EP3967827A1 - Prefabricated concrete step - Google Patents

Abstract

Described is a precast concrete stair part T having a foundation section F and a step section S, wherein the foundation section F is designed and set up for anchoring the precast concrete stair part T in the subsoil. The foundation section F has a foundation section base area Fg intended to rest on the subsoil and a foundation section lateral surface. The step section S has a step section top surface Sd provided as a stepping surface, a step section base surface Sg opposite the step section top surface Sd, and a step section lateral surface. The step section S protrudes at least in a partial area of its step section lateral surface over the foundation section F in a partial area of its foundation section lateral surface. The precast concrete stair part T has elongate reinforcement elements A, wherein at least one of the elongate reinforcement elements A has a foundation reinforcement section FA arranged in the foundation section F and a step reinforcement section SA arranged in the step section S.

Description

technical field

The present invention relates to a precast concrete stair part.

State of the art

In the case of buildings on slopes, it is often necessary to equip sections of terrain with a slope outside the building with concrete stairs. The steps of such a concrete staircase are usually formed by producing individual foundation parts from in-situ concrete or by laying prefabricated foundation parts and then fastening tread plates to the foundation parts.

An attractive appearance can be achieved if the steps are laid in such a way that the tread plate arranged higher in the vertical direction protrudes over the tread plate arranged below. If the upper slab protrudes far enough from the lower slab, the foundation supporting the upper slab remains invisible to the viewer and the upper slab appears to float above the lower slab.

In addition, outdoor stairs are known, the steps of which are made of prefabricated concrete parts, with several steps often being connected to one another by bolts or screws to improve stability. So reveals the DE 76 10 754 U1 for example, a staircase whose steps are made of prefabricated concrete blocks. When assembling the stairs, the steps are arranged in relation to one another in such a way that, for each consecutive pair of blocks, the front part of the upper block rests on the rear part of the lower block. The pairs of blocks are each connected to one another by screw links.

the DE 92 11 796 U1 discloses a concrete block for forming stairs, walls and partitions. The concrete block consists of a lower slab and an upper slab, which are connected via a central web that determines the distance between the slabs, resulting in the shape of a double T-beam. A large number of such shaped concrete blocks can be arranged in such a way that they form a staircase.

A general disadvantage of the prior art solutions is the high cost of laying the individual elements. If the tread plates are fastened to the foundation parts on site, stresses often arise due to the different thermal expansion of the two elements. This causes the connection between the foundation and the tread plate to age, causing the tread plate to slowly loosen and begin to wobble.

There is therefore a need for outdoor concrete stairs that are simple and inexpensive to install while also having high environmental resistance.

Presentation of the invention

The object of the invention, as characterized in the claims, is to provide a concrete staircase for outdoor use that is easy and inexpensive to install and at the same time has a long service life without noticeable aging due to environmental influences.

This object is achieved according to the invention by the precast concrete stair part according to claim 1 . Further advantageous details, aspects and configurations of the present invention result from the dependent claims, the description, the examples and the drawings.

The present invention provides a precast concrete stair part having a foundation section and a step section, wherein the foundation section is designed and set up for anchoring the precast concrete stair part in the subsoil. The foundation section has a foundation section base area provided for resting on the subsoil and a foundation section outer surface. The step section has a step section top surface provided as a stepping surface, a step section base surface opposite the step section top surface and a step section lateral surface. The step section protrudes at least in a partial area of its step section lateral surface over the foundation section in a partial area of its foundation section lateral surface. The precast concrete stair part has elongate reinforcement elements, with at least one of the elongate reinforcement elements being arranged in the foundation section Having a foundation reinforcement section and a stepped reinforcement section arranged in the step section.

In contrast to the concrete stairs known from the prior art, in which foundation parts made of in-situ concrete or prefabricated foundation parts are placed in the subsoil and tread plates are then fastened to the foundation parts, the precast concrete stair part according to the invention is a one-piece precast concrete part. The aging of the connection between the foundation and the tread plate, which is known from the prior art, due to different thermal expansion of the two elements, cannot occur in the case of the precast concrete stair part according to the invention.

The precast concrete stair part according to the invention has elongated reinforcement elements which extend both into the foundation section and into the step section. The two sections of the precast concrete stair part are therefore statically connected to one another and can thus be loaded with high weights.

A concrete staircase for outdoor use, which is formed from a plurality of precast concrete stair-step elements according to the invention, is easy and inexpensive to install and at the same time has a high resistance to environmental influences. All precast concrete parts for stairs can be produced in the precast plant individually for a specific external staircase. On site, only the subsoil is leveled with an appropriate gradient and provided with a standard layer of gravel or sand concrete. The individual prefabricated concrete steps are then placed with their foundation section in the subsoil in such a way that the step sections forming the stairs are suitably aligned in the vertical and horizontal direction.

The cross section of the foundation section and/or the step section can be configured in almost any horizontal direction in the installed state. A circular cross-section for the foundation section and/or the step section is suitable, as is an oval cross-section or a cross-section composed of any number of planar sections. A cross-section composed of flat sections generally represents the envelope of a prism. The present invention is described below using a prism with four sections, i.e. a cuboid, but it should be emphasized that each of the sections can be divided into an essentially arbitrary number of further Sections can be divided. The horizontal cross section of such a foundation section and/or such a step section is then a polygon.

In other words, the base section and/or the step section has the shape of a cylinder, in particular a right circular cylinder or an elliptical cylinder, or the shape of a prism, in particular a right prism.

An embodiment is associated with particular advantages in which the base section has the shape of a conically tapering cylinder, i.e. a cone with a circular base, in particular a truncated cone, or a conically tapering elliptical cylinder, i.e. a cone with an elliptical base, or the shape of a conically tapering prism, i.e. a cone with a polygonal base or, to put it another way, a pyramid or a truncated pyramid. If a step is damaged, it may be necessary to replace a single precast concrete part of an existing concrete staircase. Despite the protruding step sections, the conically tapering foundation sections can prevent all steps arranged above the damaged step from having to be removed as well. Due to the foundation section tapering conically in a direction away from the step section, starting from the step section, the foundation section can also be introduced into the subsoil without any problems even when adjacent precast concrete parts have been installed.

According to a particularly preferred embodiment, the foundation section lateral surface has a plurality of flat partial foundation section lateral surfaces and/or the step section lateral surface has a plurality of flat partial step section lateral surfaces. As already mentioned, both the foundation section and the step section can basically have any shape. A particularly simple production is possible, however, if the respective lateral surface is made up of a plurality of flat lateral surface sections. If the foundation section has, for example, four partial surfaces of the foundation section, this results in a cuboid.

According to a particularly preferred embodiment of the present invention, the foundation section has a foundation section base surface intended for resting on the subsoil, a front foundation section lateral surface, a first lateral foundation section lateral surface adjoining the front foundation section lateral surface, a rear foundation section lateral surface adjoining the first lateral foundation section lateral surface and opposite the front foundation section lateral surface, and a rear foundation section lateral surface second lateral surface adjoining the rear foundation section lateral surface and opposite the first lateral foundation section lateral surface Foundation section lateral surface. The step section has a step section top surface provided as a tread surface, a step section base surface opposite the step section top surface, a front step section lateral surface adjoining the front step section lateral surface, a first lateral step section lateral surface adjoining the first lateral step section lateral surface and opposite the front step section lateral surface, and a rear step section lateral surface adjoining the rear step section lateral surface and the second lateral step portion lateral surface opposite the first lateral step portion lateral surface. The step section protrudes at least with its front step section lateral surface over the front foundation section lateral surface.

The designations "front" and "rear" lateral surface mean the arrangement of the respective surface from the perspective of an observer who wants to climb a staircase formed from precast concrete stair parts according to the invention.

The above embodiment describes a precast concrete stair part for forming a conventional stair with rectangular treads or with cuboid step sections. In principle, the foundation section and/or the step section can be designed in almost any shape. A particularly simple production is possible when both the step section and the base section are cuboid.

If the foundation section is in the form of a cuboid, embodiments are particularly preferred in which the horizontal extent of the foundation section extending from the first lateral foundation section lateral surface to the second lateral foundation section lateral surface is at least 15 cm, preferably at least 20 cm, particularly preferably at least 30 cm. amounts to. Also preferably, the vertical extent of the foundation section extending from the foundation section base area to the step section base area is at least 40 cm, preferably at least 60 cm, particularly preferably at least 80 cm.

With the dimensions mentioned, the requirements for sufficient stability of the foundation section and for its secure anchoring in the subsoil are met. On the other hand, of course, as little material as possible should be introduced into the subsoil, which is why the foundation section should not be oversized. For the expert provides an adequate dimensioning of the foundation section, taking into account the local conditions and the Expansion of the step section does not pose a problem. In particular, the person skilled in the art knows that the reinforcement introduced into the precast concrete part must have a minimum amount of concrete cover. Such a minimum concrete cover of usually 5 cm is required to prevent premature corrosion of the reinforcement. This technical specification must be taken into account when dimensioning the foundation section and placing the reinforcement elements in the foundation section.

If the step section is in the form of a cuboid, embodiments are particularly preferred in which the horizontal extent of the step section extending from the first lateral step section lateral surface to the second lateral step section lateral surface is at least 80 cm, preferably at least 120 cm, particularly preferably at least 150 cm. amounts to. Also preferably, the vertical extent of the step section extending from the step section base area to the step section cover area is at least 5 cm, preferably at least 10 cm, particularly preferably at least 15 cm.

With the dimensioning mentioned, the requirements for sufficient stability of the step section are met, in particular with regard to the action of force in the case of high loads that are transported over a staircase made of precast concrete parts according to the invention. On the other hand, as little material as possible should be used, which is why the step section should not be oversized. Adequate dimensioning of the step section, taking into account the loads occurring, is not a problem for the expert. As already mentioned above, the expert also knows that the reinforcement introduced into the precast concrete part must have a minimum concrete cover. Such a minimum concrete cover of usually 5 cm is required to prevent premature corrosion of the reinforcement. This technical specification must be taken into account when dimensioning the step section and placing the reinforcement elements in the step section.

According to the invention, the step section protrudes at least in a partial area of its step section lateral surface over the foundation section in a partial area of its foundation section lateral surface. In the case of a cuboid design of the foundation section and step section, this means that the step section arranged higher in the vertical direction preferably projects in the region of its front step section jacket surface over the step section arranged below. As already mentioned, the designation "front" lateral surface means the arrangement of the lateral surface from the perspective of an observer who is climbing a staircase formed from precast concrete stair parts according to the invention want. The front step section jacket surface of the step section arranged higher in the vertical direction is thus located in the vertical direction above the step section top surface of the step section arranged lower in the vertical direction. A staircase that is flush on both sides in the horizontal direction can be erected quickly and easily with the aid of a plurality of such precast concrete steps.

Particularly preferably, the step section protrudes with its first lateral step section lateral surface beyond the first lateral foundation section lateral surface. With the help of a plurality of such prefabricated stair step concrete parts, a stair that is flush on one side and runs parallel to a wing of a building, for example, can be erected quickly and without any problems.

Particularly preferably, the step section protrudes in two partial areas of its step section lateral surface over the foundation section in corresponding partial areas of its foundation section lateral surface. The step section preferably protrudes with its front step section lateral surface over the front foundation section lateral surface and the step section projects with its first lateral step section lateral surface over the first lateral foundation section lateral surface.

According to a further preferred embodiment, the step section also protrudes with its second lateral step section lateral surface beyond the second lateral foundation section lateral surface. In these embodiments, the step section thus protrudes beyond the foundation section on up to three sides. The above-described floating impression of the steps arranged one above the other can thus be realized better and better.

According to a further, very particularly preferred embodiment of the present invention, the step section also protrudes with its rear step section lateral surface beyond the rear foundation section lateral surface. In this case, the precast stair-step concrete part has a “mushroom-like” appearance, with a step section projecting in every direction being arranged on a columnar foundation section.

Preferably, not only a single elongate reinforcement element is provided in the precast concrete stair part, but rather a plurality of elongate reinforcement elements. At least two, preferably at least three, particularly preferably at least four of these elongated reinforcement elements have a foundation reinforcement section arranged in the foundation section and an im Step section arranged step reinforcement section. The step section and foundation section of the precast concrete stair part are therefore statically connected to one another and can thus be loaded with high weights without having to fear a break in the area of the step part. Basically, depending on the static requirements, essentially any number of such reinforcement elements can be provided.

Structural requirements may also make it necessary for additional reinforcement elements to be provided, with each of the additional reinforcement elements extending either exclusively in the foundation section or exclusively in the step section. Several of the elongate reinforcement elements, which have a foundation reinforcement section arranged in the foundation section and a step reinforcement section arranged in the step section, can be connected to one another by such reinforcements that extend exclusively in one of the sections, in the manner of a reinforcement frame. Such reinforcement frames can be provided both in the foundation section and in the step section.

Particularly preferably, the at least one elongate reinforcement element has a substantially linear design in its foundation reinforcement section and a substantially linear design in its step reinforcement section. The foundation reinforcement section encloses an angle of between 80° and 120° with the step reinforcement section, in particular an angle of between 85° and 100°, preferably an angle of around 90°. This configuration can be present both in part and in all of the plurality of elongate reinforcement elements. Due to the curved course of the reinforcement elements, a particularly good and permanent static connection and static load capacity of the prefabricated concrete part of the stair step are achieved.

The present invention also includes an external staircase consisting of at least three precast concrete steps as described above. When using precast stair step concrete parts according to the invention, an external staircase can be constructed with a significantly reduced construction time, which is associated with obvious economic advantages.

A drainage joint is preferably provided between adjacent precast concrete steps. When using a mat between the two precast concrete parts, a shadow gap is formed and rainwater can drain off between the two precast concrete parts. This embodiment also has the advantage that the desired step height can be adjusted. The height of the shadow gap can be adjusted to the height of the step section with a variable amount are added, which means that stairs with different step heights can be manufactured with precast concrete elements with the same height of the step section.

1. a) Bereitstellen einer Mehrzahl von Treppenstufenbetonfertigteilen wie oben beschrieben,
2. b) Bilden von Vertiefungen im Untergrund in dem mit der Außentreppe auszustattenden Bereich,
3. c) Einbringen eines Untergrundmaterials in die Vertiefungen,
4. d) Einbringen des jeweiligen Fundamentabschnitts der Treppenstufenbetonfertigteile in das Untergrundmaterial und den Untergrund derart, dass die Stufenabschnittgrundfläche des in vertikaler Richtung höher angeordneten Treppenstufenbetonfertigteils oberhalb der Stufenabschnittdeckfläche des benachbarten, in vertikaler Richtung niedriger angeordneten Treppenstufenbetonfertigteils angeordnet ist.

Finally, the present invention also includes a method for producing an external staircase comprising the steps

1. a) providing a plurality of prefabricated stair step concrete parts as described above,
2. b) creating recesses in the subsoil in the area to be equipped with the external staircase,
3. c) introducing a base material into the depressions,
4. d) Insertion of the respective foundation section of the precast concrete stair parts in the substrate material and the subsoil in such a way that the step section base area of the precast concrete stair part arranged higher in the vertical direction is arranged above the top surface of the step section of the adjacent precast concrete stair part arranged lower in the vertical direction.

The substrate material introduced into the depressions in step c) is preferably sand concrete.

Due to the use of precast stair step concrete parts according to the invention, the external staircase can be constructed in a significantly reduced construction time, which is associated with obvious economic advantages.

Brief description of the drawings

Fig. 1

in schematischer Darstellung eine perspektivische Ansicht eines Treppenstufenbetonfertigteils gemäß der Erfindung;

Fig. 2

in schematischer Darstellung eine Seitenansicht des Treppenstufenbetonfertigteils aus Figur 1;

Fig. 3

in schematischer Darstellung eine perspektivische Ansicht einer aus Treppenstufenbetonfertigteilen gemäß der Erfindung gefertigten Außentreppe mit drei Stufen;

Fig. 4

in schematischer Darstellung eine perspektivische Ansicht einer aus Treppenstufenbetonfertigteilen gemäß der Erfindung gefertigten Außentreppe mit mehreren Stufen.

The invention will be explained in more detail below using exemplary embodiments in connection with the drawings. However, it is expressly pointed out that the invention should not be restricted to the examples given. Show it

1

in a schematic representation a perspective view of a precast concrete stair part according to the invention;

2

a schematic representation of a side view of the precast concrete stair part figure 1 ;

3

in a schematic representation a perspective view of an external staircase with three steps made of precast concrete elements according to the invention;

4

in a schematic representation a perspective view of an outdoor staircase made of prefabricated concrete steps according to the invention with several steps.

Ways to carry out the invention

the figure 1 shows a schematic representation of a perspective view of a precast concrete stair part T according to the invention. The stair step precast concrete part T comprises a foundation section F and a step section S.

The foundation section F has a foundation section base area Fg intended to rest on the subsoil and a foundation section lateral surface. In the exemplary embodiment shown, the foundation section lateral surface comprises a front foundation section lateral surface Fv, a first lateral foundation section lateral surface Fs1 adjoining the front foundation section lateral surface Fv, a rear foundation section lateral surface Fh adjoining the first lateral foundation section lateral surface Fs1 and opposite the front foundation section lateral surface Fv, and a rear foundation section lateral surface Fh adjoining and second lateral foundation section lateral surface Fs2 opposite the first lateral foundation section lateral surface Fs1.

The step section S has a step section top surface Sd provided as a stepping surface, a step section base surface Sg opposite the step section top surface Sd, and a step section lateral surface. In the exemplary embodiment shown, the step section lateral surface comprises a front step section lateral surface Sv, a first lateral step section lateral surface Ss1 adjoining the front step section lateral surface Sv, a rear step section lateral surface Sh adjoining the first lateral step section lateral surface Ss1 and opposite the front step section lateral surface Sv, and a rear step section lateral surface Sh adjoining and second lateral step section lateral surface Ss2 opposite the first lateral step section lateral surface Ss1.

The foundation section F is introduced into the ground to form an external staircase and anchored there. A recess is provided in the foundation section F, which on the one hand saves material and on the other hand allows the laying of cables and pipes.

From the figure 1 It can be clearly seen that the step section S protrudes with its front step section lateral surface Sv over the front foundation section lateral surface Fv. In the exemplary embodiment shown, the step section base area Sg is visible and accessible in this projecting partial area. The horizontal extent hAF of the foundation section F extends from the first lateral foundation section lateral surface Fs1 to the second lateral foundation section lateral surface Fs2 and is 30 cm in the exemplary embodiment shown.

The horizontal extent hAS of the step section S extends from the first lateral step section lateral surface Ss1 to the second lateral step section lateral surface Ss2. In the exemplary embodiment shown, the horizontal extent hAS of the step section S is identical to the horizontal extent hAF of the foundation section F and is also 30 cm.

figure 2 shows a schematic representation of a side view of the precast concrete stair part figure 1 . In addition to those related to the figure 1 The parts and dimensions already explained are based on the figure 2 the vertical extent vAF of the foundation section F and the vertical extent vAS of the step section S. The vertical extent vAF of the foundation section F extends from the foundation section base area Fg to the step section base area Sg and is 90 cm in the exemplary embodiment shown. The vertical extent vAS of the step section S extends from the step section base area Sg to the step section top area Sd and is 15 cm in the exemplary embodiment shown.

In figure 2 It can also be seen that the precast concrete part T for the steps has elongated reinforcement elements A, the reinforcement element A shown having a foundation reinforcement section FA arranged in the foundation section F and a step reinforcement section SA arranged in the step section S.

The reinforcement element A is essentially linear both in its foundation reinforcement section FA and in its step reinforcement section SA, with the foundation reinforcement section FA having one step reinforcement section SA includes an angle of around 90°. The reinforcement element A thus extends both into the foundation section F and into the step section S. The two sections S, F of the precast concrete part T for steps are therefore statically connected to one another and can thus be loaded with high weights.

figure 3 shows a schematic representation of a perspective view of an external staircase made of three precast concrete parts T according to the invention. The step section S projects beyond the foundation section F in all four directions. Specifically, the step section S protrudes with its front step section lateral surface Sv beyond the front foundation section lateral surface Fv, it protrudes with its first lateral step section lateral surface Ss1 above the first lateral foundation section lateral surface Fs1, it protrudes with its second lateral step section lateral surface Ss2 above the second lateral foundation section lateral surface Fs2 and it protrudes with its rear step section lateral surface Sh beyond the rear foundation section lateral surface Fh. The concrete dimensions of the foundation section F, the step section S and the protruding sections of the step section S are selected in such a way that the foundation sections F of the individual precast concrete stair elements T remain invisible to the user of the stairs, giving the impression that the individual tread plates are floating one above the other.

Finally shows the figure 4 in a schematic representation a perspective view of an external staircase with several steps made of precast concrete elements T according to the invention. In this exemplary embodiment, the step section S protrudes exclusively with its first lateral step section lateral surface Ss1 beyond the first lateral foundation section lateral surface Fs1.

Reference List

A

reinforcement elements

f

foundation section

FA

foundation reinforcement section

fg

foundation section footprint

fh

rear foundation section lateral surface

fs1

first lateral foundation section lateral surface

Fs2

second lateral foundation section lateral surface

Fv

front foundation section lateral surface

hAF

horizontal expansion of the foundation section

hAS

horizontal extent of the step section

S

step section

SA

step reinforcement section

sd

step section deck surface

sg

step section footprint

sh

rear step section lateral surface

Ss1

first lateral step section lateral surface

Ss2

second lateral step section lateral surface

Sv

front step section lateral surface

T

Precast concrete stair part

vAF

vertical expansion of the foundation section

vAS

vertical extension of the step section

Claims (15)

Precast concrete stair part (T) having a foundation section (F) and a step section (S), wherein the foundation portion (F) comprises - a foundation section base area (Fg) intended to rest on the subsoil and - a foundation section lateral surface, wherein the step portion comprises (S). - a step section top surface (Sd) intended as a stepping surface, - a step section base surface (Sg) opposite the step section top surface (Sd) and - a step section lateral surface, wherein the foundation section (F) is designed and set up for anchoring the precast concrete part (T) of the stair step in the subsoil, wherein the step section (S) protrudes at least in a partial area of its step section lateral surface over the foundation section (F) in a partial area of its foundation section lateral surface, wherein the stair step precast concrete part (T) has elongated reinforcement elements (A), at least one of the elongate reinforcement elements (A) having a foundation reinforcement section (FA) arranged in the foundation section (F) and a step reinforcement section (SA) arranged in the step section (S). Precast concrete stair part (T) according to Claim 1, characterized in that the foundation section (F) and/or the step section (S) is designed as a cylinder, in particular as a right circular cylinder or elliptical cylinder, or as a prism, in particular as a right prism. Precast concrete stair part (T) according to Claim 1 or 2, characterized in that the foundation section (F) is designed as a cone with a circular base, in particular as a truncated cone with a circular base, as a cone with an elliptical base, in particular as a truncated cone with an elliptical base, or as a cone with a polygonal Base area, in particular as a pyramid or truncated pyramid, is formed. Precast concrete stair part (T) according to one of Claims 1 to 3, characterized in that the foundation section lateral surface has a plurality of flat foundation section lateral partial surfaces and/or the Step section lateral surface has a plurality of planar step section lateral partial surfaces. Precast concrete stair part (T) according to one of Claims 1 to 4, characterized in that the foundation section (F) has - a foundation section base area (Fg) intended to rest on the subsoil, - a front foundation section lateral surface (Fv), - a first lateral foundation section lateral surface (Fs1) adjoining the front foundation section lateral surface (Fv), - a rear foundation section lateral surface (Fh) adjoining the first lateral foundation section lateral surface (Fs1) and lying opposite the front foundation section lateral surface (Fv) and - a second lateral foundation section lateral surface (Fs2) adjoining the rear foundation section lateral surface (Fh) and opposite the first lateral foundation section lateral surface (Fs1), wherein the step portion comprises (S). - a step section top surface (Sd) intended as a stepping surface, - a step section base surface (Sg) opposite the step section top surface (Sd), - a front step section lateral surface (Sv), - a first lateral step section lateral surface (Ss1) adjoining the front step section lateral surface (Sv), - a rear step section lateral surface (Sh) adjoining the first lateral step section lateral surface (Ss1) and lying opposite the front step section lateral surface (Sv) and - a second lateral step section lateral surface (Ss2) adjoining the rear step section lateral surface (Sh) and opposite the first lateral step section lateral surface (Ss1), wherein the step section (S) protrudes at least with its front step section lateral surface (Sv) over the front foundation section lateral surface (Fv). Precast concrete stair part (T) according to one of Claims 1 to 5, characterized in that the horizontal extension (hAF) of the foundation section (F) extending from the first lateral foundation section lateral surface (Fs1) to the second lateral foundation section lateral surface (Fs2) is at least 15 cm, preferably at least 20 cm, particularly preferably at least 30 cm
and or
the vertical extension (vAF) of the foundation section (F) extending from the foundation section base area (Fg) to the step section base area (Sg) is at least 40 cm, preferably at least 60 cm, particularly preferably at least 80 cm. Precast concrete stair part (T) according to one of Claims 1 to 6, characterized in that the horizontal extension (hAS) of the step section (S) extending from the first lateral step section lateral surface (Ss1) to the second lateral step section lateral surface (Ss2) is at least 80 cm, preferably at least 120 cm, particularly preferably at least 150 cm. Precast concrete stair part (T) according to one of Claims 1 to 7, characterized in that the vertical extent (vAS) of the step section (S) extending from the step section base area (Sg) to the step section top surface (Sd) is at least 5 cm, preferably at least 10 cm , particularly preferably at least 15 cm. Precast concrete stair part (T) according to one of Claims 1 to 8, characterized in that the step section (S) projects with its first lateral step section lateral surface (Ss1) beyond the first lateral foundation section lateral surface (Fs1).
and or the step section (S) protrudes with its second lateral step section lateral surface (Ss2) over the second lateral foundation section lateral surface (Fs2) and/or the step section (S) protrudes with its rear step section lateral surface (Sh) over the rear foundation section lateral surface (Fh). Precast concrete stair part (T) according to one of Claims 1 to 9, characterized in that a plurality of elongate reinforcement elements (A) are provided, with at least two, preferably at least three, particularly preferably at least four of the elongate reinforcement elements (A) having a base section (F ) arranged foundation armouring section (FA) and in the step section (S) arranged step armouring section (SA). Precast concrete stair part (T) according to one of Claims 1 to 10, characterized in that additional reinforcement elements are provided, each of the additional reinforcement elements extending either exclusively in the foundation section (F) or exclusively in the step section (S). Precast concrete stair part (T) according to one of Claims 1 to 11, characterized in that the at least one elongate reinforcement element (A) is designed to be essentially linear in its foundation reinforcement section (FA) and is designed to be essentially linear in its step reinforcement section (SA), the Foundation reinforcement section (FA) with the stepped reinforcement section (SA) at an angle between 80° and 120°, in particular an angle between 85° and 100°, preferably an angle of around 90°. External staircase consisting of at least three precast concrete steps (T) according to one of Claims 1 to 12. External staircase according to Claim 13, characterized in that a drainage joint is provided between adjacent prefabricated concrete steps (T). Method for manufacturing an outdoor staircase comprising the steps a) providing a plurality of precast concrete stair parts (T) as defined in claims 1 to 12, b) creating recesses in the subsoil in the area to be equipped with the external staircase, c) introducing a base material into the depressions, d) Insertion of the respective foundation section of the precast concrete stair parts (T) into the substrate material and the subsoil in such a way that the step section base area (Sg) of the precast concrete part (T) arranged higher in the vertical direction is above the top surface (Sd) of the adjacent precast concrete stair part arranged lower in the vertical direction (T) is arranged.

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