DE102015001222A1 - Spacers for a reinforcement in reinforced concrete construction - Google Patents

Abstract

The invention relates to a spacer for a reinforcement in reinforced concrete construction, wherein the spacer has an angled support structure. The invention has for its object to overcome the disadvantages of the prior art and to develop a spacer, which has stable contact surfaces, is used variably and enters into a very good connection with the surrounding concrete. This is inventively achieved in that the spacer has an angularly open honeycomb structure, wherein the honeycomb laterally fixed by two continuous connecting webs and mutually reversed in orientation between the connecting webs and the honeycomb webs are arranged and the supporting structure as a one-legged web angled - the honeycomb structure alternately following - is trained.

Description

The invention relates to a spacer for a reinforcement in reinforced concrete construction, wherein the spacer has an angled support structure.

For reinforced concrete structures, a specific concrete layer thickness to be maintained between a formwork and the reinforcement (structural steel) is prescribed as so-called concrete cover.

Even from a static point of view, the exact adherence to the concrete cover is essential, which has an effect on the stability and safety of the structure, the service life and, of course, the economic efficiency.

Compliance with this requirement often presents difficulties in practice. The previously available on the market spacers meet the legal requirements only partially or only under certain conditions and only in appropriate execution.

From the DE 298 03 433 U1 a spacer for reinforced concrete construction is known, which is designed as an angle rail with closed squares. It can only be used edgewise and does not allow the surrounding concrete to penetrate, so it acts as an additional joint. It has a low stability and can not be used variably in different mounting positions.

The EP 0 353 560 A1 describes a spacer for concrete reinforcements, which consists of a cement-bonded material and having a base body and a triangular support member. The concrete wedge can only be installed in one installation position, is expensive and heavy.

A spacer with truss structure is used in the US 2003/0009978 A1 described. Its installation would entail the creation of a continuous joint in the concrete body, which would be detrimental to the stability of the concrete.

From the EP 2 295 668 A1 is a spacer for reinforcement in reinforced concrete construction is known, which has a support structure in a vertical lattice construction or X-shaped expression on which a T-shaped support portion is arranged, which supports a strut via a connecting element at 90 ° angle, on which the reinforcement to Lying comes.

This construction can only be installed in one installation direction, has no bends and also creates a continuous joint in the concrete. In addition, it has a complicated structure and is unwieldy to handle.

The DE 195 33 239 A1 describes a spacer for laying reinforcing bars / mats with feet alternately offset on either side of a longitudinal centerline. The feet are designed as continuous elbows; the headband arranged on both sides along the center line stabilizes this spacer, which can only be installed in an installed position.

From the DE 90 13 975 U1 is a strip-shaped concrete spacers known, which also has a central longitudinal band, are arranged around the angled in different mutual embodiments support legs as a support structure. The support feet have uprights on their bends, however, are designed in the upper part as a continuous support structure, so that the concrete finds little to no penetration, here too, resulting in a lack of teeth and a predominantly continuous joint in the concrete.

The central longitudinal band insufficiently stabilizes the spacer. It can only be installed in a mounting position.

Also known is a spacer made of fiber concrete in a serpentine T-type ( DE 86 21 416 U1 ).

The DE 7 047 141 A1 describes a serpentine angled spacer having recesses for the bars of a reinforcing mat.

A spacer in the form of a bar with oblique support elements describes the DE 44 16 648 A1 ,

Finally, describe the DE 34 32 346 A1 and the EP 0 341 346 A2 two spacers, which are constructed in a U-shaped box structure and rest with their open side on the ground. They create a double joint in the concrete.

• • sie vorzugsweise nur in einer Einbaurichtung verwendet werden können, also nicht variabel einsetzbar sind,
• • keine ausreichende Anpassung an sich verändernde Gegebenheiten möglich ist,
• • eine Fuge in den Beton gebildet wird,
• • keine ausreichende Verzahnung/Verbund mit dem Beton stattfindet,
• • hohe Herstell- und Materialkosten vorhanden sind,
• • unzureichende Befestigungsmöglichkeiten des Abstandshalters mit der Bewehrung vorhanden sind,
• • die Standsicherheit oftmals unzureichend ausgeprägt ist,
• • die Verarbeitung auf der Baustelle umständlich ist.

All known spacers have in common that

• They can preferably be used only in one direction of installation, that is, they can not be used variably,
• • insufficient adaptation to changing circumstances is possible,
• • a joint is formed in the concrete,
• • there is insufficient interlocking / bonding with the concrete,
• High production and material costs are present
• • there are insufficient fixing possibilities of the spacer with the reinforcement,
• • the stability is often inadequate,
• • the processing on site is cumbersome.

The invention has for its object to overcome the disadvantages of the prior art and to develop a spacer, which has stable contact surfaces, is used variably and enters into a very good connection with the surrounding concrete.

This is inventively achieved in that
the spacer having an angularly open honeycomb structure, wherein the honeycomb fixed laterally by two continuous connecting webs and mutually reversed in orientation between the connecting webs and the honeycomb webs are arranged and the support structure angled as a one-legged web - the honeycomb structure mutually following - is formed.

The connecting webs, as well as the support structure have a plurality of passage openings with different diameters. As a result, even at different grain sizes of the concrete aggregate at all points an optimal connection with the spacer can be achieved without a continuous concrete (separating) fugue is achieved.

The honeycomb structure between the connecting webs is formed with large openings prism-shaped or trapezoidal or triangular, resulting in increased stability.

The distance between the connecting webs is greater than the distance between the connecting webs and the support structure is formed (wider than high).

The spacer can be variably installed in all four installation directions by simply turning 90 ° in the reinforced concrete surfaces (also in wall formwork). When laying on the connecting webs lying (support structure pointing upwards), the spacer can also be placed on thicker construction films or on relatively freshly concreted - already sufficiently stable - substrates or layers without being pressed in or pushed.

The spacer can also be used on soft substrates (eg insulations). In these cases, it is merely inverted (base plate down) installed.

It may have a rough and / or a structured and / or porous and / or a brittle surface texture, which leads to a better connection to the concrete.

The material used for the spacer may preferably be a plastic or a plastic compound (with or without additives or compounds). It is also conceivable to use a polymer concrete or other materials which have similar material properties.

On the connecting webs, it is possible to set up preferably one or more strips in its edge regions. These serve to achieve a minimum contact between spacers and reinforcement for special requirements.

Advantages of the invention:

• - very variable use in all four installation positions possible by simply turning,
• - can also be used in wall formwork,
• Great stability in itself due to two continuous connecting webs in connection with a special angular, mutually open honeycomb structure,
• Angular, the support structure following web guide supports non-tilting and is statically advantageous for the construction,
• - additional safety due to special dimensioning (distance between the connecting webs greater than the distance between the connecting webs and the supporting structure),
• - very good anchoring of the spacer in the concrete by special arrangement of large and small openings for the concrete (also possible with larger grain sizes possible), increase the concrete contact surfaces,
• - very low material consumption due to lightweight construction,
• - easy and cheap to manufacture,
• Very good stability of the spacer even at low and high ambient temperatures,
• - easy, quick and easy to lay, thanks to the use of plastic,
• - also very well suited for the fixation of plastic heating circuits for underfloor heating,
• No formation of joints in the concrete, no line-shaped severing or weakening of the concrete in the area of the spacer,
• - Also usable as a direct support on the excavation floor, with or without installation of compensation or support layers, even on thick construction films without danger of crushing when the spacer is placed on the connecting webs with the support structure facing up,

embodiment

The invention will be explained below with reference to an embodiment.

Showing:

1 - The spacer in three-dimensional view

2 - The spacer in three-dimensional design with different openings

The spacer 1 has two connecting bridges 3 on, which run parallel to each other. The distance between the two connecting webs 3 depends on the size of the spacer 1 , Between the two connecting bridges 3 are mutually reversed, angular shaped, open honeycomb structures 2 arranged. The honeycomb structure 3 following, is located under the parallel led connecting webs 3 as well as the sloping honeycomb webs 6 a one-legged support structure 4 with passages 5 ,

The passage openings 5 can have different diameters / widths and be round or oval or angular (triangular or polygonal).

They serve for a better penetration of the spacer 1 with concrete, which can have different grain sizes of its aggregate.

LIST OF REFERENCE NUMBERS

1

spacer

2

honeycomb structure

3

connecting web

4

supporting structure

5

Through openings

6

honeycomb web

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 29803433 U1 [0005]
• EP 0353560 A1 [0006]
• US 2003/0009978 A1 [0007]
• EP 2295668 A1 [0008]
• DE 19533239 A1 [0010]
• DE 9013975 U1 [0011]
• DE 8621416 U1 [0013]
• DE 7047141 A1 [0014]
• DE 4416648 A1 [0015]
• DE 3432346 A1 [0016]
• EP 0341346 A2 [0016]

Claims (9)

Spacer for a reinforcement in reinforced concrete construction, the spacer having an angled support structure, characterized in that the spacer ( 1 ) an angularly open honeycomb structure ( 2 ), wherein the honeycomb laterally by two continuous connecting webs ( 3 ) and in their orientation mutually reversed between the connecting webs ( 3 ) and the honeycomb webs ( 6 ) are arranged and the support structure ( 4 ) angled as a one-legged web - the honeycomb structure following each other - is formed. Spacer according to claim 1, characterized in that both the connecting webs ( 3 ), as well as the supporting structure ( 4 ) a plurality of passages ( 5 ) having different diameters or shapes. Spacer according to claim 1, characterized in that the honeycomb structure ( 2 ) between the connecting webs ( 3 ) - is designed with large openings - prismatic or trapezoidal or triangular or otherwise shaped. Spacer according to claim 1, characterized in that the distance between the connecting webs ( 3 ) greater than the distance between the connecting webs ( 3 ) and the supporting structure ( 4 ) is trained. Spacer according to claim 1, characterized in that the spacer ( 1 ) can be installed variably in all four installation directions in the reinforced concrete surfaces. Spacer according to claim 1, characterized in that the spacer ( 1 ) has a structured and / or rough and / or a porous and / or a brittle surface finish. Spacer according to claim 1, characterized in that a plastic or a plastic compound (with or without additives or compounds) can be used as the material. Spacer according to claim 1, characterized in that on the connecting webs ( 3 ) is a bar can be placed. Spacer according to claim 1, characterized in that the one-legged bridge ( 4 ) in its bends each have one or more stiffener (s).

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