DE69825416T2 - Reinforced concrete monolithic staircase for spiral staircases and spiral staircase provided with it - Google Patents

Abstract

Monolithic helical step (10) made of reinforced concrete, suitable for obtaining helical staircases, in the proximity of the internal side surface (11) of which a through hole (12), which is located parallel to the tread plane (18), is suitably positioned to receive a concrete or resin casting inside it and a falsework member (13) by means of which the connection of a plurality of superimposed steps (10) is assured. <IMAGE>

Description

Technical specification

The The invention relates to a monolithic reinforced concrete Stair step, suitable for use as a basic building block of a spiral staircase, in general known as "spiral Staircase ", where the monolithic step has a fixed structure and shape, so that the production of unlimited high and structurally secure Spiral stairs possible is.

The The invention relates in particular to the construction industry, especially the precast industry.

State of technology

The Use of forms, which for the production of reinforced concrete stair steps are suitable, is after known in the art, the forms are generally made a variety of interconnected elements that make it by filling allow with concrete, the desired To get stair step.

in the Generally, the prior art molds have a base member on, on the suitably shaped walls are arranged perpendicular to it, which is a tread element, a riser element or the inner and outer side surfaces of the step limit.

The Elements, that is the base element and the walls, are interconnected by suitable mechanical means, e.g. Screws, bolts, bushes and tie rods.

On this way you can the elements after filling of the space created by their mutual connection be, and the stairs obtained can be interconnected be so that the desired Spiral staircase can be completed.

To In the prior art, grooves are formed on the outer surface of each step provided with a substantially semicircular cross section, wherein the grooves receive suitable metal rods and accordingly the shape of the outer surface arranged can be.

Of Further are the metal bars along a spiral Rail arranged so that to make the desired staircase a step can be connected to another, the connection through at the edges of the surface attached complementary Areas is facilitated, so that in the position of the riser a compulsion to the next Kicked exercise becomes.

consequently this means that as soon as the first step with a suitable, viable, the kick of the first step receiving surface on the ground placed and suitably anchored, the second step and successively all other stairs can be positioned by their Steep steps are placed directly on the kick.

The exact arrangement of the stairs is characterized by a continuous Ensuring connection of the front and rear side connectors of the outer side surfaces.

To Completion of the connection of a predetermined plurality of steps the structure is anchored by placing metal rods in the semi-circular, on the outer and each area is covered Stair step attached grooves are inserted.

Furthermore will be in a later operation those attached to the outer surfaces metal rods fastened with a soft metal wire, while those on the inner surfaces are attached to a suitable, within the corresponding Grooves provided anchors are moored.

After this the metal bars into the grooves of the inner and outer surfaces of the are thus placed spiral staircase, the metal rods are with a Cement mortar coated.

Of Further, the inner and outer surfaces of a every step of the prior art with metal meshes provided, which is a supporting work the surfaces form; about that In addition, to form the supporting structure of the footstep of the step some suitable rods joining the grid longitudinal to the contour arranged the step.

Of the Main drawback of monolithic spiral stairs on the state The technique is that it is not possible is to produce infinitely high spiral staircases, as by continuous Connect each stair step made according to the prior art Structure, not stable and secure enough to put one over Floor to ensure exceeding size.

Especially is the to the inner side surface corresponding interface pretty critical, since it is where the connection of a stair step to the next only by the suitably shaped, enabling a correct connection Profile and by the presence of suitable metal rods, the are in suitable provided on the inner side surfaces grooves is ensured.

The proposed solution with the document FR-A-2653473 suggests the through holes in the monolithic steps near the (radial) internal parts to fill the steps with concrete. After this solution However, there is a particularly critical point, blazed by the area where two steps are joined together, because the surfaces the cuff, each step with a stored above it connects, completely are vertical, which is why the interface is small and quite weak is.

description the invention

aim It is the object of the present invention to overcome the disadvantages of the prior art Eliminate the technique by using a monolithic step made of reinforced concrete, which is the basic building block of a spiral staircase can be used, wherein the monolithic stair step a has suitable structure and shape, which is the production of a allow infinitely high and structurally safe spiral staircase.

The The above object is achieved by the features disclosed in the main claim reached.

The dependent claims treat particularly advantageous embodiments of the invention.

To proviso the invention has provided for the production of spiral staircases Staircase nearby their inner surface a through hole, which for filling with concrete and for performing a Metal rod is suitable to connect a variety of one above the other to reach stored stairs.

The consistent Hole is obtained by having a conjugate hole on the sidewalls of a for producing the desired Stair step used form is provided.

at the manufacture of the staircase is when the mold for manufacturing the step is arranged, the hole with a metal bar occupied, leaving the hole during the following filling with concrete is not closed with concrete.

After this the filling is completely solidified, the step by disassembling the Elements of the mold and removing the metal rod are dissolved out to a To get step step with a suitable hole on its inner surface.

Therefore becomes like that while Making the spiral staircase the inside of the hole with concrete filled and then introduced a suitable metal rod, with which an effective and secure coupling of a plurality of successive steps the staircase can be reached.

Besides that is it is possible a significantly increased structural stability for the To ensure stairs especially in the critical area, that is on the inner surface.

Of Further ask the holes each step of the invention a simple and perfect frame of reference for the assembly of the stairs when the steps are carefully stored one above the other have to.

To an advantageous feature of the invention is the structural Safety further increased, by a supporting mechanism in the form of a metal bar, which is longitudinal to the step of the step is arranged, wherein the metal rod without interruption along the whole length the front peripheral edge of the footstep, around the hole and further along the rear peripheral edge of the footstep is.

In indeed possible above embodiment of the invention, an increase in the structural stability of each Stair step and the whole staircase near the inner surface, the as mentioned above particularly critical and limiting for those on a spiral staircase reachable height is.

According to the invention is that in the circular Area provided hole near the inner surface of each Step with respect to the vertical slightly tilted, leaving a sinuous shape of the stairs can be achieved.

Of Further, according to the invention, the Hole the stair step on a slightly frustoconical section on, so that each subsequent step a larger, by the previous step given support surface has, why it also possible is to realize a more stable and secure structure.

Regarding the Installation of a staircase, which is made of stairs according to the invention, the most important work phases are disclosed below.

First it is necessary to produce the concrete stair steps separately, the concrete stair steps are made with molds whose side walls, such as mentioned above, near their connection to the base element are rounded and with a appropriate hole on the inner side of the desired step are.

Then, after the first step in accordance with a known manner in this speci In the technical area of the floor, a metal bar having a predetermined length and section is positioned in the hole of the first step in the vicinity of its inner surface.

Then be successively the other steps on the first Stair step deposited by placing the above metal rod in the appropriate holes the steps introduced becomes.

is assembled a predetermined sequence of steps, the space between the insides of the holes becomes each one Stair step and the metal rod running along all steps with a high strength concrete or similar material, e.g. one Resin, infects.

On this way is the filling a stable and reinforced Connecting the stairs with the metal bar securely and gives the Spiral staircase an excellent strength.

After this the concrete or resin is completely solidified, the Spiral staircase further increased, by a second metal rod having a predetermined length to the previously welded rod is welded.

In one similar to the above phases Way, the other steps are superimposed on the previous steps, until the stairs are up to you Height reached Has.

Out For this reason, the heights reached are of spiral staircases, which with the steps according to the invention are made larger than those which can be reached with spiral staircases according to the prior art.

The is possible according to the invention, since the inner section of the spiral staircase in the erected state in indeed a spiral shaped pillar is.

For example Is it possible, a height of about 15 meters, instead of a usual maximum height of about 2.8 to 3.0 meters, usually is achieved with spiral staircases according to the prior art.

Of Other possesses thanks to the above-described constructive nature and Way, which is a stable interconnection of all stairs and the placement of a suitable gain in structurally critical Enables areas that obtained spiral staircase advantageous antiseismic features, the not to be found at traditional spiral staircase.

Declaration of drawings

Further Features and advantages of the invention will be apparent from the lecture the following description given as a non-limiting example with the aid of the attached drawings Figurines, where

1 shows a plan view of a staircase according to the invention,

2 the longitudinal arrangement of the metal rod in the step of the 1 shows, and

3 a perspective view of a spiral staircase made with steps according to the invention shows.

description an embodiment

In the 1 and 2 denotes the reference numeral 10 a monolithic staircase of tortuous type, according to the invention.

According to the invention, the stair step 10 near her inner surface 11 a rounded shape, within a hole 12 is, taking the hole 12 in the plane of the kick 18 (according to the level of 1 and 2 ) is positioned and through the whole thickness of the step 10 runs.

The hole 12 is suitable for inserting a metal rod 13 acting as a support for the step 10 is used.

As mentioned above, the hole becomes 12 Obtain the sidewalls by making the desired stair step 10 used mold are provided with a corresponding hole and by during the phase of filling with concrete in the hole 12 a metal rod used to create the hole is located.

According to the invention, the axis of the hole 12 Slightly tilted with respect to the vertical, to allow the staircase to be built vertically during assembly of the monolithic staircases and to have a tortuous shape.

Furthermore, the hole points 12 a slightly frusto-conical section towards the base of the step 10 converges so that each successive step has a greater given by the previous step support surface, which makes it possible to obtain a stable and secure structure.

According to the invention, the structural security of the spiral staircase continues through one or more longitudinal steps to the step and parallel Metal bars attached to the surface of the step of the step 15 elevated.

The metal bars 15 run along the front peripheral edge 16 of the kick 18 , over the area around hole 12 and sit down along the rear peripheral edge 17 of the kick.

The particular embodiment of the invention makes it possible to increase the structural stability of each step and the entire staircase, mainly in the vicinity of the inner side surface 11 the step 10 This area is particularly critical for the overall height of the spiral staircase.

Claims (4)

Monolithic spiral staircase made of reinforced concrete ( 10 ) for the production of spiral staircases, wherein an area in the vicinity of the inner surface ( 11 ) of the step ( 10 ) a through hole ( 12 ), which is parallel to the step ( 18 ) and is suitable to be filled with concrete or synthetic resin and a supporting structure ( 13 ), whereby the interconnection of a plurality of superimposed steps ( 10 ), characterized in that the axis of the through hole ( 12 ) is slightly tilted with respect to the vertical and that the hole ( 12 ) has an area which in the direction of the base of the step ( 10 ) converges. Stair step ( 10 ) according to claim 1, characterized in that the supporting structure ( 13 ) is a metal rod. Stair step ( 10 ) according to one of the preceding claims, characterized in that it comprises at least one continuous metal rod ( 15 ), which is parallel to the step ( 18 ) along the front (16) and rear (17) contour edge of the step ( 10 ) is arranged, and wherein the supporting work ( 15 ) near the inner surface ( 11 ) partly from the hole ( 12 ) is surrounded. Spiral staircase, characterized in that they overlap and connecting a plurality of steps in accordance with a of the preceding claims is made.