ES2755176T3 - Staggered tribune segment and assembly procedure - Google Patents

Abstract

Stepped tribune segment (1) from several structural elements (2, 3, 4) joined together with the possibility of dismantling that comprises two step supports (2) arranged side by side at a distance and joined together through of several crossbars (3), as well as base plates (4) that cover the areas formed between the step supports (2) and the crossbars (3), the crossbars (3) respectively forming the front sides of the tribune steps, limiting their ends laterally with the step supports (2) and penetrating the step supports (2) and the crossbars (3) respectively in the boundary zone forming a positive connection between the crossbar (3) and the step support (2 ) in the direction of the force of gravity and in all the horizontal directions, especially in all the transverse directions with respect to the longitudinal extension of the crossbar (3) and in all the horizontal directions, configuring the crossbars (3) and step supports (2) so that the respective connection between them for mounting the tribune segment (1) can be created by inserting projections (5a, 5b) formed in the crossbars (3) in housings (6a, 6b) formed in the step supports (2) for the projections (5a, 5b) and said union can be separated for dismantling the rostrum segment (1) by removing the projections (5a, 5b) of the housings (6a, 6b) in the opposite direction, configuring the crossbars (3) and the step supports (2) so that the union between them for the assembly of the tribune segment (1) can be created by inserting the projections (5a, 5b) in the housings (6a, 6b) in a direction transverse to the longitudinal extension of the crossbars (3), penetrating the crossbars (3) respectively with several protrusions (5a, 5b), formed at their end respectively, laterally on the corresponding step support ( 2), forming the positive connection between the crossbar (3) and the step support (2) in the direction of the force of gravity and in all horizontal directions, especially in all directions transverse to the longitudinal extension of the crossbar (3 ) and in all horizontal directions, at least two, especially exactly two, protrusions separated from each other (5a, 5b) in a direction transverse to the longitudinal direction of the respective crossbar (respectively) being formed at the ends of the crossbars (3) respectively. 3), characterized in that the crossbars (3) and the step supports (2) are configured in such a way that for the creation of the respective connection between the crosspiece (3) and the step support (2) for mounting the segment of tribune (1) it is necessary to insert, completely or at least in part, a first projection (5a) of the at least two projections (5a, 5b) in the housing (6a) assigned to it of the step support (2) before insertion on a second projection (5b) of the at least two projections (5a, 5b) in the housing (6b) assigned to it of the step support (2), and because the crossbars and the step supports are configured in such a way that the insertion of the first projection (5a) of the at least two projections (5a, 5b) in the housing (6a) assigned to it a) must be carried out from the upper side of the step support before the insertion of the second projection of the at least two projections in the housing assigned to it from the front side of the step support or b) must be carried out from the front side of the respective step support (2) before the insertion of the second projection (5b) of the at least two projections (5a, 5b) in the housing (6b) assigned to it from the upper side of the step support (2).

Description

DESCRIPTION

Staggered tribune segment and its assembly procedure

The invention relates to a stepped tribune segment, to a tribune comprising several such tribune segments, and to an assembly method for assembling a tribune segment such as this according to the preambles of the independent patent claims.

Technical scope

The grandstands are often temporary structures that are built for a single event and then dismantled again.

In this case, it is of great importance that these rostrum constructions are absolutely safe in all conceivable conditions of use and that specialized personnel can assemble and disassemble them in the shortest possible time with the fewest number of assembly personnel (to often hired on site). The various components from which these grandstand structures are built should also be stored in the smallest possible space and weigh as little as possible.

From GB 2 433 078 A a tribune system is known in which the tribune is made up of a plurality of two-step tribune segments. These tribune segments are respectively made up of two lateral lattice girders that are joined to each other by means of height-adjustable adaptation pieces fixed on them and suspended crossbeams on the front face of these adaptation pieces. Here, in addition to adjusting the height of the adaptation parts on the truss girders, it is also possible to choose the suspension height of the cross members on the adaptation parts.

Although this known grandstand system offers great flexibility with respect to the height of the grandstand steps, which is what is desired in some cases, it has the disadvantage that the connection between the side truss girders and the crossbars through The adaptation parts are structurally deficient and that, due to the multiple configuration possibilities, the risk of assembly errors is high in the case of inexperienced assembly personnel.

DE 18 05 755 A1 discloses a stepped tribune segment consisting of step supports, cross members and base plates detachably joined, the cross members being able to be inserted from above into the corresponding receiving profile contours on the side of the step supports to create the connection to the step supports with T-shaped profile heads arranged at their ends.

Document FR 2 295 190 A1 discloses a stepped tribune segment formed by step supports, crossbars and base plates detachably connected to each other, the crossbars being inserted from the front into corresponding receiving holes in the front face of the supports of the step with its hook elements arranged on its rear faces, in order to create the connection to the step supports.

Document EP 2 557 255 A2 discloses a stepped tribune segment formed by step supports, cross members and base plates detachably joined together, the cross members being positioned, to create the connection to the step supports, on the lateral surfaces of the Step supports by horizontal insertion from the front through the assigned fixing lugs, respectively with joint covers arranged at their ends pointing backwards with reception holes. Then, the fixing projections on the step supports engage with the receiving holes of the joint covers by means of a vertical descent of the respective crossbar.

Document US 2002/078633 A1 discloses a stepped tribune segment formed by step supports, cross members and base plates detachably joined together, the cross members being inserted, to create the connection to the step supports, from above in the contours of corresponding reception on the side of the step supports with hooks and joint covers arranged at their ends.

Representation of the invention

The task is to make available a system of stands that does not present or at least partially avoids the drawbacks of the state of the art mentioned above.

This task is solved with the objects of the independent patent claims.

According to these, a first aspect of the invention refers to a tribune segment that forms several tribune steps, and which is constructed from structural elements joined together with the possibility of disassembly. These structural elements comprise two step supports arranged side by side at a distance, several crossbars that join the step supports together and that form the front sides of the tribune steps, as well as base plates that cover the areas formed between the step supports and crossbars and forming the upper sides of the grandstand steps.

The crossbars limit their ends laterally with the step supports. In this case, the step supports and the cross members respectively penetrate into this border area so that a joint is created in drag shape between them, at least in the direction of the force of gravity and in all horizontal directions. Advantageously, this connection is also positive in all directions transverse to the longitudinal extension of the crossbar, that is, also in the vertical direction against the direction of the force of gravity.

Here the cross members and the step supports are configured so that the respective connection between them can be created during the assembly of the tribune segment by inserting the projections formed on the crosspieces in the housings formed in the step supports for these projections. , said union being able to be canceled again during the dismantling of the rostrum segment, removing the projections from the housings in the opposite direction. In this way it is possible to make available a tribune system with structurally very stable tribune segments that can be assembled easily and safely.

The cross members and step supports are configured so that the connection between them can be created during the assembly of the tribune segment by inserting the projections in the housings in a direction transverse to the longitudinal extension of the cross members. This results in the advantage that solutions are possible in which the step supports can be arranged at the mounting location in their final mounting position and be attached without further changes in position to the crossbars, forming the support structure of the tribune segment according to the invention.

In this case, the cross members penetrate laterally into the step supports respectively with several protrusions formed at their ends, establishing the aforementioned positive connection between the crosspiece and the step supports.

Since the protrusions that serve to form the joint are formed exclusively at the ends of the crossbars, it is possible to configure the sides of the step supports flat and without protrusions, which has an advantageous effect on their stackability. Furthermore, it is easier and cheaper to equip the crossbars, advantageously formed by aluminum profiles, at their ends with projections according to the claim in the form of stable and low-wear fixing pivots, than to provide them with stable and secure housings for the pivots of fixing formed on the step supports.

At the ends of the cross members there are at least two, preferably exactly two, projections according to the claim separated in a direction transverse to the longitudinal direction of the respective cross member. In this way it is possible to achieve, in a simple and economic way, a great stability and, in particular, a high angular rigidity of the connections between the cross members and the step supports, especially in the preferred case that each of these projections forms a positive connection between the crossbar and the step support pointing outwards from the respective step support in the longitudinal direction of the crosspiece.

In this case, the crossbars and the step supports are configured in such a way that, for the creation of the joints between the crossbars and the step supports during the assembly of the tribune segment, the insertion of a first projection of the at least two projections completely or at least partially in the housing assigned to it of the respective step support before the insertion of a second projection of the at least two projections in the housing assigned to it of the respective step support. As a consequence, solutions are possible that guarantee a particularly safe and simple assembly, for example, placing the crossbars in a defined position with respect to the step supports by inserting the aforementioned first projections in the assigned housings in the step supports and , then guiding them through the first protrusions arranged in the housings, rotating or displacing them to a position from which the aforementioned second protrusions are inserted into the housings assigned to them.

In a first variant of the tribune segment according to the invention, the crossbars and the step supports are configured so that the insertion of the first protrusions must be carried out in the housings assigned to them from the upper side of the step supports. prior to insertion of the second projections into the housings assigned to them from the front side of the step supports.

In the case of a second variant of the tribune segment according to the invention, the crossbars and the step supports are configured so that the insertion of the first protrusions in the housings assigned to them must be carried out from the front side of the step supports. before the insertion of the second projections in the housings assigned to them from the upper side of the step supports.

Because the crossbars and step supports are configured so that the insertion of the crossbar protrusions into the assigned housings of the step supports is carried out from the top side and from the front side of the step supports The advantage is that a particularly secure and less effortless assembly of the tribune segment is possible, since the crossbars (in case of a suitable configuration of the step supports) can be pushed during assembly with their ends resting on the Step brackets to their mounting position on the step brackets and then fasten to them.

In the second variant it is preferable that the at least two projections comprise an upper projection and a lower projection and that the crossbars and the step supports are configured so that the insertion of the lower projection in the housing assigned to it must be carried out from the front side of the step bracket prior to insertion of the top ledge into the housing assigned thereto from the top side of the step bracket. Such an embodiment has been found to be particularly easy to assemble.

In another preferred embodiment of the tribune segment according to the invention, the cross members and the step supports are configured such that, for insertion of the projections in the housings, the cross members must be rotated or moved during assembly, respectively, around a axis that develops parallel to its longitudinal axis with respect to the step supports and in such a way that, for the removal of the projections outside the housings, they must be turned backwards or moved backwards correspondingly during removal. Embodiments of this type offer the advantage that it is relatively simple to secure the joints between the cross members and the step supports against a separation of the joint by removing the projections outside the housings, the cross members being secured against rotation.

The joints between the cross members and the step supports are preferably secured with the base plates against a gap of the joint by removing the projections outside the housings. Thus it is necessarily necessary to secure these joints when the rostrum is ready for its intended use.

Preferably, the base plates of the tribune segment are secured by their limit edges, which limit with the respective crossbars that form the front surface of the tribune step located above, against a lifting by means of this crossbeam in form drag and / or supported by the same.

For this purpose, it is advantageous for the base plates to be inserted in a slot on the front side of this crosspiece respectively in one of its edges that is adjacent to the respective crosspiece that forms the front surface of the tribune step located above. In this way, the protection against lifting as well as the support function can be carried out in a simple and safe way.

In this case it is further preferable that the lower limit of the groove, on which the respective base plate rests, is located fundamentally flush with the support surfaces formed on the step supports for the lateral areas of the respective base plate. As a consequence, an improved stability of the tribune step results, being possible to close the base plates during assembly respectively with the limit edge placed in front and intended to limit with the respective crossbar that forms the front surface of the tribune step located above, leaning on the Support surfaces formed on the step supports towards this crossbar. In this way, an especially safe and less effortless installation is possible, particularly when the bearing surfaces formed on the step supports are laterally limited by guide elements such as the guide ribs, which is preferable, so that the respective base plate is laterally guided when placed on these support surfaces and when inserted into the groove of the crossbar.

Advantageously, the base plates are supported by this cross member respectively in the area of their limit with the cross member that forms the front face of the step formed with them. The result is an especially stable and safe construction.

Furthermore, it is advantageous that the base plates are secured in a form-driven manner against lifting by means of this cross member respectively in the area of their limit with the cross member that forms the front face of the step formed with them.

This is advantageously carried out in such a way that the base plates fit into an undercut in the crossbar respectively in the area of its boundary with this crossbar with a profile contour extending along this boundary, creating a positive bond to this crossbar against a lifting of the base plate in said area. Here, the base plates and the cross members are preferably configured so that, in the absence or removal of any fixing device, the respective base plate can be moved in its plate plane to separate the positive connection and so that the fit of the profile contour of the base plate in the undercut of the cross member is canceled. Solutions of this type have been found to be particularly easy to assemble.

In this case, it is also preferable that the base plates are secured in form drag by the functional components of the tribune, preferably by the components of the tribune seats, against a displacement that would lead to a cancellation of the positive connection against a lift. . As a consequence, a fixing of the base plates automatically results when the rostrum is ready for use. In general, it is preferable that the joints between the step supports and the crossbars can be made without tools and can be removed again without tools, and especially that additional components such as screws or bolts are not necessary to create these joints. security. In this way, tools and parts cannot be forgotten or lost, and assembly is greatly facilitated, which is often done in difficult conditions and at a height of several meters.

A second aspect of the invention relates to a tribune comprising several tribune segments according to the first aspect of the invention. In this case, the tribune segments arranged next to each other have common step elements. The formation of tribunes of this type represents the intended use of the tribune segments according to the first aspect of the invention.

A third aspect of the invention relates to a method for mounting a tribune segment according to the first aspect of the invention. Here, two step supports are arranged at a distance from each other and are joined by several cross members forming a common support structure, the projections, formed on the cross members and / or on the step supports being inserted in a direction transverse to the extension longitudinal of the crossbars, in the housings formed in the step supports and / or in the crossbars for the projections, whereby the crossbars are arranged between the step supports, creating a positive connection between the crossbars and the step supports in the direction of the force of gravity and in all horizontal directions, preferably in all directions transverse to the longitudinal extent of the crossbar and in all horizontal directions. This results in the advantage that the step supports can be arranged in their final mounting position at the mounting location and subsequently joined without further change of position to the cross members forming the support structure of the tribune segment according to the invention .

This is carried out so that the protrusions that separate from the front sides of the crossbars in their longitudinal direction are inserted, in a direction transverse to the longitudinal extension of the crossbars, in the housings formed in the step supports for the outgoing.

In this case, according to a first variant of the method according to the invention, by means of the use of cross members, which have on their front sides respectively an upper projection and a lower projection, for the connection of the respective crosspiece to the two step supports, the projections The top of the crossbar are first inserted from the top side of the step supports into the housings assigned to these protrusions on the step supports. The crossbar is then rotated or displaced around an axis that runs parallel to its longitudinal axis and the lower protrusions of the crossbar are inserted from the front side of the step supports into the housings assigned to these protrusions on the step supports. .

According to a second variant of the method according to the invention, through the use of cross members, which have on their front sides respectively an upper projection and a lower projection, for the connection of the respective crosspiece to the two step supports, the lower protrusions of the crosspiece are They first insert from the front side of the step supports into the housings assigned to these projections in the step supports. The crossbar is then rotated or displaced about an axis that runs parallel to its longitudinal axis and the top ribs of the crossbar are inserted from the top side of the step supports into the housings assigned to these protrusions on the step supports. .

A procedure such as this allows particularly safe and easy mounting, since the crossbars can be placed in a defined position with respect to the step supports by inserting a part of the projections in the housings assigned to them in the step supports. and then guided by these protrusions already arranged in their housings, and rotated or moved to a position from which the other protrusions can be controlled and inserted without great effort in the housings assigned to them.

In a preferred embodiment of the method, the crossbars are pushed into their mounting position during assembly, resting on the support surfaces formed on the step supports respectively with their lower edge or with the projections on the front side before creation from its attachment to the step supports, the latter being advantageously guided laterally by means of guide elements formed in the step supports such as, for example, guide ribs.

In another preferred embodiment of the method, the base plates are pushed during assembly on the support surfaces formed in the step supports in the direction of this crossbar, respectively with their limit edge intended to limit with the respective crossbars that form the surface. front of the tribune step above, the latter preferably being guided laterally by means of guiding elements formed in the step supports such as, for example, guide ribs.

Mounting procedures of this type are especially safe and require less effort.

If the base plates are inserted during their mounting in a groove on the front side of this crossbar with their intended limit edge to limit with the respective crossbars that form the front surface of the tribune step located above, which is preferable, they are supported on the crossbar in the area of this limit edge and at the same time they are secured in form drag against lifting.

In another preferred embodiment of the method, during assembly the base plates are secured in a form-driven manner against lifting respectively in the area of their limit with the crossbar that forms the front side of the step formed therewith. This occurs thanks to the fact that a profile contour, which extends along this limit of the respective base plate, fits, by displacing the base plate in its plate plane in the direction of the tribune step located above, in an undercut in the crossbar that forms the front side of the step formed with the base plate.

Furthermore, it is convenient that the joints between the crossbars and the step supports are secured by mounting the base plates against a separation of the joint as a consequence of the removal of the projections outside the housings. In this way, these joints are automatically secured during the assembly of the tribune segment according to the invention.

Brief description of the drawings

Other configurations, advantages and applications of the invention result from the dependent claims and the following description in view of the figures. It is shown in:

FIG. 1 shows a perspective plan view obliquely from above of a three-step tribune segment according to the invention;

FIG. 2 shows a side view of the tribune segment of FIG. 1;

Figure 3 a front view of the tribune segment of figure 1;

Figure 4 a rear view of the tribune segment of figure 1;

Figure 5 a plan view of the tribune segment of figure 1;

Figures 6 to 12 progressively the development in creating the connection between a crossbar and a step support during the assembly of the tribune segment by means of lateral views and vertical sections along the line A-A in Figure 5;

Figures 13 to 16 progressively the development in the insertion of a base plate during the assembly of the rostrum segment by means of vertical sections along the line B-B in Figure 5;

Figure 17 a vertical section along the line B-B in Figure 5 after the assembly of the grandstand seats;

FIG. 18 shows a perspective plan view obliquely from above of one of the step supports of the tribune segment; and

Figure 19 shows a perspective plan view obliquely from above of one of the crossbars of the tribune segment.

Methods for carrying out the invention

Figure 1 shows a three-step tribune segment according to the invention with seats in a perspective top plan view obliquely from above.

As can be seen in combination with Figures 2 to 5, which show a side view (Figure 2), a front view (Figure 3) and a rear view (Figure 4) of rostrum segment 1, as well as a plan view of the tribune segment 1 (Figure 5), the support structure of the tribune segment 1 is formed by two parallel step supports 2 that are joined together by three crossbars 3. In this case, the crossbars 3 respectively form the front sides of the tribune steps and with their ends laterally limit with the step supports 2. The areas formed between the step supports 2 and the crossbars 3 are covered by base plates 4 that form the upper sides of the tribune steps. In the area of their front and rear edges, the base plates 4 are supported on the adjacent crossbars 3 and are also laterally supported on the step supports 2. On the front side of the crossbars 3 tribune seats 13 are respectively fixed by of a support bracket 12.

As can be seen in the representation in combination with Figures 6 to 12, which progressively show the development of the creation of the connection between a crosspiece 3 and a step support 2 during the assembly of the rostrum segment 1 by means of lateral views (Figures 6 and 7) and vertical sections along line AA in figure 5 (figures 10 to 12), and also in the representation in combination with figures 18 and 19, showing perspective representations of a step support 2 (figure 18) and a crosspiece 3 (figure 19) of the tribune segment 1, the joints between the crossbars 3 and the step supports 2 are formed thanks to the button-like projections 5a, 5b that separate from the sides The front of the cross members 3 are housed in housings 6a, 6b formed in the step supports 2, creating a positive connection between the cross members 3 and the step supports 2 in the direction of the force of gravity and in all directions ho horizontal.

As can be seen in Figures 6 to 12, during the assembly of the tribune segment 1, the crossbars 3 are pushed with their lower edge and / or with the lower projections as a button (5a), resting on the support surfaces 8 formed in the step supports 2, up to their mounting position in the step supports 2 (see Figures 6 and 7), these being guided laterally by means of the guide ribs 9 formed in the step supports 2.

The lower button-like projections 5a of the crossbars 3 are then inserted from the front sides of the step supports 2 into the recesses 6a determined for them in the step supports 2 (see FIG. 8). In subsequent steps, the cross members 3 are rotated upwards (figure 9) around the lower projections 5a which are guided in the housings 6a, they are raised (figure 10) and hooked in the housings 6b of the step supports. 2 determined for the projections with the button-like upper projections 5b from the upper sides of the step supports 2 (Figures 11 and 12).

Figures 13 to 16 show, from the mounting state shown in figure 12, progressively the development of the insertion of the base plate 4 by means of vertical sections along the line BB in figure 5.

As can be seen, the base plate 4 with its rear limit edges in front, intended to limit with the crosspiece 3 that forms the front surface of the tribune step located above, is pushed into the bearing surfaces 8 of the step support 2 in the direction of this crosspiece 3, the same being guided laterally by means of the guide ribs 9 (figure 13). Subsequently, the rear limit edge of the base plate 4 is inserted slightly into the groove 7 of the crossbar 3, the height of which corresponds fundamentally to the thickness of the rear limit edge of the base plate 4 (FIG. 14). The lower limit of the groove 7 is located essentially flush with the bearing surfaces 8 formed on the step supports 2, so that the rear limit edge of the base plate 4 automatically enters the groove 7 during movement.

Subsequently, the base plate 4 with its lateral limits is placed on the support surfaces 8 of the step supports 2 and with its front limit edge it is placed on the crossbar 3 that forms the front surface of the tribune step formed with the same . In this case, it overlaps the upper limit edge of this crosspiece 3 (Figure 15) with a profile contour 10 formed in its front limit edge and which extends along this limit edge. Starting from the situation represented in figure 15, the base plate 4 is now pushed further back until its rear limit edge fits into the base of the groove 7 of the crossbar 3 that forms the front surface of the tribune step located above. Here, the profile contour 10 in the front limit edge of the base plate 4 is inserted in an undercut 11 in the crosspiece 3 that forms the front surface of the tribune step formed with it, creating a positive connection to this crosspiece 3 that it acts against a lifting of the base plate 4 in this area (figure 16).

Once the base plates 4 have been assembled, the grandstand seats 13 are fixed to the crossbars 3 with the support brackets 12 assigned to them, whereby the base plates 4 are simultaneously secured in form drag against forward movement. This situation is represented in Figure 17 as a vertical section along line B-B in Figure 5.

The disassembly of the seats 12, 13, of the base plates 4 and of the crossbars 3 is carried out analogously in reverse order, that is to say, like assembly, without tools.

Although preferred embodiments of the invention are described in the present application, it should be clearly stated that the invention is not limited thereto and that it can also be carried out in another way within the scope of the following claims.

Claims (22)

1. Segment of stepped tribune (1) from several structural elements (2, 3, 4) joined together with the possibility of dismantling that comprises two step supports (2) arranged side by side at a distance and joined together through various crossbars (3), as well as base plates (4) that cover the areas formed between the step supports (2) and the crossbars (3), the crossbars (3) respectively forming the front sides of the steps of tribune, limiting its ends laterally with the step supports (2) and penetrating the step supports (2) and the crossbars (3) respectively in the limit zone, forming a positive connection between the crossbar (3) and the step support (2) in the direction of the force of gravity and in all horizontal directions, especially in all transverse directions with respect to the longitudinal extension of the crossbar (3) and in all horizontal directions, configuring the crossbars (3) and the step supports (2) so that the respective connection between them for the mounting of the tribune segment (1) can be created by inserting projections (5a, 5b) formed in the crossbars (3 ) in housings (6a, 6b) formed in the step supports (2) for the projections (5a, 5b) and said connection can be separated for the removal of the tribune segment (1) by removing the projections (5a, 5b) ) of the housings (6a, 6b) in the opposite direction, the crossbars (3) and the step supports (2) being configured so that the connection between them for the mounting of the tribune segment (1) can be created by inserting of the projections (5a, 5b) in the housings (6a, 6b) in a direction transverse to the longitudinal extension of the crossbars (3), penetrating the crossbars (3) respectively with several protrusions (5a, 5b), formed in their respective end, laterally on the corresponding step support and (2), forming the positive connection between the crossbar (3) and the step support (2) in the direction of the force of gravity and in all horizontal directions, especially in all directions transverse to the longitudinal extension of the crossbar (3) and in all horizontal directions, at least two, especially exactly two, protrusions separated from each other (5a, 5b) in a direction transverse to the longitudinal direction of the respective one, forming at the ends of the crossbars (3) respectively crossbar (3), characterized in that the crossbars (3) and the step supports (2) are configured in such a way that for the creation of the respective connection between the crosspiece (3) and the step support (2) for mounting of the tribune segment (1) it is necessary to insert, completely or at least in part, a first projection (5a) of the at least two projections (5a, 5b) in the housing (6a) assigned to it of the step support ( 2) before the inse rtion of a second projection (5b) of the at least two projections (5a, 5b) in the housing (6b) assigned to it of the step support (2), and because the crossbars and the step supports are configured in such a way that the insertion of the first projection (5a) of the at least two projections (5a, 5b) in the housing (6a) assigned to it a) must be carried out from the upper side of the step support before the insertion of the second projection of the at least two projections in the housing assigned to it from the front side of the step support or b) must be carried out from the front side of the respective step support (2) before inserting the second projection (5b) of the at least two projections (5a, 5b) in the housing (6b) assigned to it from the upper side of the step support (2). 2. Tribune segment (1) according to claim 1, each of these projections (5a, 5b) forming a positive connection between the crossbar (3) and the step support (2) pointing outwards from the respective step support (2) in the longitudinal direction of the crossbar (3). 3. Tribune segment (1) according to one of the preceding claims, the cross members and the step supports being configured so that the insertion of the first projection (5a) of the at least two projections (5a, 5b) in the housing (6a ) assigned to it from the front side of the respective step support (2) must be made before inserting the second projection (5b) of the at least two projections (5a, 5b) in the housing (6b) assigned to it from the side upper part of the step support (2) and the at least two projections (5a, 5b) comprising an upper projection (5b) and a lower projection (5a) and the crossbars (3) and the step supports (2) being configured in such a way that the insertion of the lower projection (5a) of the at least two projections (5a, 5b) in the housing (6a) assigned to it from the front side of the step support (2) must be carried out before inserting the upper projection (5b) ) of the at least two projections (5a, 5b) in the housing (6 b) assigned to it from the upper side of the step support (2). 4. Tribune segment (1) according to one of the preceding claims, the cross members (3) and the step supports (2) being configured so that, to insert the projections (5a, 5b) in the housings (6a, 6b) , the cross members (3) must rotate or move during assembly in relation to the step supports (2) respectively around an axis that develops parallel to their longitudinal axis and that they must rotate or move backwards correspondingly during disassembly to remove the projections (5a, 5b) from the housings (6a, 6b). 5. Tribune segment (1) according to one of the preceding claims, the connections between the crossbars (3) and the step supports (2) respectively being secured through the base plates (4) against cancellation of the connection by means of the removal of the projections (5a, 5b) outside the housings (6a, 6b). 6. Tribune segment (1) according to one of the preceding claims, the base plates (4) being secured in a form-fitting manner against lifting by means of this crossbar (3) respectively due to their limit edge which limits with the respective crossbar (3) which forms the front surface of the grandstand step above. 7. Tribune segment (1) according to one of the preceding claims, the base plates (4) being supported by this crossbar (3) respectively due to their limit edge that limits with the respective crossbar (3) that forms the front surface of the step of grandstand located above. 8. Tribune segment (1) according to claim 6 and according to claim 7, the base plates (4) being inserted in a slot (7) on the front side of the crossbar (3) respectively due to their limit edge that limits with this crossbar respective (3) that forms the front surface of the grandstand step located above. 9. Tribune segment (1) according to claim 8, the lower limit of the groove (7) being located, on which the respective base plate (4) rests, essentially flush with the support surfaces (8) formed on the step supports (2) for the lateral areas of the respective base plate (4). 10. Platform segment (1) according to claim 9, the bearing surfaces (8) formed on the step supports (2) being limited laterally by guide elements (9), especially by guide ribs (9) for the lateral guiding of the respective base plate (4) during placement on these support surfaces (8) and during insertion into the slot (7) of the respective crossbar (3). Tribune segment (1) according to one of the preceding claims, the base plates (4) being supported by the crossbar (3) respectively in the area of its limit with the crossbar (3) that forms the front side of the step formed with the same. 12. Tribune segment (1) according to one of the preceding claims, the base plates (4) being secured in form drag against a lifting by the crossbar (3) respectively in the area of its limit with the crossbar (3) that forms the front side of the step formed with them. 13. Platform segment (1) according to claim 12, fitting the base plates (4), respectively in the area of their limit with the crossbar (3) that forms the front side of the step formed with them, with a contour of profile (10) that extends along this limit, in an undercut (11) in this crossbar (3), creating a positive union against a lifting of the base plate (4) in this area and especially configuring the base plates (4) and the crossbars (3) respectively so that, in the absence or removal of any fixing device (12), the respective base plate (4) can move in its plate plane to separate the joint positive and so that the fit of the profile contour (10) of the base plate in the undercut (11) of the crossbar (3) is annulled. 14. Tribune segment (1) according to claim 13, the base plates (4) being secured in a form-driven manner by the functional components of the tribune, especially by the components (12) of the tribune seats (12, 13), against a displacement that would result in a nullification of the positive union against a lift. 15. Tribune segment (1) according to one of the preceding claims, the connections between the step supports (2) and the crossbars (3) being able to be created without tools and being able to cancel them without tools and especially not being necessary additional components to creating these unions. 16. Tribune comprising several tribune segments (1) according to one of the preceding claims, the tribune segments (1), arranged next to each other, presenting common step elements (2). 17. Procedure for mounting a tribune segment (1) according to one of claims 1 to 15, comprising the steps: a) provision of two step supports (2) arranged side by side at a distance; b) provision of several crossbars (3) to join the step supports (2); c) union of the two step supports (2) by means of the crossbars (3) forming a common support structure, creating the connections between the crossbars (3) and the step supports (2) thanks to the fact that the projections (5a, 5b) formed in the crossbars (3) are inserted, in a direction transverse to the longitudinal extension of the crossbars (3 ), in the housings (6a, 6b) formed in the step supports (2) for the projections (5a, 5b), whereby the crossbars (3) are arranged between the step supports (2) and creating a connection positive between the crossbars (3) and the step supports (2) in the direction of the force of gravity and in all horizontal directions, especially in all directions transverse to the longitudinal extension of the crossbar (3) and in all directions horizontal, creating the joints between the crossbars (3) and the step supports (2) thanks to the fact that the projections (5a, 5b), which separate from the front sides of the crossbars (3) in their longitudinal direction, are inserted , in a transverse direction to the extent longitudinal fastening of the cross members (3), in housings (6a, 6b) formed in the step supports (2) for the projections (5a, 5b), characterized in that the cross members have on their front sides, respectively, an upper projection (5b) and a lower projection (5a) and being inserted, for the connection of the respective crossbar (3) to the two step supports (2) a) respectively first of all the upper projections, from the upper side of the step support, in the housings assigned to these projections in the step supports and then turning or moving the cross members around an axis that develops parallel to its axis longitudinal and the lower projections being inserted from the front side of the step supports in the housings assigned to these projections in the step supports, or b) respectively firstly inserting the lower projections (5a) from the front side of the step supports (2) in the housings (6a) assigned to these projections (5a) in the step supports (2) and turning or moving the cross members (3) then around an axis that develops parallel to its longitudinal axis of the cross member (3) and the upper projections (5b) being inserted from the upper side of the step supports (2) in the housings (6b) assigned to these projections (5b) on the step supports (2). 18. Method according to claim 17, during mounting the cross members (3) being pushed, before creating their connection to the step supports (2), respectively with their lower edge and / or with their projections on the front side ( 5a) leaning on the support surfaces (8) formed on the step supports (2), up to their mounting position on the step supports (2), these being guided especially laterally by means of guide elements (9) , especially guide ribs (9), formed in the step supports (2). 19. Method according to one of claims 17 to 18, the base plates (4) being pushed during assembly respectively with their limit edge, intended to limit with the respective crossbar (3) that forms the front surface of the tribune step located above, on the support surfaces (8) formed in the step supports (2), in the direction of this crossbar (3), these being guided especially laterally by means of guide elements (9), especially guide ribs (9) , formed on the step supports (2). Method according to one of claims 17 to 19, the base plates (4) being pushed during assembly respectively with their limit edge, intended to limit with the respective crossbar (3) that forms the front surface of the tribune step located above, in a groove (7) on the front side of this crossbar (3), whereby they rest on this crossbar (3) in the area of this limit edge and are secured in form drag against lifting. The method according to one of claims 17 to 20, the base plates (4) being fitted during assembly respectively in the area of their limit with the crossbar (3), which forms the front side of the step formed with them, with a profile contour (10) that extends along this limit, by displacing the base plate (4) in its plate plane in the direction of the rostrum step above, in an undercut (11) in this crossbar ( 3), with which they are ensured in form drag against a lifting in the area of this limit. 22. Method according to one of claims 17 to 21, the connections between the crossbars (3) and the step supports (2) being secured, respectively by mounting the base plates (4), against cancellation of the connection by removing the projections (5a, 5b) from the housings (6a, 6b).