DE102010012537A1 - Reinforcing bar for connecting two wall shells of prefabricated wall in building, has tooth-shaped notches arranged at end region and evenly arranged in longitudinal direction, and elongated body tapered at end region - Google Patents

Abstract

The bar (1) has tooth-shaped notches (4) arranged at an end region (2), and an elongated body (6) tapered at the end region. The notches are evenly arranged in a distributed manner in a longitudinal direction at periphery of the bar, where flanks of the tooth-shaped notches run in an asymmetrical manner. The flanks of the notches include an angle of 90 degrees. One of the flanks forms a pointed angle with a central longitudinal axis of the flank, and the other flank forms a pointed angle with a central longitudinal axis of the bar. The bar is made of fiber-reinforced material or composite material.

Description

The The present invention relates to a reinforcing bar for Connection of at least two wall shells of a prefabricated part, which causes both a mechanical connection of two wall shells, as well as their distance determined.

From the DE 2 139 197 A1 it is known in buildings with lost formwork to provide two cast or sprayed formwork walls as permanent formwork and use a Baustahlgewebe in the cast shuttering walls so that the nodes are pressed into the still liquid plastic shuttering, so that the nodes of the reinforcing bars of Baustahlgewebes after the Curing of the plastic are completely enclosed. Structural steel mesh is difficult to handle and must be adapted to the individual requirements of the individual case, which complicates a rational production of finished parts and expensive.

Another solution for the manufacture of prefabricated construction is in the DE 2 305 651 A1 shown and described. There, too, the disadvantages of reinforcing iron deposits and of reinforcing steel mesh are discussed in detail, in particular, the cumbersome, expensive and time-consuming preparation and processing are listed in this document. In contrast, the production of cast-ready reinforced concrete should be facilitated by the invention described therein, that solidification, z. B. steel rods are added to the casting concrete in small and / or larger versions during casting. The steel rods should be specially shaped. As exemplary deformations there is specified that they should be so surface deformed that they continuously in the axial direction of their cross section in a smooth transition continuously from flat to square to round and turn to square too flat respectively about the axis - preferably 180 ° - and be repeatedly deformed, the material cross section remains approximately always in the same cross-sectional size. These continuously deformed rods are bent in their longitudinal axis so that each rod occupies a flat, spiral shape, wherein the rotation of this spiral is preferably about 1 1/2 revolutions, that is rotated by about 540 °. Understandably, the shape of the rods described by the drawings attached there. As advantages, a reduced rate of sinking in cast concrete due to the special shape are cited there. In addition, the contact with the outer surfaces of the finished part to be cast should be minimal, and due to the 540 ° twisting and bending a better bond with the cast concrete can be produced, which should provide the highest possible additional strength and elasticity with minimal use of steel. Further advantages are given in the description there.

Out However, this document is not apparent as the stability the prefabricated parts during pouring with in-situ concrete purposefully increased could be. Furthermore, it is not apparent that a higher concreting = concreting speed through the use of the rods described there come about could. In summary, the document is not apparent, how stabilization devices could be designed, which can be used in the production of multi-shell prefabricated parts are and how through use the production speed during pouring could be increased with in-situ concrete defined.

Under Concreting performance should be understood here that in the production of buildings with the help of prefabricated, disc-like prefabricated the Concreting speed is limited by the fact that from a certain Fill level with in-situ concrete between the disc-like Finished parts the further filling has to be stopped until the already filled Ortbetonmenge to a predetermined Degree is cured. Only then may further poured in-situ concrete become. The stability of the multi-shell finished parts would otherwise the casting pressure leading to bulges of the disc-like Finished parts leads, can not withstand.

Stabilizing devices which meet these requirements are known from US 5,439,237 US 5,673,525 known. There connecting rods are shown and described, which have a circular cross section and pointed ends. By rotationally symmetrical thickening and flattening in the end regions of the connecting rods shown there anchoring in the wall elements is effected. The connecting rods are made of plastic to reduce the thermal conductivity.

Such rebars are also from the DE 20 2006 019 894 U1 known. There, a reinforcing bar and the production of a cavity wall is described. It is explained that first a concrete layer is poured into a mold, that on this not yet hardened concrete layer, a thermal barrier coating is applied, and then put through the thermal barrier coating reinforcing bars, which also penetrate the fresh concrete until it is at the bottom of the mold rest. After the setting of the first concrete layer, it is lifted out of the mold, turned and then lowered to a second fresh concrete layer while maintaining a certain distance. The rebars dip into the fresh concrete until they rest on the bottom of the second layer of concrete. The length of the Beweh In this case, the rods determines the thickness of the insulated hollow wall produced in this way. Although a number of embodiments are described in that document, reinforcing rods according to the embodiments described there have in practice no satisfactory properties for producing a cost-effective, but high-quality precast wall.

Of the The present invention is based on the object, the properties to improve such reinforcing bars and thus qualitatively to create higher-quality insulated wall elements, where at preferably also their production costs should be reduced.

These Task is performed by reinforcing bars with the characteristics of Claim 1 solved. Prefabricated components with the characteristics of Claim 15 also solve this problem. Through objects with the features of the dependent claims the invention even more advantageous.

The Advantages of the reinforcing bar according to the invention are mainly in terms of its positive characteristics the derivation of tensile and compressive forces in the finished Prefabricated wall, furthermore in the high tear-out strength, the low thermal conductivity and also in the cost-effective manufacturability.

Advantageous is a reinforcing bar for connecting at least two wall shells a prefabricated part, if he has both a mechanical connection causes two wall shells, wherein the reinforcing rod by a elongated body is formed, at least tapered at one end, and when at least one end portion sawtooth-shaped Has notches.

Especially It is advantageous if the sawtooth Notches distributed evenly around the circumference are, or if the sawtooth notches on Circumference are arranged diametrically opposite, in particular, if the serrated notches are diametrical on the perimeter opposite lying in unequal numbers are arranged.

It may also be advantageous if the sawtooth Notches in the longitudinal direction of the reinforcing bar offset on Scope are arranged.

About that In addition, a reinforcing rod is advantageously designed when the Flanks of the sawtooth notches unbalanced run, and if the flanks of the sawtooth Notches include an angle α, which deviates from 90 °.

Especially it is advantageous if the pointing to the end of the rebar Flank to its central longitudinal axis an acute angle α1 and the end of the leading edge of the sawtooth Score a 90 ° angle or an obtuse angle α2 to the central longitudinal axis of the reinforcing bar.

Further a reinforcing bar is advantageous when passing through an elongated Body is formed by largely constant cross section, the Saw-toothed notches at its end regions having.

One Rebar can also be designed advantageous if he by an elongated body of largely constant Cross-section is formed, the at least one end of a cap having sawtooth notches.

Advantageous may be executed a reinforcing bar whose cross-section circular, oval, prismatic or triangular is.

With Help of embodiments, the invention below will be explained in more detail with reference to the drawings.

It shows

1a to 1c a section of a reinforcing bar according to the invention in three views;

2a to 2c various embodiments of reinforcing bar sections;

3a to 3c various embodiments of a reinforcing bar;

4 a multi-shell semi-finished component for creating structures with two substantially parallel spaced wall shells and insulation;

5 a multi-shell wall element with insulation poured out with in-situ concrete;

6 a ventilated, in-situ concrete poured multi-walled wall element with insulation;

7 a sandwich wall with insulation;

8th a ventilated sandwich wall;

9 an in-situ concrete poured multi-wall element with insulation and stabilizing element;

10 a plan view of the wall element according to 9 ;

11 a sandwich wall with stabilizing element;

12 a plan view of the wall element according to 11 and

13a to 13c various basic cross-section variants of a rebar with the associated sub-variants.

The 1a to 1c show a section of a reinforcing bar 1 according to the invention in three views. 1a represents a front view of a section of a reinforcing bar 1 at the end region 2 a tip 3 as well as sawtooth notches 4 are located. Here are two notches 4 recognizable flat, the opposite single notch 4 is invisible in this view. The summit 3 is due to a bevel of the reinforcing bar 1 at its ends 2 created and creates an oblique end surface 5 at the respective end of one of an elongated body 6 formed rebar 1 , By an oblique end face 5 is the rebar 1 good to assemble because of the rebar 1 easily get stuck through an insulating layer, as in the following 5 et seq will be described later. The rebar 1 Due to the beveled tips 3/5 it is also possible to avoid obstacles which may be present in fresh concrete. Such obstacles may be formed by pebbles, other reinforcing elements or the like.

As in 1c illustrates the flanks of the notches 4 an angle deviating from 90 °. To the central longitudinal axis of the reinforcing bar 1 close those to the top 3 of the reinforcing bar 1 pointing flanks each an acute angle α1. The one from the top 3 of the reinforcing bar 1 pointing away flanks close to the longitudinal center axis of the reinforcing bar 1 however, a 90 ° angle or an obtuse angle α2. Through the sloping flanks of the notches 4 enters a wedge effect, through which the pull-out forces in the longitudinal direction of the reinforcing bars 1 introduced in wall shells multi-walled walls and are absorbed by these. This will become the following 5 et seq described in more detail.

1b represents a rear view of a section of a rebar 1 a notch 4 is visible in a planar view, the two on the front of the reinforcing rod 1 arranged further notches 4 are illustrated by invisible edges. The sloping end surface 5 is recognizable in this view as an oval surface.

1c shows the rebar 1 opposite the view 1b turned by 90 degrees. All three notches 4 and the beveled end surface 5 are clearly visible in the profile.

In 2a becomes a section of a rebar 1 shown in the diametrically arranged and longitudinally offset notches 4 over a longer area of the elongated body 6 of the reinforcing bar 1 are present, as in the embodiment according to 1 ,

2 B illustrates an embodiment in which over a longer range of a rebar 1 along a surface line a multitude of notches 4 are arranged.

In 2c is shown a section of another variant, in which on the elongated body 6 of the reinforcing bar 1 a cap 7 is arranged. The cap 7 carries notches 4 , analogous to the embodiments already described. The cap 7 must, of course, stuck with the elongated body 6 be connected. The cap 7 and the body 6 can consist of the same or different material.

One - not Expressed - additional Variation may be notches on the circumference of a rebar provide that more or less evenly across the circumference are distributed.

In 3 are three variants of a rebar 1 shown. 3a shows a homogeneous reinforcing bar 1 with an elongated body 6 and three notches each 4 at its end areas 2 , In 3b is a rebar 1 with an elongated body 6 shown at one end 2 the notches already explained 4 wears and on his other end area 23b differently shaped anchoring elements 24b , This embodiment is merely intended to illustrate that a reinforcing bar 1 Although preferred according to the invention at its end 2 notch 4 contributes, but that it is also possible in principle, at one end 23b differently shaped anchoring elements 24b provided. Out 3c is a rebar 1 with a one-sided attached cap 7 apparent light, the cap 7 again notches 4 having.

In 4 is a multi-shell wall element 8th standing upright as shown and described similarly already in the prior art. For a better understanding of the production method of such a wall element is still briefly described, including the 4 mentally should be rotated 90 ° counterclockwise. A first wall shell 9 is created by liquid concrete B is poured into a horizontally arranged shape, not shown. As long as the concrete B has not yet set, becomes an insulating layer 10 on the top of the concrete B up introduced. Reinforcing rods according to the invention 1 are then passed through the insulating layer 10 into the not yet set, fresh concrete B introduced. The reinforcing bars 1 pierce the insulating layer 10 , also penetrate the fresh concrete B and abut on the surface of the mold, not shown. The tips 3 the reinforcing bars 1 are therefore located at the separation point between the mold and the outside of the wall shell 9 , After setting or hardening of concrete B, the finished product - consisting of the first wall shell 9 , the insulating layer 10 and the rebars 1 - released from the mold, and turned.

In the same way, the second wall shell 11 cast in a mold, not shown. The turned first wall shell 9 with the insulating layer 10 and the free spikes now protruding downwards 3 the reinforcing bars 1 is placed in a position above the wall shell, which has just been poured with concrete B 11 and then into the still fresh concrete B of the second wall shell 11 lowered until the tips 3 the reinforcing bars 1 rest on the mold. The tips 3 are now at the separation point between the shape and the outside of the second wall shell 11 ,

Around the rebars 1 in the concrete B of the first and the second wall shell 9 and 11 to give sufficient support, assign the reinforcing bars 1 at their end areas 2 each a number of sawtooth notches 4 on. Through these sawtooth notches 4 is between the rebars 1 and the wall shells 9 and 11 created a form and adhesion, through which the reinforcing rods 1 in the wall shells 9 and 11 are securely anchored and the wall element 8th give the required strength.

At the site of the construction site, the spaces between the wall element 8th to be able to fill with in-situ concrete OB, the reinforcing bars must 1 can absorb the tensile forces that arise when fresh in-situ concrete OB in the interstices of the wall element 8th is filled. These forces depend on the height of the gap of the erected wall element 8th from, as with greater height of the internal pressure through the filled in-situ concrete OB increases. The tensile forces and the internal pressure increase as the height of the filled in-situ concrete OB increases. Without the reinforcing bars according to the invention 1 it would come when filling with in-situ concrete OB to harmful bulges. But also pressure forces are from the reinforcing bars according to the invention 1 added. Compressive forces occur when on the erected wall element 8th in the installed state, earth loads, water loads and / or wind forces act.

A cast with in-situ concrete OB wall element 8th is in 5 illustrated, wherein the same or equivalent elements are not again, or provided with the same reference numerals, as in 4 , To some extent, shear forces can also be due to the reinforcing bars 1 be recorded. Shearing forces occur mainly during storage and / or during transport of the semi-finished components. In order to increase the strength even further, in the wall element 8th additional support between the wall shells be anticipated, as later to the 10 to 13 will be described.

In 6 is another variant of a wall element 8th In this embodiment, there is a cavity 12 between the first wall shell 9 and the insulating layer 10 , causing a rear ventilation of the wall element 8th leads. Such ventilation is often required for air conditioning reasons. The required cavity 12 can by spacers, not shown in the manufacture of the first wall shell 9 be created. As is well known in the art, spacers on or above the not yet set concrete B of the first wall shell 9 positioned and only then is the insulating layer 10 introduced until it rests on spacers, not shown. This creates between the first wall shell 9 and the insulating layer 10 a space that defines the cavity 12 forms for ventilation. The filling of the gap between the insulating layer 10 and the second wall shell 11 with cast-in-situ concrete OB is carried out analogously to the description of the 5 , The reinforcing bars according to the invention 1 can be used with great advantage also in so-called ventilated walls.

In 7 is another variant of a wall element 8th represented, in which already in the manufacturing company, the complete wall element 8th is manufactured. At the construction site, such wall elements 8th then only assembled. The preparation is carried out in a similar manner as described above, but eliminates some steps. A first wall shell 9 is poured in a mold. On the not yet set concrete B is an insulating layer 10 applied and a number of reinforcing bars 1 is through the insulating layer 10 in the not yet set concrete B of the first wall shell 9 plugged. Subsequently, a second wall shell 11 in the required thickness on the insulating layer 10 poured and the wall element 8th can harden or set. The mechanical cohesion of the two wall shells 9 and 11 is essentially by the reinforcing bars 1 guaranteed. Such walls are referred to as sandwich walls.

In 8th is a sub-variant of a wall element 8th according to 7 shown. By not shown and therefore not designated spacers is in the according to the description to 7 wall element produced an air layer between the first wall shell 9 and the insulating layer created by a cavity 12 arises. Such wall elements 8th are referred to as ventilated sandwich walls. Even with such a wall structure, the reinforcing rods according to the invention can be 1 use with advantage.

In 9 is a lying wall element 8th shown, which is basically constructed, as the wall element 8th according to the 4 and 5 , In addition, this wall element features 8th however, via a stabilizing element 13 , The stabilizing element 13 is with its outer edges 14 in the wall shells 9 . 11 anchored. In the associated plan view according to 10 it can be seen that the stabilizing element 13 has a meandering cross-section Q. The stabilizing element 13 can with one or more reinforcing bars 1 be firmly or movably connected, the reinforcing rods 1 deeper in the wall shells 9 . 11 anchored as the outer edges 14 of the stabilizing element 13 , Additional single reinforcing bars 1 are in the wall element 8th arranged distributed according to the required strength. From the stabilizing element 13 can have multiple copies in the wall element 8th be arranged, because it serves to further improve the strength of the wall element 8th , in particular the improvement of the tensile shear and shear strength.

In 11 is again a lying wall element 8th shown, which is basically constructed, as the wall element 8th according to 7 , as a so-called sandwich wall. In addition, this wall element also has 8th - Similar to the embodiment according to 9 - via a stabilizing element 13 , The stabilizing element 13 is with its outer edges 14 in the wall shells 9 . 11 anchored. In the associated plan view according to 12 it can be seen that the stabilizing element 13 has a meandering cross-section Q. The stabilizing element 13 can with one or more reinforcing bars 1 be firmly or movably connected, the reinforcing rods 1 deeper in the wall elements 9 . 11 anchored as the outer edges 14 of the stabilizing element 13 , Additional single reinforcing bars 1 are in the wall element 8th arranged distributed according to the required strength. From the stabilizing element 13 can have multiple copies in the wall element 8th be arranged, because it serves to further improve the strength of the wall element 8th , in particular the improvement of the tensile shear and shear strength.

In 13 are different cross-sectional variants of a rebar 1 shown schematically, in 13a the circular cross section Q of a reinforcing bar 1 is shown while in 13b an oval cross section Q of a reinforcing bar 1 is illustrated. Another way shows 13c , which makes it clear that also a prismatic cross-section Q of the rebar 1 may be advantageous.

Variations of these basic cross-sectional embodiments are further advantageous modifications according to the 13 , The subvariants shown on the basic variants "circular", "oval" and "prismatic" speak for themselves and need not be further described, since they should show only some of the possibilities that are possible in an implementation of the invention anyway.

In a preferred embodiment, the reinforcing rod made of fiber reinforced material, in a variant is provided as a material composite material. Mixed forms are conceivable and permissible. To improve the properties, the rebar can 1 coated, this is referred to as coated or "coated". The rebar 1 This makes it smoother and more resistant to aggressive media.

Advantageously, a number of reinforcing bars can be 1 with the help of a holding strip magazine. The retaining strip is, for example, in a common plane with the reinforcing bars 1 , can be rolled up and produced in almost any length. This is the automated supply of rebars 1 possible in production, which has a cost-effective effect.

The wall element in the above description 8th designated component should always be understood in the sense of a prefabricated part, where it can be used as a wall element, ceiling element or floor element use.

1

rebar

2

end regions

3

sharpen

4

notch

5

end face

6

body

7

cap

8th

wall element

9

first wall shell

10

insulating

11

second wall shell

12

cavity

13

stabilizing element

14

outer edges

B

concrete

IF

situ concrete

Q

cross-section

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 2139197 A1 [0002]
• DE 2305651 A1 [0003]
• - US 5673525 [0006]
• - DE 202006019894 U1 [0007]

Claims (17)

Reinforcing bar ( 1 ) for connecting at least two wall shells ( 9 . 11 ) of a prefabricated part ( 8th ), a mechanical connection of two wall shells ( 9 . 11 ), the reinforcing bar ( 1 ) by an elongated body ( 6 ) formed at least at one end ( 2 ), characterized in that the reinforcing bar ( 1 ) at least to one end region ( 2 ) Sawtooth notches ( 4 ) having. Reinforcing bar according to claim 1, characterized in that the sawtooth-shaped notches ( 4 ) are evenly distributed around the circumference. Reinforcing bar according to claim 1, characterized in that the sawtooth-shaped notches ( 4 ) are arranged diametrically opposite to the circumference. Reinforcing bar according to claim 1, characterized in that the sawtooth-shaped notches ( 4 ) are arranged on the circumference diametrically opposite lying in unequal numbers. Reinforcing bar according to claim 1, characterized in that the sawtooth-shaped notches ( 4 ) in the longitudinal direction of the reinforcing bar ( 1 ) are arranged offset on the circumference. Reinforcing bar according to claim 1, characterized in that the flanks of the sawtooth-shaped notches ( 4 ) run asymmetrically. Reinforcing bar according to claim 1, characterized in that the flanks of the sawtooth-shaped notches ( 4 ) include an angle α that deviates from 90 °. Reinforcing bar according to claim 1, characterized in that the end ( 2 ) of the rebar ( 1 ) pointing edge to the central longitudinal axis of an acute angle α1 and the end facing away from the end edge of the sawtooth notch ( 4 ) a 90 ° angle or an obtuse angle α 2 to the central longitudinal axis of the reinforcing bar ( 1 ). Reinforcing bar according to claim 1, characterized in that it is constituted by an elongate body ( 6 ) of substantially constant cross section (Q) is formed, which at its end regions ( 2 ) Sawtooth notches ( 4 ) having. Reinforcing bar according to claim 1, characterized in that it is constituted by an elongate body ( 6 ) of substantially constant cross-section (Q) is formed on at least one end ( 2 ) a cap ( 7 ) with sawtooth notches ( 4 ) having. Reinforcing bar according to claim 1, characterized that its cross section (Q) is substantially circular, oval or is executed prismatic. Reinforcing bar according to claim 1, characterized that it consists of fiber reinforced material. Reinforcing bar according to claim 1, characterized that it consists of composite material. Reinforcing bar according to claim 1, characterized that its surface is coated. Prefabricated part with at least two wall shells, characterized in that for connecting the wall shells ( 9 . 11 ) at least reinforcing bars ( 1 ) are present according to one of the preceding claims. Prefabricated component according to claim 15, characterized in that at least one further stabilizing element ( 13 ) for connecting the wall shells ( 9 . 11 ) available. Prefabricated component according to claim 16, characterized in that the at least one further stabilizing element ( 13 ) between the ends ( 2 ) of reinforcing bars ( 1 ), wherein its the wall shells ( 9 . 11 ) facing outer edges ( 14 ) are anchored in these.