EP2459813B1 - Reinforced concrete component reinforced with l-shaped sheet metal pieces - Google Patents

Description

The invention relates to a reinforced concrete component having at least one upper and at least one lower Längsbewehrungslage, and a transverse force reinforcement, which is guided in its extension over the uppermost and lowermost longitudinal reinforcement, according to the preamble of claim 1.

In the case of steel or prestressed concrete components, shear reinforcement is often necessary in the area of bearing points, in particular in the area of column connections, for receiving the transverse forces occurring there as a result of the column forces.

Such shear reinforcement elements are largely known in the form of S-hooks or temples, dowel strips, double-head bolts, underwires, lattice girders, Tobler Walm, Geilinger collar and tear Stem.

For reasons of poor anchoring, shear reinforcement in the form of S-hooks or stirrups must enclose a mostly existing longitudinal bending reinforcement in order to prevent the shear reinforcement from tearing out. This to lay is very expensive and therefore also costly. At high degrees of reinforcement of the bending tensile reinforcement and high shear reinforcement proportion conventional ironing are considered no longer installable.

At the, from the DE 27 27 159 A1 known dowel bar, the dowels are provided at their end with a widened dowel head. The dowels are welded with their other end with a dowel retaining rail. A further development of such a dowel strip is for example from the DE 298 12 676 U1 known. This dowel strip has a plurality of mutually spaced dowels having a plate-shaped widened dowel head at one end of its dowel shaft and which are fastened to a common dowel retaining rail at the other end, wherein the respective dowel shaft extends through a dowel bore of the dowel retaining rail and provided with a rivet head is. See also WO 2006/061461 A1 ,

Although such dowel strips have long been used in many ways, it has been found in practice that these dowel strips fail with strong thrust forces, since the dowels then bend. As a result, the bond between concrete and reinforcement is also loosened, a durability of the reinforced concrete component is not always given.

Double head bolts consist of a cylindrical bolt and a relative to the bolt enlarged, above or below lying bolt head, which is usually formed approximately frusto-conical in each case. Several such bolts are connected via a set on the lower or upper bolt head spacer bar to a shear reinforcement element, wherein the spacer bar for the correct orientation and the correct height position of the double-headed bolt in the installed state.

A disadvantage of this shear reinforcement element is that the production of double head bolts is quite expensive and, for example, by upsetting the bolt ends to produce the bolt heads or by welding the frustoconical bolt heads to the bolt.

In addition, the double headed bolts are usually threaded from above in a star shape between the upper and lower layers of the longitudinal reinforcement. With high degrees of reinforcement of the bending tensile reinforcement and different mesh sizes of the upper and lower reinforcement layer, the installation is very difficult, sometimes even impossible.

Tobler Walm and Geilinger collars are steel components that consist of welded-together steel profiles and are manufactured individually. Due to the high weight of the hoisting equipment, the installation parts must be moved. The production and installation are complex and costly, since this lifting tool is not available for other tasks on the construction site during the time of installation, or must be kept extra. Due to their size and weight, these solutions can not be used in prefabricated parts, since otherwise the transport to the construction site would no longer be economical. These reinforcing elements can therefore only be used for reinforced concrete components, which are manufactured in cast-in-situ construction.

The object of the invention is to overcome these and other disadvantages of the prior art and to provide a reinforced concrete component with which also large shear forces or transverse forces can be absorbed. The steel or prestressed concrete part should also be inexpensive to produce and easy to install. Ideally, it should also be manufacturable as a finished part.

Main features of the invention are set forth in the characterizing part of claim 1 and claim 18. Embodiments are the subject of claims 2 to 17 and 19 and 20.

In a reinforced concrete component having at least one upper and at least one lower longitudinal reinforcement layer, and a transverse force reinforcement, which is guided in its extension over the uppermost and lowermost longitudinal reinforcement, the invention provides that the transverse force reinforcement of at least 20 L-shaped sheet metal parts of structural steel and thereon attached ironing is formed. The advantageous inventive design of the transverse force reinforcement of at least 20 L-shaped sheet metal parts and attached ironing ensures due to the large number of elements for a good bond between the concrete and the reinforcement. Such a reinforced concrete component is inexpensive to manufacture and very stable. The composite effect is also reinforced by the L-shape of the sheet metal part and a bracket attached to it because the sheet metal part in combination with the bracket complexed in concrete.

The cost of producing the reinforced concrete component are extremely low due to the inventive design of the transverse force reinforcement, since commercial structural steel can be used. Due to the simple geometry of the L-shaped sheet metal parts, they can be manufactured in a series production as freely falling stamped parts. It is through no welding operations, screw connections or solder joints necessary. The manufacturing costs of a reinforced concrete component according to the invention are significantly reduced by this embodiment, especially since the brackets are also made of inexpensive structural steel. The transverse force reinforcement of a reinforced concrete component according to the invention is thus quickly mounted on the site, inexpensive to manufacture and installation, as no special skills or skills are necessary.

At the same time the puncture resistance of the reinforced concrete component at the same time the puncture resistance compared to conventional constructions is significantly increased because lateral forces and moments are better absorbed and distributed more favorably in the reinforced concrete component. Thus, cracks caused by lateral force remain small and the load capacity of the reinforced concrete component can be significantly increased compared to conventional solutions.

Another significant advantage is that the thrust transmission in the composite joint, which must be demonstrated in element ceilings, can also be taken over by the sheets.

The embodiment of the invention also offers the advantage that only one sheet size must be kept. Even with different ceiling thicknesses and the necessary adjustment of the shear force reinforcement to the ceiling cross section, the same sheet metal parts can be used. It is only necessary to adjust the strap lengths. As a result, maintenance costs can be minimized, construction costs are significantly reduced.

In elementary floor production in the precast plant, the same sheet metal parts can always be used. For this one chooses a sheet length, which still protrudes from the finished ceiling. Only at the construction site, the shear force reinforcement is completed by hanging the bracket. This reduces the component height of an element ceiling. It can therefore be transported more element ceilings simultaneously, which transport and other logistics costs are reduced.

Preferably, the transverse force reinforcement is formed from at least 50 sheet metal parts, more preferably from at least 70 sheet metal parts. The tension in the reinforced concrete component can be distributed very homogeneously due to the large number of sheet metal parts, which further increases the load capacity and ensures higher ductility in the component.

In order to further improve the composite effect of the transverse force reinforcement in the reinforced concrete component according to the invention, each sheet metal part has a fold at one end. The fold is guided to the lowest longitudinal reinforcement. This embodiment of the invention provides for a better stress distribution within the shear force loaded zones of the reinforced concrete component, since the bond between sheet metal part and surrounding concrete is improved. The bracket attached to the sheet metal part protrudes beyond the uppermost longitudinal reinforcement, so that the transverse force reinforcement, which is formed from the L-shaped freely falling sheet metal part and the bracket attached thereto, extends over the uppermost and lowermost longitudinal reinforcement. The transverse force flow can thus be distributed over almost the entire reinforced concrete component ceiling.

The fold of the sheet metal part is preferably located on the side facing away from the iron and is guided to the lowest longitudinal reinforcement. This embodiment of the invention provides for a better stress distribution. The, in cross-section L-shaped sheet metal part engages with the fold the lower bars of the longitudinal reinforcement layer, so that a slip-poor anchoring of the punching shear reinforcement in the pressure zone is achieved by the sheet metal part. In the concrete draw zone this is achieved by the bracket.

Particularly preferred are two circular recesses formed within the fold. Concrete can penetrate through these circular recesses and thus provide a toothing of the sheet metal part with the concrete. The reinforced concrete component is thus extremely durable. Furthermore, the sheet metal parts are thus firmly anchored and do not move when pouring the concrete.

A guided through each recess longitudinal reinforcement rod of the lower longitudinal reinforcement according to the invention improves the carrying capacity of the reinforced concrete component, as obliquely introduced forces on the composite effect between the sheet metal part and longitudinal reinforcement rod are divided into a normal force component and lateral force component. The reinforced concrete component thus has a further increased ductility.

Particularly advantageous is the embodiment of the invention such that the bends are formed with additional recesses. As a result, the composite effect between the sheet metal parts and the concrete in reinforced concrete component is further improved, the load capacity of the reinforced concrete component is increased again.

Advantageously, each sheet metal part has a thickness of 3 or 5 mm. Tests carried out on the basis of carrying capacity have shown that, due to different thicknesses selected, it is not the optimum ratio of lateral force carrying capacity to the composite effect that is achieved. In addition, the provision of only two sheet metal parts has a particularly favorable effect on the material costs. The sheet metal parts do not need to be specially adapted. Rather, they can be manufactured as needed, thereby avoiding storage and storage costs for different sheet metal parts.

According to the invention, in a preferred embodiment, the sheet metal parts, including brackets connected thereto, are arranged uniformly around a region with a high transverse force load. Thus, the design of the reinforced concrete component can be done with simple means and existing possibilities. A comprehensive calculation for each individual case can thus be avoided. According to the invention it is also advantageous if the sheet metal parts are arranged parallel to each other. As a result, simple geometries, which are useful for the design of the reinforced concrete component realize. The inventive construction of the reinforced concrete component is thus easy to manufacture and inexpensive.

The arrangement of the sheet metal parts, which serve as a reinforcement, concentrates when installed in a reinforced concrete component in a core area. The arranged there large, executed by the sheet metal reinforcement amount significantly increases the puncture resistance of the concrete component. At a greater distance to the core area, which is ideally in the zone of the strongest lateral force load, z. B. in a column area, the number of sheet metal parts can be advantageously reduced. The tangential distances of the reinforcement components can then be increased with increasing distance from the core region.

Advantageously, the invention provides that the bracket is mounted in a longitudinal recess of the sheet metal part. The longitudinal recess is easy to produce, since the sheet metal parts - as mentioned above - are manufactured as freely falling stampings. The longitudinal recess can thus be easily punched out of the sheet.

Furthermore, a fast connection on the construction site is possible because the hanging represents the fastest method of connection. In addition, the composite effect of the component by the encapsulation of existing sheet metal part and bracket transverse force reinforcement is increased by this longitudinal recess, as concrete between the remaining space the longitudinal recess in the sheet metal part flows during the concreting process and after curing of the concrete completely fills it.

To produce a reinforced concrete component according to the invention, it is advantageous if the longitudinal recesses in the sheet metal part has a securing position for the bracket. This avoids that during the concreting process, the bracket is moved in its position relative to the sheet metal part.

Particularly advantageously, the position assurance is designed as a detent, resulting in a quick assembly and thus to save working hours. The construction costs of a reinforced concrete component according to the invention are thereby reduced.

Particularly preferred per sheet metal part two brackets are attached to this. As a result, higher Querkraftbewehrungsgrade can be achieved without much additional installation effort. Before concreting two brackets are inserted in a longitudinal recess of a sheet metal part instead of a bracket.

Particularly advantageously, the invention provides that the brackets are made of structural steel with a diameter of 6 mm. This value determined according to the invention with a large number of experiments also has many advantages. So high bond strengths can be achieved. At the same time, installation on the construction site is easy because rebars of this thickness can easily be deformed by a few millimeters. Even complicated geometries are thus easy to defend.

Particularly preferably, the brackets are simply on the upper longitudinal reinforcement and extend through it. As a result, the brackets, as part of the shear force reinforcement not necessarily be additionally secured in position. The assembly cost is further reduced, which reduces the cost of producing a reinforced concrete component according to the invention.

It is particularly advantageous that the bracket are mounted in an angular position to the respective sheet metal part are pivoted to 45 °. As a result, it is ensured according to the invention that as few bracket sizes as possible must be provided.

Thus, the same brackets for reinforced concrete ceilings with thicknesses of 18 cm or 20 cm can be used. The storage on site can be reduced which contributes to further cost reduction in the manufacture of the reinforced concrete component.

Particularly preferred is the reinforced concrete component if the strap length (h _B ), with a component thickness (h) less than 24 cm, the value of the equation h _B = (hc _o -c _u -7.5) * 1.06 corresponds. Likewise advantageously corresponds to the strap length (h _B ), with a component thickness (h) greater than or equal to 24 cm, the value of the equation h _B = h - c _o -c _u -6.5. Here, c _o corresponds to the upper concrete cover and c _{u to} the lower concrete cover.

So trained reinforced concrete components always have an optimal support ratio, since the bracket is always at a favorable angle and thus enters into a good bond with the surrounding concrete and thus is not pulled out of the slot of the sheet.

erfüllt ist.Particularly advantageous is the embodiment of the invention such that the shear force reinforcement is formed from as many L-shaped sheet metal parts made of structural steel with attached ironing that the equation $\frac{\mathit{\beta }\cdot {\mathit{V}}_{\mathit{Ed}}}{{\mathit{u}}_{\mathit{crit}}}\le v_{\mathit{Rd}.\mathrm{Max}}$

is satisfied.

• u_krit der Umfang des kritischen Rundschnitts nach Abschnitt 10.5.2 von DIN 1045-1 unter Berücksichtigung nachstehenden Angaben, wobei DIN 1045-1, Abschnitt 10.5.2(14) hier keine Anwendung findet.

Here are:

• the _critical circumference according to section 10.5.2 of DIN 1045-1 is taken into account taking into account the following information, whereby DIN 1045-1, section 10.5.2 (14) does not apply here.

The critical round cut must be made in accordance with DIN 1045-1, section 10.5.2 for inner supports as well as supports near openings in the plate. Supports that are less than 6 hours away from at least one edge of the board are considered edge or corner supports. For this, the round cut is to be carried out in accordance with DIN 1045-1, Figure 41, with a margin of 6 h (instead of 3 d according to Figure 41). If a round cut guide according to DIN 1045-1, picture 39, results in a smaller round cut length, this is decisive.

β Load increase factor for horizontally non-displaceably mounted ceiling systems according to DIN 1045-1, Fig. 44 or according to No. 525 of the DAfStb, Section 10.5.3.

wobei
α_Blech der Faktor zur Berücksichtigung der Tragfähigkeitserhöhung durch die Bleche ist. Blechdicke t [mm] Bewehrung ds Max. Anzahl der Bügel α_Blech GM-L5/12 5 12 2 2,0 GM-L5/10 5 10 1 1,7 GM-L3/12 3 12 1 1,7 GM-L3/10 3 10 1 1,5 V _Ed the design values of the actions acting on the component $${\mathrm{V}}_{\mathrm{Rd}.\mathrm{Max}}={\mathrm{\alpha }}_{\mathrm{sheet}}\cdot {\mathrm{V}}_{\mathrm{Rd}.\mathrm{ct}}$$

in which
α _{sheet is} the factor for taking into account the increase in load capacity by the sheets. Sheet thickness t [mm] Reinforcement ds Max. Number of hangers α _{sheet metal} GM-L5 / 12 5 12 2 2.0 GM-L5 / 10 5 10 1 1.7 GM-L3 / 12 3 12 1 1.7 GM-L3 / 10 3 10 1 1.5

• Im kritischen Rundschnitt beträgt die Querkrafttragfähigkeit V_Rd,ct der Platte zur Ermittlung der maximalen Tragfähigkeit: $$V_{\mathit{Rd},\mathit{ct}}=\left[0,14\cdot \kappa \cdot {\left(100\cdot {\rho }_l\cdot f_{\mathit{ck}}\right)}^{\frac{1}{3}}\right]\cdot d$$
  

  κ

  der Maßstabsfaktor nach Gleichung (106) in DIN 1045-1,

  ρ_l

  mittlerer Längsbewehrungsgrad innerhalb des betrachteten Rundschnitts

  d

  statische Bauteilhöhe

V _{Rd, ct} is determined as follows for interior, edge and corner columns:

• In the critical round section, the lateral force carrying capacity V _{Rd, ct of} the plate for determining the maximum load capacity is: $$V_{\mathit{Rd}.\mathit{ct}}=\left[0.14\cdot \kappa \cdot {\left(100\cdot {\rho }_l\cdot f_{\mathit{ck}}\right)}^{\frac{1}{3}}\right]\cdot d$$
  

  κ

  the scale factor according to equation (106) in DIN 1045-1,

  ρ _l

  average longitudinal reinforcement within the considered round section

  d

  static component height

Furthermore, it is advantageous if the shear force reinforcement is formed from as many L-shaped sheet metal parts made of structural steel with brackets attached thereto that the equation β · V _Ed ≦ V _{Rd, sy, L is} satisfied.

β

nach DIN 1045-1, Bild 44 oder nach DAfStb Heft 525, Abschnitt 10.5.3

V_Rd,sy,L dem Durchstanzwiderstand der L-Bleche $${\mathrm{V}}_{\mathrm{Rd},\mathrm{sy},\mathrm{L}}=\mathrm{k}\mathrm{1}\cdot {\mathrm{v}}_{\mathrm{Rd},\mathrm{ct}}\cdot {\mathrm{u}}_{\mathrm{i}}+\mathrm{2}\cdot {\mathrm{n}}_{\mathrm{Bügel}}\cdot \mathrm{k}\mathrm{2}\cdot {\mathrm{As},}_{\mathrm{Bügel}}\cdot {\mathrm{f}}_{\mathrm{yd}}\cdot {\mathrm{n}}_{\mathrm{Bleche}}$$

k1 = 1,70 für den Rundschnitt im Abstand 0,5 d vom Stützenrand k1 = 1,35 für den Rundschnitt im Abstand 1,25 d vom Stützenrand k1 = 1,00 für Rundschnitte im Abstand ≥ 2,0 d vom Stützenrand ui Umfang des Rundschnitts im betrachteten Nachweisschnitt n_Bügel Anzahl der Bügel je Stahlblech (1 oder 2)
k2 Verbundbeiwert k2 = 0,8 für t = 5 mm und 2 Ø 12 mm k2 = 0,7 für t = 5 mm und 2 Ø 10 mm und für t = 3 mm und 2 Ø 12 mm k2 = 0,5 für t = 3 mm und 2 Ø 10 mm

As,_Bügel

Querschnittsfläche eines Bügelschenkels

f_yd

Bemessungswert der Bügelspannung

n_Bleche

Anzahl der Stahlbleche im betrachteten Rundschnitt

Where:

β

according to DIN 1045-1, picture 44 or DAfStb booklet 525, section 10.5.3

V _{Rd, sy, L} the punching resistance of the L sheets $${\mathrm{V}}_{\mathrm{Rd}.\mathrm{sy}.\mathrm{L}}=\mathrm{k}\mathrm{1}\cdot {\mathrm{v}}_{\mathrm{Rd}.\mathrm{ct}}\cdot {\mathrm{u}}_{\mathrm{i}}+\mathrm{2}\cdot {\mathrm{n}}_{\mathrm{hanger}}\cdot \mathrm{k}\mathrm{2}\cdot {\mathrm{ace}.}_{\mathrm{hanger}}\cdot {\mathrm{f}}_{\mathrm{yd}}\cdot {\mathrm{n}}_{\mathrm{sheets}}$$

k1 = 1.70 for the round cut at a distance of 0.5 d from the support edge k1 = 1.35 for the round cut at a distance of 1.25 d from the support edge k1 = 1.00 for round cuts at a distance of ≥ 2.0 d from the support edge ui Scope of the round section in the relevant evidence section n _Bracket Number of brackets per steel sheet (1 or 2)
k2 compound coefficient k2 = 0.8 for t = 5 mm and 2 Ø 12 mm k2 = 0.7 for t = 5 mm and 2 Ø 10 mm and for t = 3 mm and 2 Ø 12 mm k2 = 0.5 for t = 3 mm and 2 Ø 10 mm

As, _strap

Cross-sectional area of a stirrup leg

f _yd

Rated value of the strap tension

n _sheets

Number of steel sheets in the considered round section

A thus configured reinforced concrete component has a greater punching performance than all comparable known solutions in the prior art.

• Der Abstand eines Blechs zum vorherigen oder nächsten Rundschnitt darf 0,75 d nicht überschreiten.
• Der kleinste Abstand zweier Bleche darf 3 cm nicht unterschreiten.

Furthermore, it is advantageous if the distances of the plates in the direction of the loaded surface (support) outgoing radii sr (radial direction) do not exceed the following values:

• The distance of one sheet to the previous or next round cut shall not exceed 0.75 d.
• The smallest distance between two sheets must not be less than 3 cm.

i

Nummer des Rundschnitts

d

statische Bauteilhöhe

In addition, the distances between the sheets in the direction of the course of the round sections s _t (tangential direction) are advantageously within the following values: $${\mathrm{s}}_{\mathrm{t}}\le \mathrm{0}.\mathrm{75}\times \mathrm{d}\times \mathrm{0}.\mathrm{8th}\times \mathrm{i}\le \mathrm{3}.\mathrm{5}\times \mathrm{d}$$

i

Number of the round section

d

static component height

Thus, according to the invention, the largest load capacities are achieved.

In a method according to the invention for producing a reinforced concrete component, it is provided that first the L-shaped sheet-metal parts are threaded onto the lowest layer of the longitudinal evaluation. The sheet metal parts are then upwards, since they form-fit the recess of the longitudinal reinforcement and prevent tipping over. The sheet metal parts protrude beyond the lower longitudinal reinforcement layer, but do not yet touch the area of the upper longitudinal reinforcement layer. Subsequently, the brackets are hung in the longitudinal recess of the sheet metal parts and lie with their shoulders on the uppermost layer of the longitudinal reinforcement. Then the reinforcement is poured in a batch with concrete. After hardening of the concrete, the reinforced concrete component is finished and loadable.

Particularly advantageous is the casting in two steps. It can be cast with the sheet metal parts, for example, after threading the sheet metal parts on the lowest longitudinal reinforcement, the lower longitudinal reinforcement. This can be done in a precast plant. After curing, these plates so produced can be transported to the site. Here, the installation of the upper longitudinal reinforcement layer and the hanging of the bracket in the recesses of the sheet metal part takes place. Then the upper reinforcement layer is backfilled until the desired ceiling thickness is reached. After the concrete has hardened, the reinforced concrete component according to the invention is ready.

Particularly advantageously, the bracket are locked in the recesses before the complete casting with concrete, so that during the concreting no changes in position of the bracket can be done relative to the sheet metal part.

Fig. 1

Ausschnitt eines erfindungsgemäßen Stahlbetonbauteils

Fig. 2a

L-förmiges Blechteil in Seitenansicht

Fig. 2b

L-förmiges Blechteil in Aufsicht ohne eingesetzten Bügel

Fig. 2c

L-förmiges Blechteil mit eingesetztem Bügel in Frontansicht

Fig. 3a

L-förmiges Blechteil mit eingesetztem Bügel in Seitenansicht

Fig. 3b

L-förmiges Blechteil mit zwei eingesetzten Bügeln in Seitenansicht

Fig. 4

Bewehrungsanordnung eines erfindungsgemäßen Stahlbetonbauteils

Further features, details and advantages of the invention will become apparent from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. Show it:

Fig. 1

Section of a reinforced concrete component according to the invention

Fig. 2a

L-shaped sheet metal part in side view

Fig. 2b

L-shaped sheet metal part in supervision without inserted bracket

Fig. 2c

L-shaped sheet metal part with inserted bracket in front view

Fig. 3a

L-shaped sheet metal part with inserted bracket in side view

Fig. 3b

L-shaped sheet metal part with two inserted brackets in side view

Fig. 4

Reinforcement arrangement of a reinforced concrete component according to the invention

FIG. 1 shows a section of a reinforced concrete component 10 with at least one upper Längsbewehrungslage Bo and at least one lower longitudinal reinforcement layer Bu, and a transverse force reinforcement Q, which is guided in its extension L on the uppermost longitudinal reinforcement Boo and the lowermost longitudinal reinforcement Buu, wherein the transverse force reinforcement Q of free-falling sheet metal parts 20 is formed with attached ironing 30. In this case, each sheet metal part 20 has a fold 40. The fold 40 is arranged on the side facing away from the bracket 20 of the sheet metal part. Each sheet metal part 20 preferably has a thickness of 3 or 5 mm. The reinforced concrete component thickness h runs over the entire cross section. The upper concrete cover c _o is formed from the upper end of the component to the beginning of the bracket 30, the lower concrete cover c _u extends from the end of the sheet 20 to the lower end of the component.

In addition shows FIG. 1 in that the sheet-metal parts 20 are arranged parallel to one another. The brackets 30 are suspended in a longitudinal recess 22 of the sheet metal part 20. The clip plate part 24 ensures the secure attachment of the bracket 30 in the longitudinal recess 22 of the sheet metal part 20. The clip plate part 24 acts as a detent which prevents accidental slipping out of the bracket 30 from the longitudinal recess 22 of the sheet metal part 20.

The bracket 30 are with their side facing away from the sheet metal part 20 on an approximately rectangular bend formed on the uppermost layer Boo the longitudinal movement Bo. According to the invention, the bracket 30 are also formed approximately T-shaped and are produced by a bending technique.

FIG. 2a shows a sheet metal part 20 with a longitudinal recess 22 and a clip sheet metal part 24 attached thereto. In the lower region of the sheet metal part 20, a bent portion 40 is formed. The fold 40 is followed by circular recesses 50.

FIG. 2b shows a sheet metal part 20, where 40 recesses 52 are arranged in the fold, which significantly increase the composite of the sheet metal part 20 in the concrete.

Figure 2c shows an L-shaped sheet metal part 20 with inserted bracket 30 in front view, before pouring concrete. The sheet metal part 20 is guided over the lowermost Längsbewehrungslage Buu, wherein the fold 40 engages around the lower longitudinal reinforcement rod S. Each two longitudinal reinforcing rods S are passed through the recesses 50 and thus ensure a secure bond between the sheet metal part 20 and lower longitudinal reinforcement layer Buu. The clip plate part 24 holds the bracket 30 in the longitudinal recess 22 of the sheet metal part 20. The bracket 30 has two shoulders 32 which rest on the uppermost layer Boo the upper longitudinal reinforcement Bo.

FIG. 3a shows the same installation situation as Figure 2c , but in the side view. The bracket 30 is arbitrarily installable with respect to an angle α to the vertical axis. As a result, a complex alignment of the bracket 30 relative to the sheet metal part 20 is unnecessary.

The bracket 30 is held in the longitudinal recess 22 by the clip plate part 24 in a mounting region BF. In addition shows FIG. 3a in that the lowermost reinforcement layer Buu of the longitudinal reinforcement Bu is guided through the recesses 50. The fold 40 is advantageously arranged near the recesses 50. The sheet metal part 20 and the bracket 30 thus form the transverse force reinforcement Q according to the invention for a reinforced concrete component 10 according to the invention.

FIG. 3b shows by way of example that two brackets 30 per sheet metal part 20 can be used. Here, both brackets 30 are held securely in position in a fastening region BF by the clip sheet metal part 24. The respective shoulders 32 rest on the uppermost longitudinal reinforcement layer Boo. The bracket 30 thus form in conjunction with the sheet metal part 20, the transverse force reinforcement Q.

FIG. 4 shows a reinforcement assembly BA using at least 20 L-shaped, free-form produced sheet metal parts 20 of structural steel with attached bracket 30. It can be seen that the sheet metal parts 20 are arranged concentrically around a core region K. The sheet metal parts 20 are doing with one or two brackets 30 in correspondence and thus form in their commonality the transverse force reinforcement Q.

The invention is not limited to any of the prescribed embodiments, but can be modified in many ways.

All of the claims, the description and the drawings resulting features and advantages, including design details, spatial arrangements and method steps may be essential to the invention both in itself and in various combinations.

LIST OF REFERENCE NUMBERS

BA

reinforcement arrangement

BF

fastening area

K

core area

Bu

lower longitudinal reinforcement layer

Buu

lowest longitudinal reinforcement layer

Bo

upper longitudinal reinforcement layer

Boo

top longitudinal reinforcement layer

L

expansion

S

rebar

Q

Shear reinforcement layer

H

component thickness

H _B

Temple length

10

Reinforced concrete component

20

sheet metal parts

22

longitudinal recess

24

Clip sheet metal part

30

hanger

32

shoulder

40

fold

50

recesses

52

recesses

Claims (20)

1. Reinforced concrete component (10) comprising at least an upper (Bo) and at least a lower (Bu) longitudinal reinforcement layer and a shear force reinforcement (Q), wherein it is guided in its expansion (L) beyond the most upper (Boo) and the lowest (Buu) longitudinal reinforcement, wherein the shear force reinforcement (Q) is manufactured from at least 20 L-shaped sheet metal parts (20) of structural steel, characterized in that brackets (30) are attached on the L-shaped metal parts (20), wherein each bracket (30) is mounted in a longitudinal recess (22) opened on one side of the L-shaped sheet metal part (20), wherein each bracket (30) is formed from a reinforcing bar of structural steel with round cross section, and wherein shoulders (32) of the brackets (30) are placed on the most upper longitudinal reinforcement layer (Boo).
2. Reinforced concrete component (10) according to claim 1, characterized in that each sheet metal part (20) has an edge (40).
3. Reinforced concrete component (10) according to claim 2, characterised by the fact that the edge (40) is arranged on the averted side of the bracket of the sheet metal part (20).
4. Reinforced concrete component (10) according to one of the claims of 2 or 3, characterised by the fact that two circular recesses (50) are formed on the edge (40) on each sheet metal part (20).
5. Reinforced concrete component (10) according to claim 4, characterized in that a longitudinal reinforcing bar (S) is guided through each recess (50).
6. Reinforced concrete component (10) according to claim 4 or 5, characterized in that the edges (40) are formed with additional notches (52).
7. Reinforced concrete component (10) according to one of the preceding claims, characterized in that each sheet metal part (20) has a thickness of 3 mm or 5 mm.
8. Reinforced concrete component (10) according to one of the preceding claims, characterized in that the sheet metal parts (20) are evenly arranged around an area (BA).
9. Reinforced concrete component (10) according to one of the preceding claims, characterized in that the sheet metal parts (20) are arranged parallel to each other.
10. Reinforced concrete component (10) according to one of the preceding claims, characterized in that the longitudinal recess (22) has a means for securing the position of the bracket (30).
11. Reinforced concrete component (10) according to claim 10, characterized in that the means for securing the position is formed as detent.
12. Reinforced concrete component (10) according to claim 10, characterized in that the detent is formed as a clip sheet metal part (24).
13. Reinforced concrete component (10) according to one of the preceding claims, characterized in that two brackets (30) are mounted to each sheet metal part (20).
14. Reinforced concrete component (10) according to one of the preceding claims, characterized in that the brackets (30) are made of structural steel with a diameter of 6 mm.
15. Reinforced concrete component (10) according to one of the preceding claims, characterized in that the brackets (30) are mounted as pivoted in an angle (α) relatively to the respective sheet metal part (20) up to a maximum of 45 degrees.
16. Reinforced concrete component (10) according to one of the preceding claims, characterized in that the bracket length (H_B) at a component thickness (h) smaller than 24 cm amounts to the value of the equation $${\mathrm{H}}_{\mathrm{B}}=\left(\mathrm{h}-{\mathrm{c}}_{\mathrm{o}}-{\mathrm{c}}_{\mathrm{u}}-\mathrm{7.5}\right)*\mathrm{1.06.}$$

    
17. Reinforced concrete component (10) according to one of the preceding claims, characterized in that the bracket length (H_B) at a component thickness (h) larger than or equal to 24 cm amounts to the value of the equation $${\mathrm{H}}_{\mathrm{B}}=\mathrm{h}-{\mathrm{c}}_{\mathrm{o}}-{\mathrm{c}}_{\mathrm{u}}-\mathrm{6.5.}$$

    
18. Method of making a reinforced concrete component (10) in accordance with the invention of claim 1 comprising the following steps:

    • Threading the L-shaped sheet metal parts (20) onto the lowest layer of the longitudinal reinforcement (Buu)

    • Mounting the brackets (30) into recesses (22) of the sheet metal parts (20), wherein the shoulders (32) of the brackets (30) are placed on the most upper layer of the longitudinal reinforcement (Boo)

    • Sealing with concrete
19. Method according to claim 18, characterised by the fact that the brackets (30) are locked into the recesses (22) of the sheet metal parts before the complete sealing with concrete.
20. Method according to claim 18 or 19, characterised by the fact that the sealing with concrete is made in two steps.

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