DE2007292A1 - Reinforced concrete slab - Google Patents

Description

Frankfurt am Main BUrchaus on Kunrplat? OüNIA INTERNATIONAL BUILDING SYSTEMS

London, England ♦♦♦♦♦♦♦

Reinforced concrete slab.

The invention relates to a reinforced concrete slab, such as ferry track plate for bridges, working platforms or the like, which are made from prefabricated, as permanent formwork Serving reinforced concrete components and an in-situ concrete layer poured thereon and is located between the Main girders of the construction.

It is known, among other things, for the pavement slabs Bridges through a lost formwork in the form of to produce metal slabs or preformed concrete slabs,

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which are then poured with in-situ concrete. If the formwork consists of prefabricated concrete slabs, will the strength of the concrete in these slabs was not taken into account when calculating the strength of the roadway slab. If these token slabs also contain steel reinforcement, this is used only to obtain the necessary rigidity in their function as steel plates. The reinforcement required for the deck is especially above it the steel plates, laid separately from them and then embedded in the in-situ concrete. This results in effort and expense Weight-wise known disadvantages which are to be eliminated by the new invention.

According to the invention, this is achieved in that the reinforced concrete slab is made from individual, closely spaced, prefabricated reinforced concrete strips of rectangular cross-section, the individual strips having a Lay out the façade reinforcement, the lower part of which in the bar and the upper part of which is embedded in the in-situ concrete.

As a result, with simple means, a level of strength is achieved A well-used, quickly executable construction is achieved, whereby the costs are by no means higher than in the above-mentioned cases.

The new type of reinforced concrete slab is mainly suitable for deck slabs of bridges, but it can also be used successfully for all applications

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where θβ is important to create a xchxxs heavy load-bearing surface that extends over a relatively large span without the need for bracing in every x area of the span. -

In a special embodiment of the invention it is provided that each bar contains at least one framework girder, the lower chords of which are embedded in the bar, which has downwardly inclined surfaces on both sides of the girder after the hand of the bar. If the new lines are laid lengthwise next to each other, they form a coherent formwork whose surface is not even, but rather, due to the marked inclined surface sections between two trough-like rims, form an approximately triangular cross-section, which has a good Anchoring of the in-situ concrete. At these points, in the area of the trough-like depressions, the thickness of the original concrete layer is greater than in the other areas and this gives the possibility of absorbing higher shear stresses. It is also possible to lay some or all of the additional tensile reinforcement bars of the slab in the area of the mentioned recess and indeed below the surface of the prefabricated strips, if this is desired. The above-mentioned greater thickness of the in-situ concrete layer in the area of the depressions or the trough-like pills between the ridges prevents the creation of weakened areas in the area of the Staifix abutting edges of most.

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“If the circumstances so require, the individuals can Last also contain more than one adversary.

Exemplary embodiments of the invention are shown in the drawing shown and indeed show:

Flg. 1 a chemically represented ₍ external

cut through a reinforced concrete slab according to finding with prefabricated reinforced concrete strips;

Fig. 2 shows a cross section through a plate with

another embodiment of the strips;

Flg. 3-5 show a cross-section and a side view, as well as a plan view of a deck slab for backs, in which a further embodiment of the reinforced concrete strip is used.

According to FIG. 1, the truss 11 is provided with two internal belts 12 embedded in the prefabricated.> Concrete molding 13. More longitudinal bars 12Λ are on the underside of the beam attached and also embedded in the bar. in the In the area of the carrier 11, the bar has a central horizontal one elevated top 14, while inclined surfaces 15 adjoin on both sides of the carrier, which after the Hand falling down the groin, like an execution leg game, which has proven particularly effective in practice, a bar of e 1 wa 30 cm wide is used.

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raised top 14 takes up about the middle third of the width, while the two inclined surfaces each? make up about the two outer thirds. The greatest strength of the strip beträg about ^f t> cm, the outwardly to about 2 cm decreases the Stoükanten. These dimensions are of course not necessarily the effect of the invention.

. Several of these strips are laid close together and form the formwork for receiving the in-situ concrete 16 to form the road surface. The in-situ concrete layer 16 contains Reinforcing bars running across and lengthways in two planes 17 and 13 to reinforce the plate, with the »uerstube run parallel to the - »- rails 13. The would in the lower level, in part in the trough-like depressions 19t, those lying next to one another due to the inclined surfaces 15 are located ! strips 13 are formed. The longitudinal bars 18 in the upper level are directly below the overstraps 10 of the Truss 11.

The underside of the strips can be smooth or patterned, depending on the intended use, and thus a subsequent one To save work. The surfaces 14 and 15 on the upper side can be rough or provided with protrusions or depressions who len to have a good connection with the in-situ concrete create, as appropriate, the toliflnchen 22 of the linen bevel.

with the orientation devices, the design of the lot βλ is possible, Concrete reinforcement bars for the plate m parallel to the Bars run at the appropriate place in the area

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of the wells 19 to be attached. In certain cases this eliminates the overlap that would otherwise be required Avoid in the «over-reinforcements. Due to the improved connection between the in-situ concrete and the prefabricated All in all, a uniform construction is created, in particular because the bars not only serve as formwork, but are also used as a load-bearing structure.

In the truss 11 of FIG. 1, the lower chords and the longitudinal bars 12, 12A located in this area are arranged somewhat differently. The bar 13 has a slightly different shape. One of the beveled abutment surfaces on each side 22 of the bar can be omitted, since the outer edge of the inclined surface is shifted slightly upwards. The upper chord 10 of the truss 11 lies in this example below the upper level of the longitudinal reinforcements 18 of the plate.

Further changes and adaptations to the respective circumstances are within the scope of the present invention. While, for example, in the exemplary embodiment described, the diagonal struts 23 of the work carrier 11 at the lower end are outwardly directed sections 24 have, which are embedded in the "" bar 13 can these are also lengthened and extend over the inclined surfaces 13, if desired, and here under certain circumstances be provided with further longitudinal reinforcements 12 outside the bar. If in this case the in-situ concrete is poured, the protruding sections are embedded, which continues to provide an improved connection between the cast-in-place concrete

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and the last is created.

There is also the possibility of using wide strips 13 which contain two or more framework girders 11, lying next to one another in parallel,. An arrangement with two lattice girders each is shown in the figures 3 bie ^l j> . The hand areas of these bars have relatively steeply inclined surfaces 20 to which the inclined surfaces 21 adjoin. In the area between two lattice girders of a bar, the surface of the bar is flat, but pressure-relief depressions can also be made in the intermediate area, the depth of which, however, is less than that of the recesses 2 ^r ) between two bars.

Such wide most can even have additional transverse reinforcement except for the lower straps 12 and 12A of the wearer, and the ends of these excess currencies can become also extend over the inclined planes 20 in the in-situ concrete. Here it is beneficial to bend the protruding ends upwards to an angle that is slightly smaller than a right angle, and guide them a little over the top edge of the adjacent bar, aligning them with the Cross the protruding ends of the reinforcements of these adjacent strips. This gives an extraordinarily good one Connection between the in-situ concrete and the ridges in the area of the imperfections.

Figures 4 and '; veransolnul i. "- oh'.ui din arrangements of 1 '* /.-VtT-(IhOM (U ¹ M Hau] 1 ifi ^ nrn ? ^ ojner Brück ··.'. only

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... BADORfGINAL

it is desirable that the prefabricated token strips are placed on top To avoid on the steel flanges of the beams 26, the - ^ eisten can be dimensioned so that they only bir. to the flanges 29, while the Steel truss 1 over the land of the strips, in particular protrude with their lower chords and rest on the flanges 29, optionally with the interposition of Support bearing rods 28.

If, on the other hand, the main girders of the bridge are made of reinforced concrete, one can also use the linden of the - ^ concrete strips 13 directly support on the beams.

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ÖAD ORJGiNAL

Claims (1)

P A T E N T A N 3 P H ü C H Ii 1.) Reinforced concrete slab, such as a roadway slab for bridges, Arbeltsbühne or the like, which consists of prefabricated reinforced concrete parts serving as permanent formwork and an in-situ concrete layer poured onto it and extends between the main girders of the construction, as it is characterized by the fact that the plate consists of individual, closely spaced, prefabricated reinforced concrete strips (13) with a rectangular cross-section who weep unified reinforcement 411), ■■ whose lower part (12) is embedded in the - "bar (13) and whose upper part (10) is embedded in the in-situ concrete (1 <>). Plate according to claim 1, characterized in that each rivet (13) contains at least one chassis carrier (11), the lower chords (12) of which are embedded in the bar (13) which are close to the bar on both sides of the carrier (11) has downward sloping surfaces (15, 20). Plate according to claim 1 or 2, being toothed by the knuckle. d «ü the bar (13) more than one parallel next to each other 0 0 9 8 U 9/1 2 3 1 -11- has lying truss (11). 4. Plate according to one of the preceding claims, characterized . that the abutting edges (22) of the bar (13) are beveled. 5. Plate according to one of the preceding claims, characterized in that the underside of the strips (13) is smooth and the top is rough or provided with projections or depressions. 6. Plate according to one of the preceding claims, characterized in that the prefabricated concrete strips (13) contain main reinforcements. 7. Plate according to one of claims 2 to 6, characterized in that at least one l'eil of the main reinforcement part of the plate in the in-situ concrete, namely in the trough-like depressions between two adjacent concrete strips, in part. below the upper edge of this "" bars (13) are arranged. 8. Plate according to one of claims 2 to 7 » daduroh / cekennzeloh net that see reinforcements in the Untergurtbereieh dta Paohwerk-; support ittl (11) extend laterally over the inclined surfaces (15, 20) of the strip into the in-situ concrete (16) 9. Plate naoh one of claims 3 to 8, characterized in that the "" bar (13) has two parallel trusses (11), between which there are 009849/1 231 - 11 - there is a troy-like depression at the top of the bar. 10. ' Plate according to one of the preceding claims, characterized by the fact that the strips (13) are supported on the main steel girders of the construction as the trusses protruding from the ends of the strips. 0 0 9 8 /; 0 / ι. "M