DE29809600U1 - Dowels for stone slabs arranged on concrete molds - Google Patents

Description

Dowels for stone slabs arranged on concrete forms

The present invention relates to a dowel for stone slabs arranged on concrete forms, in particular stair steps, landings or the like, for connecting railings, parapet bars or the like.

STATE OF THE ART

In the case of prefabricated concrete stairs, which are prefabricated in the factory, stone slabs are placed on top of the concrete staircase for cladding purposes. To connect the railing rods, these must be drilled through in order to insert dowels and enable the railing rods to be connected. This involves a considerable amount of manual work. Connecting the railing rods to the side walls of the concrete staircase also requires a relatively large amount of manual work.

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DESCRIPTION OF THE INVENTION

The present invention is based on the task or the technical problem of specifying a dowel for stone slabs applied to concrete molded parts, in particular staircases, landings or the like, which enables an economical production of such composite components, significantly reduces the manual connection work of railing bars or the like to be carried out during assembly and enables a permanent and reliable connection option for railing bars as part of a quick and easy assembly of prefabricated concrete stairs on site.

KENN-5IgDE

27 May 1998 .·'..". .".I*" .··..'·

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The dowel according to the invention is given by the features of the independent claim 1. Advantageous embodiments and further developments are the subject of the dependent claims.

The dowel according to the invention of the type mentioned at the beginning is characterized by a cylindrical base body with a blind hole recess/bore with internal thread, at least two circumferential grooves spaced apart from one another and formed on the outer circumference in the longitudinal axis direction of the base body and an O-ring arranged in each groove.

In a preferred embodiment, the O-rings are made of elastic material.

According to a preferred embodiment, sufficient rigidity and stability of the connecting structure can be achieved by the length of the cylindrical base body being in the range between 3 and 4 cm (centimeters), whereby the cylindrical base body is in particular still present within the thickness of the stone slab.

In order to ensure secure anchoring against twisting in the concrete beneath the stone slab, a particularly advantageous design is characterized by the fact that a projection unit is formed on the front side of the cylindrical base body opposite the opening of the blind hole.

0 The risk of pulling out when screwing in threaded rods for railing rods is prevented according to a particularly advantageous development by the fact that a protruding collar unit is formed on the front side of the cylindrical base body opposite the opening of the blind hole, whereby this collar unit lies flat against the

bottom of the stone slab. _3_

KENN-5IgDE

27 May 1998 ."..". .". I«·· .··..··

With the dowel according to the invention, it is possible to produce a prefabricated concrete staircase with attached stone slab elements in terms of the later connection options for railing rods on the construction site economically and as part of industrial prefabrication with high precision and long-term reliable function. In particular in conjunction with height-adjustable railing rods and handrails that can be connected spatially at any angle, an extremely inexpensive quick assembly of the staircase with railing can be easily implemented.

Further embodiments and advantages of the invention result from the features further listed in the claims and from the exemplary embodiment given below. The features of the claims can be combined with one another in any way, provided they do not obviously exclude one another.

0 SHORT DESCRIPTION OF THE DRAWING

The invention and advantageous embodiments and further developments of the same are described and explained in more detail below using the example shown in the drawing. The features shown in the description and the drawing can be used individually or in groups in any combination according to the invention. They show:

Fig. 1 schematic detailed section through the connection area of a threaded rod of a railing rod (not shown) connected via a dowel to a concrete component with an attached stone slab,

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KENN-5IgDE

27 May 1998 .··..". .". &Ggr;** "·*

Fig. 2 schematic side view of the anchor according to Fig. 1,

Fig. 3 schematic section through the dowel according to Fig.

at the level of a groove and
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Fig. 4 schematic bottom view of the anchor according to Fig.

WAYS TO CARRY OUT THE INVENTION

In the detailed section in Fig. 1, a concrete molded part 12 is shown schematically, on which a natural stone slab is arranged on the top. This is a concrete staircase with a natural stone step covering on the top. The natural stone slab 14 has a through hole 36. In this hole 36, which has a diameter D, a dowel 10 is inserted from below, which has a cylindrical base body 20, the diameter of which is slightly smaller than the diameter D of the hole 36.

The base body 20 extends over the entire thickness of the natural stone slab 14. On the underside, i.e. on the front end area facing the concrete molded part 12, a collar unit 34 is molded onto the base body 20, which has a larger diameter than the diameter D of the bore 36 of the natural stone slab 14. Furthermore, a projection unit 32 is molded onto the center of this collar unit 34, projecting downwards, which has a cuboid-shaped outer contour. The collar unit 34 has an essentially square outer peripheral contour when viewed from a 0 view (see Fig. 4).

On the top side of the base body 20 there is a blind hole 22 which is open at the top and has an internal thread 24. In the longitudinal axis direction 26 of the cylindrical

KENN-5IgDE

Two grooves 28 are formed on the base body 20 at a distance from one another on the outside, in each of which an O-ring 30 is inserted.

Both the collar unit 34 and the projection unit 32 are positively connected to the concrete 12 or are embedded in it.

A threaded rod 16 is screwed into the blind hole 22 from above - as shown schematically in Fig. 1 - to which, for example, a railing rod can be easily screwed.

With the dowel 10 shown, an economical production of prefabricated concrete stairs with attached natural stone slabs 14 can be easily implemented while ensuring a simple, precise and permanently reliable connection of railing rods. During production in the factory, the holes 3 6 for the dowels 10 are first made in the stone slab 14. The natural stone slab 14 or the step covering serves as the formwork on the underside. The dowels 10 are then pushed into the hole 3 6 until the protruding collar unit 34 hits the underside (the top side during the manufacturing process) of the natural stone slab 14. After the underside of the natural stone slab 14 has been treated with special adhesives, the concrete 12 is then applied to produce the flight of stairs. Such a precast concrete staircase already contains all the connections for railings, parapet bars or the like to be connected on site, so that there is no need for complex manual work on site to create the holes for the bar connections.

Claims (1)

KENN-51gDE .·*..". .".I"* .··..·* 27 May 1998 .* .** - * *· -1-CLAIMS 01) Dowel (10) for stone slabs arranged on concrete forms, in particular steps, landings or the like, for connecting railings, parapet bars or the like, characterized by - a cylindrical base body (20) with a blind hole recess/bore (22) with an internal thread (24), - at least two circumferential grooves (28) spaced apart from one another and formed on the outer circumference in the longitudinal axis direction (26) of the base body (20) and - an O-ring (30) arranged in a groove (28). 02) Dowel according to claim 1, characterized in that the O-rings (30) consist of elastic material. 03) Dowel according to claim 1 and/or 2, characterized in that the length of the base body (20) in the longitudinal axis direction (26) is in the range between 3 and 4 cm (centimeters). 04) Dowel according to one or more of the preceding claims, characterized in that a projection unit (32) is formed on the end face of the cylindrical base body (20) opposite the opening of the blind hole (22). KENN-51gDE 27 May 1998 * · *··* &idigr;&idigr;&iacgr;.·&Igr; J*., 05) Dowel according to one or more of the preceding claims, characterized in that a protruding collar unit (34) is formed on the end face of the cylindrical base body (20) opposite the opening of the blind hole (22). 06) Dowel according to claim 4 and/or 5, characterized in that the cross-sectional outer contour of the projection unit (32) and/or the collar unit (34) has a substantially square shape. 07) Dowel according to one or more of the preceding claims, characterized in that the length of the cylindrical base body (20) essentially corresponds to the thickness of the stone plate (14) or is slightly smaller than the thickness of the stone plate (14). 08) Concrete staircase, in particular prefabricated concrete staircase, with a concrete flight of stairs and stone slabs arranged on top, with railings, parapet bars or the like attached to the stone slabs, characterized in that the stone slabs have holes (36) in which a dowel (10) according to one or more of the preceding claims is arranged.