vibrator (8, 9). Apparatus according to Claim 3, characterized in that the locking part (9) of the separate vibrator (8, 9) operates on the expansion principle in order to achieve a backlash-free locking.