EP0932725B1 - Prefabricated reinforced concrete slab and process for manufacturing the same - Google Patents

Abstract

A prefabricated reinforced concrete slab (10) for producing a composite slab construction, in particular a solid track for high-speed trains, has at least two steel rods (19) which extend in the longitudinal direction of the finished reinforced concrete slab (10) and protrude beyond both front sides of the slab (10), each steel rod (19) being immovably anchored within the finished reinforced concrete plate (10) only in one spot and otherwise being freely extensible.

Description

The invention relates to a prefabricated precast reinforced concrete slab to create a Panel construction according to the preamble of Claim 1 and a method for their Production.

Methods are known for producing a so-called fixed carriageway for high-speed rail traffic this with in-situ concrete manufacture. However, it is also a procedure using pre-made Reinforced precast slabs known to their Butt joint with the steel rods concreted in the so-called thermite welding can be connected (DE 26 21 793). Here, first in Partial areas of the butt joint between the end faces of the reinforced concrete precast concrete. After that the formwork for thermite welding in the Butt joint attached and then with welding began. Here, the ends of the steel bars are up heated to approx. 3000 ° C. When cooling, they pull Steel rods together and already crimp them concrete in the butt joint in some areas - between the faces of two neighboring ones Precast concrete panels. After cooling the remaining butt joint after removal of the formwork parts for thermite welding also closed with concrete.

This well-known construction with the thermite welding process has changed in practice essentially proven. The disadvantage is that none are defined Clamping forces when cooling the medium Thermit welding connected steel rods and with it also no permanent connection of the after Thermit welding of the concrete introduced with the both faces of the two adjacent to each other Precast reinforced concrete slabs can be achieved.

The invention is based on the object, a generic Precast reinforced concrete slab for Creation of a plate construction as well as a To further develop processes for their production, that resilience in producing the Composite panel construction adjustable and permanent connections of the total between the concrete placed in the front can be achieved.

This task is carried out with a generic precast reinforced concrete slab according to the preamble of Main claim according to the invention by its characterizing Characteristics as well as through the procedural steps of the main manufacturing claim solved.

According to the invention, precast reinforced concrete slabs with at least two in the longitudinal direction of the Reinforced precast slab extending and over whose two end faces use protruding steel bars, around a composite panel construction by connection the ends of the steel bars of two neighboring ones To achieve precast reinforced concrete slabs. The composite panel construction serves to manufacture the so-called solid road, especially for the High-speed rail traffic, being on the Top of the precast reinforced concrete slabs Devices for attaching themselves in Longitudinally extending rails are provided. However, three or more steel rods can also be used find that are preferably symmetrical with respect to the Longitudinal median plane of the precast reinforced concrete slab may be appropriate, of course identical place, otherwise of course that Connect the butt ends of the Steel bars would not be possible. After one Reinforced precast slab initially Direction and joint spacing on an already installed one Reinforced concrete slab is arranged, the Reinforced concrete slab in its height and orientation adjusted and in this position the butt against each other butting ends of the steel rods, preferably by a welded connection via a Angle rail connected together. The Precast panels are in the outer side area with each face of the precast reinforced concrete slab provided with a paragraph parallel to End face extending abutment, the Surface normal parallel to the longitudinal direction of the Precast reinforced concrete slab runs. This on both outer sides in the area of the face attached paragraphs are used to create a preferably hydraulically operated press there use and in the sense of pushing apart press, tensioning the steel rods. In this tense position is in the range of Butt joint between the two faces of the Precast reinforced concrete slab is a solidifying Filling compound, preferably filled in concrete and then the two hydraulic used in the paragraph Presses relaxes, and consequently the pre-stressed steel rods relax while doing so contract and thereby the entire filling mass in the butt joint between the end faces. This is due to the inventive Anchoring each steel rod in only one place the precast reinforced concrete slab and the rest thereof freely stretchable arrangement the advantage achieved that a constant stretch always in length provided every precast concrete slab and consequently a great resilience to the in the concrete brought into the butt joint can.

With the precast reinforced concrete slab according to the invention or the process for producing a composite panel construction the advantage is achieved that on the one hand, adjustable and defined forces in the Steel bars can then be produced on the one hand, the filling compound in the butt joint between the faces of neighboring precast reinforced concrete slabs constant and defined and because of the im Contrary to the prior art, larger free ones Elongation length of the steel bars with greater force can be biased. As a result a good and lasting connection between the End faces of such a degree together Panel composite construction connected individual Precast concrete panels.

After connecting, you can still use Adjuster adjusted plate with a solidifying Mass, for example concrete underfilled or pressed, so that the adjustment means can be solved.

To prevent the underpressed or underfilled Mass with the bottom of the precast reinforced concrete slab connects, there can be a separation layer to be available. So it is also possible, readjustment even after years undertake without the solidified mass to damage and / or remove.

Further expedient refinements and developments of the invention are in the subclaims characterized.

Fig. 1

eine Stahlbetonfertigteilplatte, in Draufsicht;

Fig. 2

die Stoßfuge zweier benachbart angeordneter Stahlbetonfertigteilplatten, in Draufsicht;

Fig. 3

die Stoßfuge gemäß Fig. 2, in Seitenansicht;

Fig. 4

die Einzelheit IV gemäß Fig. 2, in größerem Maßstab;

Fig. 5

die Stoßfuge gemäß Fig. 2 mit verbundenen Enden der Stahlstäbe;

Fig. 6

die Stoßfuge gemäß Fig. 5, in Seitenansicht;

Fig. 7

die Stoßfuge gemäß Fig. 5, im Querschnitt; und

Fig. 8

die Stahlbetonfertigteilplatte, im schematischen Teilschnitt.

A preferred embodiment is explained in more detail below with reference to the drawing. In this shows:

Fig. 1

a precast reinforced concrete slab, in plan view;

Fig. 2

the butt joint of two adjacent precast reinforced concrete slabs, in plan view;

Fig. 3

the butt joint of Figure 2, in side view.

Fig. 4

the detail IV of Figure 2, on a larger scale.

Fig. 5

the butt joint of Figure 2 with connected ends of the steel rods.

Fig. 6

5, in side view;

Fig. 7

the butt joint according to FIG 5, in cross section. and

Fig. 8

the precast reinforced concrete slab, in a schematic partial section.

Figure 1 shows a plan view of a according to the invention, generally designated 10 Precast concrete panel. On the top 11 are receiving parts 12 for rails and their Mounts provided. You can also Filling openings 13 for filling the adjusted Reinforced precast slab 10 can be used. Furthermore, are transverse on the top, preferably perpendicular to the longitudinal extent 14 Notches 15 are provided, which serve as predetermined breaking points can serve.

At the two end faces 16, 17 are the schematic with 18 designated ends of the in the precast reinforced concrete slab 10 provided (not visible) Steel bars in front of each Precast reinforced concrete slab 10 at an identical location and preferably symmetrical with respect to the longitudinal direction 14 are provided. In the illustrated embodiment 6 steel bars are provided.

Each of these steel bars 19 (Figure 1) is on one Location, for example at location 20 of the (in FIG 1 uppermost steel rod 19) anchored immovably. On the other places, the steel rod 19 is freely stretchable. This is the stretch between two anchor points 20 two associated steel rods 19 of the adjacent reinforced concrete slabs 10 always constant and corresponds to the length of the reinforced concrete slab 10, provided the steel rod 19 in question is on everyone Precast reinforced concrete slab 10 at an identical location anchored.

Each of the two end faces 16, 17 is also with a symmetrical central one and two outer protruding ones Butt joints 21 and 22 provided on have a plane on their free upper surface, the Area normal parallel to the longitudinal extent 14 of the Precast concrete 10 runs. The middle joint 21 serves as a cross anchor for receiving transverse to the longitudinal direction 14 of the precast reinforced concrete slab 10 ongoing loads (Figure 2). Furthermore can, according to the schematic side view Figure 3 shows in the area of the butt joint 23, a Pocket 24 may be provided by the dome of the End faces 16, 17 is formed. So that's one too additional protection against transverse to the longitudinal direction forces created upwards or downwards. The schematic representation according to FIG. 3 is in Figure 6 shown again on a larger scale. Here, the one shown in more detail in FIG Cross-section angular angle rail 25 with two of equal length and at right angles to each other Legs 26 from below against the ends 18 each Steel rod 19 placed and by means of a weld 27 to form a non-positive connection between the two ends 18 of the blunt abutting steel rods 19 connected (figures 6 and 7).

After completion of the total designated 28 positive connection by welding the Angle rail 25 at the ends 18 of the steel rods 19th is then approximately in plan view in the area of Butt joint 23 roughly the image according to FIG. 5.

In addition, the concrete slab 10, like also FIG. 5 shows, with two - in plan view - outer paragraphs 30 provided which a parallel to the end face 16, 17th have extending abutment 31, as in FIG. 4 is shown. In this paragraph, after manufacturing the non-positive connection 28 (Figures 5 - 7) Hydraulic presses 32 used, which at Applying the same with hydraulic fluid a defined force the two neighboring ones Precast reinforced concrete slabs 10 apart from each other press and hold in this position after previously the plate in arrangement, height and extension has been adjusted. Then the butt joint 23 not only in the area of the joints 21, 22, but also in the area of the pocket 24 by means of a solidifying Filling compound, preferably concrete, filled, after which the applied by means of the hydraulic press 32 Expansion force released and the hydraulic press 32 can be removed. Due to this causes the force of the result of the hydraulic presses 32 prestressed steel bars 19 that the two Reinforced precast slabs back in the area of Butt joint 23 under prestressing of those located there Filling mass - slightly - moved towards each other become. The result is a constant and adjustable as well as compared to the stand technology biased with greater force and with Filling compound filled butt joint, which is a permanent Represents connection.

Furthermore, outside the end faces 16, 17 each precast reinforced concrete slab on the underside 33 at least two on one side with respect to the Longitudinal direction 14 adjustment joints open to the outside 34 is provided, which is parallel to the bottom 33 has extending support surface 35. Furthermore, the Adjustment joint 34 through the support surface 35 to Top 11 of the precast reinforced concrete slab 10 continuous Hole 36 on through with an external thread provided adjusting rod 37 which protrudes the bottom a support plate 38 and a Adjustment screw 39, which is on the support surface 35 supports. There is also a filling opening 40 for filling the precast reinforced concrete slab 10 intended. Will a PE round cord 41 on the bottom provided, so can over the filling opening 40th a solidifying mass, for example concrete be filled in. Of course it is too possible, in a manner known per se Prepressed reinforced concrete slabs 10. In order to prevent the solidifying mass from sticking to the Bottom side 33 of the precast reinforced concrete plate 10 connects, a separating layer 42 can be provided. Furthermore, on the bottom is in Joint 43 extending in the longitudinal direction (FIG. 8) provided that for underfilling with the mass Absorption of lateral forces of the Reinforced precast plate 10 is used.

Claims (20)

1. Prefabricated reinforced concrete slab (10) for constructing a composite slab structure, especially a fixed carriageway for high-speed railway traffic with at least two steel rods (19) extending in longitudinal direction (14) over the reinforced concrete slab (10) and protruding beyond the two end faces, characterised such that each steel rod (19) is anchored such that it cannot move at only one point (20) in the reinforced concrete slab (10) and is otherwise free to stretch.
2. Reinforced concrete slab in accordance with Patent Claim 1, characterised such that the ends (18) of the steel rods (19) are arranged in a recess (24) in the area of the two end faces (16, 17) of the prefabricated reinforced concrete slab (10).
3. Reinforced concrete slab in accordance with Patent Claim 2, characterised such that the recess is arranged transversely with respect to longitudinal direction (14) of the reinforced concrete slab (10) such that a pocket (14) is formed at its end faces (16, 17).
4. Pocket in accordance with Patent Claim 3, characterised such that at least two joint locations (21, 22) protruding in longitudinal direction (14) are provided in the area of each end face (16, 17).
5. Reinforced concrete slab in accordance with Patent Claim 4, characterised such that the joint locations (20, 21) exhibit a plane with its planar normal line running parallel with respect to the longitudinal extension (14) of the prefabricated reinforced concrete slab (10).
6. Reinforced concrete slab in accordance with one of the Patent Claims 1 - 5, characterised such that the underside (33) of the reinforced concrete slab (10) features a flat design, if necessary with a joint (43) extending in longitudinal direction (14) for absorbing transverse forces or with ribbing extending parallel to the longitudinal extension (14).
7. Reinforced concrete slab in accordance with one of the Patent Claims 1 - 6, characterised such that the topside (11) of the prefabricated reinforced concrete slab (10) features mounting parts (12) for rails and their retaining fixture.
8. Reinforced concrete slab in accordance with on of the Patent Claims 1 - 7, characterised such that a shoulder (30) that features an abutment (31) running parallel with respect to the end face (16, 17) is provided in the outer side area of each end face of the prefabricated reinforced concrete slab (10).
9. Reinforced concrete slab in accordance with on of the Patent Claims 1 - 8, characterised such that at least two alignment joints (34) open towards the outside are provided on either side with respect to longitudinal direction (14) outside the end faces (16, 17) on the underside (33) of each prefabricated reinforced concrete slab (10).
10. Reinforced concrete slab in accordance with Patent Claim 9, characterised such that the alignment joints (34) exhibit a support surface (35) running parallel with respect to the underside (33).
11. Reinforced concrete slab in accordance with Patent Claim 10, characterised such that the alignment joint (34) features a continuous hole (36) through the support surface (34) up to the topside (11) of the prefabricated reinforced concrete slab (10).
12. Process for manufacturing a composite slab structure, in particular a fixed carriageway for high-speed railway traffic, comprising prefabricated reinforced concrete slabs with at least two inserted steel rods (19), extending in longitudinal direction (14) of the prefabricated reinforced concrete slab (10) and protruding over its two end faces (16, 17), so that the two mutually aligned flush ends (18) of the steel rods (19) of two adjacently arranged reinforced concrete slabs (10) are positively connected and a solidifying filler compound is filled between the two end faces (16, 17) facing each other that solidifies, forming a tight connection between the two prefabricated reinforced concrete slabs (10), characterised such that each steel rod (19) is anchored in such a way that it cannot move at only one point (20) in the reinforced concrete slab (10) and can otherwise stretch freely, that the ends (18) of the steel rods (19) are positively connected together, that consequently the two adjacent reinforced concrete slabs are pushed apart away from each other with defined force of the steel rods (19) and are held in this position, that a solidifying fill compound is then filled into the entire butt joint (23) between the two adjacent end faces (16, 17) of the prefabricated reinforced concrete slabs (10) and that finally the two reinforced concrete slabs (10) held apart with defined force are released under the effects of the resulting restraint of the fill compound.
13. Process in accordance with Patent Claim 12, characterised such that threaded rods with ends connected positively by means of a screw socket with opposing internal threads are used as the steel rods.
14. Process in accordance with Patent Claim 12, characterised such that the ends (18) of the steel rods (19) are welded together.
15. Process in accordance with Patent Claim 14, characterised such that a. steel rail (25) with an angular cross section is used to weld each end (18) of the steel rods (19).
16. Process in accordance with one of the Patent Claims 12 to 15, characterised such that concrete is used as the fill compound.
17. Process in accordance with one of the Patent Claims 12 to 16, characterised such that the height of the reinforced concrete slab (10) arranged in terms of direction and joint spacing is adjusted and underfilled or underpressed with a solidifying compound.
18. Process in accordance with Patent Claim 17, characterised such that concrete is used as the compound.
19. Process in accordance with Patent Claim 17 or 18, characterised such that a separating layer (42) that prevents the connection between this layer and the solidifying compound is used to facilitate subsequent adjustment between the hydraulically bound subbase and the underside (33) of the prefabricated reinforced concrete slab (10).
20. Process in accordance with Patent Claim 18, characterised such that the compound is applied through filler openings (14) extending through the prefabricated reinforced concrete slab (10) to its underside (33).

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