FR2946373A1 - Module for device to permit access between two levels i.e. staircase, of building site, has side stair stringer extending on lower side of steps away from side edges and following axis parallel to and away from another axis - Google Patents

Module for device to permit access between two levels i.e. staircase, of building site, has side stair stringer extending on lower side of steps away from side edges and following axis parallel to and away from another axis Download PDF

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Publication number
FR2946373A1
FR2946373A1 FR0902718A FR0902718A FR2946373A1 FR 2946373 A1 FR2946373 A1 FR 2946373A1 FR 0902718 A FR0902718 A FR 0902718A FR 0902718 A FR0902718 A FR 0902718A FR 2946373 A1 FR2946373 A1 FR 2946373A1
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module
fixed
lower
steps
stringer
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FR0902718A
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French (fr)
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FR2946373B1 (en
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Yann Danset
Eric Beauquesne
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ANOXA
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ANOXA
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F11/00Stairways, ramps, or like structures; Balustrades; Handrails
    • E04F11/02Stairways; Layouts thereof
    • E04F11/022Stairways; Layouts thereof characterised by the supporting structure
    • E04F11/025Stairways having stringers
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR OTHER BUILDING AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G27/00Temporary arrangements for giving access from one level to another for men or vehicles, e.g. steps, ramps
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR OTHER BUILDING AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G5/00Component parts or accessories for scaffolds
    • E04G5/10Steps or ladders specially adapted for scaffolds
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR OTHER BUILDING AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G5/00Component parts or accessories for scaffolds
    • E04G5/14Railings

Abstract

Module (1) for a device (2) for access between two levels (3, 4), especially a worksite staircase, comprising a lower silt (12) and a lateral stringer (13) parallel to the lower stringer (12), both slats (12, 13) connecting steps (7), a step comprising, a heel (9) and two lateral edges (10), each step (7) being pivotally mounted on the one hand on the lower stringer (12) following a first axis extending along the heel (9), said stringer (12) extending from a lower side of the steps (7), away from the lateral edges (10), and secondly on the stringer (13) lateral along a second axis parallel to and away from the first axis.

Description

Module for access device between two levels and device comprising such a module

The invention relates to access means between two levels, for example stairs, and more particularly the invention relates to the field of temporary stairs, such as those installed on construction sites. The staircase is commonly set up on a construction site to move from one level to another. It includes steps, arranged parallel to the ground, superimposed and offset. The steps are mounted on one or more strings solidarisant. The silts can be placed on either side of the steps or under the steps. The standard NF P93-521, relating to construction equipment, distinguishes between ladder and staircase. Thus, the staircase has an inclination angle of between 30 ° and 45 °, while the scale has an inclination angle of between 45 ° and 50 °. In general, the staircase is fixed at the place where it will be used, for example between two successive stages. However, the construction stairway must be removed at the end of the project. Thus, we find stairs of construction site as well on the ground as on the scaffoldings. In France, the conditions that stairways must meet in workplaces, particularly on construction sites, are given in the Labor Code. Thus, the article R.4216-12 specifies certain dimensions for the steps of the stairs, while the article R.4534-84 indicates that the stairs must be provided if not a ramp, at least of guardrails and skirting boards. The French standard NF P93-521 and the European standard EN 12811-1 also give dimension values of the stairs. The NF E85-015 standard also specifies the conditions that site stairs must meet as permanent means of access in the field. It is difficult to predict the conditions on a construction site. This is why the stairs must be able to adapt easily to the constraints of the ground on which they will be mounted.

To this end, it has been proposed stairs with adjustable slope, so that the height reached by the stairs can be adjusted. A009 8001 EN - patent project # 5 tqd Document DE 32 03 164 shows an example of a staircase with an adjustable slope. The steps are mounted pivoting on a slime placed under the steps. A system makes it possible to ensure relative parallelism between the steps and the ground. In addition, the lower part of the staircase includes a telescopic leg to adapt the height of the stairs. The use of an ancillary system to block the steps parallel to the ground increases the weight of the staircase, the number of rooms and the costs. The document FR 2 726 021 describes a stairway with an adjustable slope by a deformable parallelogram system. For this purpose, the steps are pivotally mounted on two parallel stringers placed on either side of the steps. On each side of the steps, a baluster is fixed on the step and joins a handrail parallel to the stringers, so that all the steps are parallel. Thus, when a step is blocked in a substantially horizontal position, all the steps are horizontal. A jack fixed between the staircase and a vertical mast of a support makes it possible to maintain fixed the slope of the staircase. Alternatively, the steps can be pivotally mounted on each of their edge between two parallel strings so as to form a deformable parallelogram. GB 2 426 029 and JP 4-83050 provide examples of such stairs. The stairs are then fixed on their lower and upper parts to block the slope. The deformable parallelogram system is used because it does not require additional parts. However, it requires to adjust at least one step parallel to the ground so that the other steps are also. In GB 2 426 029 and JP 4-83050, this adjustment is achieved by blocking the silt on the ground so as to obtain steps parallel to the ground. It is then difficult to adjust the slope of the staircase again. GB 2 428 729 and 2 432 623 describe stairs with deformable parallelogram comprising a base on the ground, all of the steps being parallel to the base. This realization assumes that the ground is flat, and if necessary requires earthworks. A009 B001 EN - patent project # 5 tqd The heights to be reached by stairs are generally of the order of several meters so that the stairs pose transport and storage problems. In addition, the fact of adjusting the slope of the staircase does not allow to obtain variations in the height of the staircase of the order of one meter, so that beyond a certain height, it is necessary to change stairs. To reduce the size of the stairs, US 6,981,572 proposes a staircase in two parts pivotally mounted relative to each other, so that the staircase can be folded in half. However, although such a staircase reduces congestion, its height and slope are fixed, reducing its adaptability. The document FR 2 680 533 describes a staircase in which the steps are individual and assembled to each other as required, for storing the steps in the form of a stack. US 4,406,347 discloses a staircase whose steps and strings are in parts. Once the staircase is assembled, the slope is adjustable by a deformable parallelogram system connecting the two strings. However, the assembly of such stairs is long and tedious. In addition, although transport and storage are easier than for an already assembled staircase, the multiplication of parts can lead to inventory management problems and increase costs.

It is known to use stairs formed from assembled modules following the needs, in particular to form stairs adapting to a curved wall. Thus, a module comprising steps supported by deformable strands placed on either side of the steps is abutted to another module, so that the strings follow each other. The silts of two butted modules are then slightly curved and fixed to each other so that the staircase best follows the curvature of the wall. Documents US 4,143,740 and US 4,355,700 show examples of stairs in modules. These examples of staircase modules are mainly used to be installed in homes, and therefore do not meet the requirements, in particular normative, stairs of construction sites. A US $ 6,415,891 discloses a linear staircase for scaffolding assembled from modules. Each module comprises in a lower part a horizontal member and in the upper part a fastening member in the form of a hook. Thus, the upper part of a module is hooked on the horizontal member of the next module, the first step of a module being found in support on the last step of the other module, to constitute the staircase according to the height desired. GB 2 428 729 and GB 2 432 623 show another example of a staircase for scaffolding. The staircase includes steps supported by two stringers placed on either side of the steps tangentially to the nose and the heel of the steps. The staircase further comprises a pedestal parallel to the steps on which are mounted pivoting the lower ends of the stringers, so as to obtain a staircase with adjustable slope by the deformable parallelogram system. Thus, when the base is fixed to the ground, all the steps are parallel to the ground as well. On their upper end, the slats tangent to the heel of the steps are provided with a hook coming to rest against a tube, for example a horizontal tube of a scaffolding or a subsequent staircase. However, the higher the height of the stairs, the greater the number of modules and therefore the greater the weight of the stairs. Therefore, the constraints that the links between the modules must support impose a limit to the height achievable by the stairs. Indeed, the stairs in module presented above do not fully meet the requirements of standards such as those provided by French standards NF P93-521 and NF E85-015. In particular, the connection between the modules by means of a hook does not make it possible to obtain a sufficiently rigid structure to withstand the load stresses. Furthermore, these examples of staircase modules do not allow to simply ensure the parallelism between the steps of all the modules and the ground.

The present invention aims in particular to provide a solution to the various problems mentioned above. A first object of the invention is to propose a temporary staircase formed from several modules, rigid enough to reach a height of several meters of adjustable slope. A second object of the invention is to provide a temporary staircase formed from several easily transportable and storable modules. A third object of the invention is to provide a temporary staircase that can be mounted and disassembled without damaging nearby facilities.

A fourth object of the invention is to provide a temporary staircase formed from several modules using a minimum of parts for mounting. A fifth object of the invention is to provide a temporary staircase formed from several modules adaptable to the terrain.

For this purpose, the invention proposes, in a first aspect, a module for an access device between two levels, in particular a worksite staircase, which comprises a lower stringer and a lateral stringer parallel to the lower stringer. The two strings connect steps, a step with a heel and two side edges, each step being pivotally mounted on the lower stringer along a first axis extending along the heel, the lower stringer extending from a lower side of the steps, away from the side edges, and secondly, the steps being pivotally mounted on the lateral stringer along a second axis parallel to and at a distance from the first axis.

The module thus formed then has a slope adjustable by the deformable parallelogram system while offering a resistance to the load complies with standards. The lower stringer comprises two parallel uprights on which the steps are pivotally mounted. Similarly, the lateral stringer comprises two uprights placed on either side of the steps against the side edges, the steps being pivotally mounted between said amounts of the lateral stringer. Advantageously, the module comprises a railing, comprising two parallel posts fixed perpendicular to the steps and a handrail pivoting on the posts and parallel to the stringers. The A009 B001 FR - patent project # 5 tqd guardrail can then deform depending on the module to fit the slope. Preferably, a last step of the module comprises two rails parallel to the side edges and fixed on the lower side of the step, to cooperate with an upper fastening system. The upper attachment system comprises a bracket adapted to be fixed between the last step of the module and a higher level, and includes arms adapted to engage in the rails of the last step. Thus, by setting the bracket so that the arms are projected parallel to a horizontal surface of the upper level, the last step is positioned substantially parallel to this surface. The set of steps of the module is then parallel to this surface thanks to the deformable parallelogram system. Support means comprise a support arm adapted to be fixed on the lower stringer of a first module, the arm being pivoted on a plate adapted to be fixed at the lower level. These means further comprise a foot adapted to be adjustable and fixed between a first step of the first module and a plate adapted to be fixed at the lower level. The support means can follow the slope of the module through the pivoting arms. Advantageously, the adjustable foot comprises a threaded rod which, on the one hand, is fixed on the plate adapted to be fixed at the lower level, and which, on the other hand, cooperates with a setting nut, said nut being fixed to a adjustable soleplate that can be attached to the first step of the module. The adjustable foot can then in particular absorb some of the parallelism defects between the steps of the module due to mounting games. According to a second aspect, the invention proposes an access device between two levels, in particular a temporary staircase for a building site, comprising two modules as described above, the modules being assembled by means of a connecting element fixed on the stringer. lower of the two modules. The bond on the silt ensures in particular to obtain a resistance meeting the requirements of the standards. The coupling member may include an insertion member attaching to the lower stringer uprights. The coupling element advantageously extends under a connection between a step and the uprights of a first module and the connection between a step and the amounts of the lower silt of a first module. second module, thus providing greater rigidity when the steps are loaded. The support means on a lower level described above are preferably attached to a first step of a first module, while the upper attachment system is fixed to a last step of a last module, so that the device is fixed on both levels, reducing the risk of accidental dismantling. Other objects and advantages of the invention will become apparent in the light of the description given below with reference to the accompanying drawings in which Figure 1 is a perspective view of a module and two guardrails; Figure 2 is a front view of the single module of Figure 1; Figure 3 is a bottom perspective view of the module of Figure 2; Figure 4 is a perspective view of a coupling member, the insertion member and the reinforcing member being separated; Fig. 5 is a side view of the coupling member of Fig. 4, in which the insertion member and the reinforcing member are assembled; Figure 6 is a top view of the connector member of Figure 3; Figure 7 is a perspective view of the coupling member of Figure 3; Figure 8 is a bottom view of two unassembled modules and a coupling member; Figure 9 is a side view of the modules and the connecting member of Figure 6; Figure 10 is a side view of a staircase assembled from two modules and fixed between an upper level and a lower level; Figure 11 is a perspective view of the stair of Figure 8; Figure 12 is a front view of the stair of Figure 8; A009 8001 EN - Patent Project # 5 tqd Figure 13 is a rear view of the staircase of Figure 8; Figure 14 is a perspective view of an upper fastening system, a step and a block modeling the upper level, these elements are not assembled; Fig. 15 is a bottom perspective view in which the elements of Fig. 12 are assembled; Figure 16 is a detail view of Figure 8; Figure 17 is a perspective view of an arm on a plate for attachment to the lower level; Figure 18 is a perspective view of a height adjustable foot; Figure 19 is a perspective view of the two uprights of a lower stringer according to one embodiment and a frame carrying lifting rings; Figure 20 is a perspective view of a staircase having the frame of Figure 19 assembled on the amounts of the lower stringer. In Figure 1 is shown a module 1 to form a device 2 access between a lower level 3 and an upper level 4. In the following description, the upper, horizontal and vertical lower terms will be used for convenience without implying a limitation in orientation. However, it is understood that these terms refer to the orientation of the figures, the modules 1 and the staircase 2 being placed between a lower level 3 and an upper level 4, the upper level 4 being vertically offset from the lower level 3 . The device 2 is particularly applicable in the field of building stairs. The staircase 2 is preferably made of metal, for example aluminum alloy or steel, such as galvanized steel, stainless steel. The module 1 comprises a lower end portion 5 and an upper end portion 6 between which steps 7 are arranged. A step 7 is defined by a leading edge 8 called nose parallel to a bottom edge 9 called a heel. The nose 8 and the heel 9 are connected by two lateral edges, the step 7 forming a rectangular element, of which an upper face 11 is preferably provided with means for reducing the risk of slipping. These means may for example comprise a non-slip coating. The upper face 11 and the nose 8 can be made of expanded metal, perforated sheet. Alternatively, the upper face 11 is slatted. Preferably, the upper surface 11 is perforated so as to avoid accumulation of rain or snow. Advantageously, the module 1 comprises five steps 7. The distance between the heel 9 of the steps 7 is preferably constant.

A first step 7a of the module 1 is then defined as being the step closest to the lower extreme part of the module 1, that is to say the first step that a person reaches by climbing the steps 7. Similarly, , a last step 7b of the module 1 is defined as being the step closest to the upper extreme part 6 of the module 1, that is to say the last step that a person reaches by climbing the steps 7. The steps 7 are supported by two strings 12, 13. A lower stringer 12 extends under the steps 7, that is to say on the opposite side to the upper face 11 of the steps 7. The lower stringer 12 extends in a substantially central region of the steps, that is to say, it is equidistant from the side edges. The lower silt 12 comprises two parallel uprights 14 placed at a distance from the lateral edges and pivotally mounted on each step 7 along a first axis extending along the heel 9 of the steps 7.

For this purpose, the first axis is in the form of a rod fixed along the heel 9 of the steps 1. Each step 7 comprises three sleeves 9 'fixed along the heel 9 and at a distance from each other, so that to define two spacings. Sleeves 14 'are distributed and fixed on the uprights 14 of the lower stringer 12, so that a sleeve 14' of a first upright 14 is aligned with a sleeve 14 'of the second upright 14. Two sleeves 14' aligned amounts 14 are inserted in the spacings between the three sleeves 9 'of a step 7, and the rod is inserted into the sleeves 14' aligned uprights 14 and step. Fasteners at the ends of the rod ensure locking in translation. A009 8001 EN - patent project # 5 tqd The uprights 14 of the lower silt 12 are further connected by two transverse bars, fixed to the uprights 14 at a distance from their ends. Preferably, the transverse bars are situated between the connection between the first step 7a of the module 1 and the lower stringer 12 and the connection between the last step 7b of the module 1 and the stringer 12 below. Preferably, each amount 14 of the lower stringer 12 extends beyond the heel 9 of the first step 7a of the module, but does not exceed the heel of the last step 7b.

The uprights 14 of the lower stringer 12 comprise support legs 16 projecting away from the steps 7 and whose function will be explained later. Each upright 14 comprises two legs 16 distributed along the length of the upright 14. A lateral stringer 13 connects the lateral edges of the steps 7.

The lateral stringer 13 comprises two uprights 17 parallel to each other and to the uprights 14 of the lower stringer 12, and which are placed on either side of the steps 7 on the lateral edges. Each step 7 is pivotally mounted between the uprights 17 of the lateral stringer 13, along a second axis parallel to the nose 8 and the heel 9, this axis being at a distance from the first pivot axis of the lower stringer 12. The second axis emerges from the lateral edges of each side of the step 7 and is locked in translation at each of its ends on either side of the step 7 against the uprights 17 of the lateral stringer 13.

The position of the fasteners of the lower and lateral slats 12 on the steps 7 is identical for all the steps 7. The steps 7 thus form with the strings 12, 13 a deformable parallelogram system, ensuring the parallelism between all the steps 7 of module 1.

In addition, thanks to this assembly, it is possible to replace a step 7 without touching the other steps 7. Thus, the second axis is unlocked from the amounts 17 of the limon 1 side, so that the step 7 is free of the 13 side slime . Then the rod 9 'of the first axis is disengaged from the sleeves of the step 7 and the uprights 14 of the lower silt 12. The step 7 can be removed and a new step 7 can be mounted by performing reverse operations. Advantageously, the first step 7a and the last step 7b comprise two sleeves 18a, 18b respectively fixed on a lateral edge of the steps 7a, 7b, perpendicular to the upper face 11 of the steps 7. The sleeves 18a fixed on the first step 7a have a generally conical shape, while the sleeves fixed on the last step 7b have a straight shape. The module 1 further comprises on each side of the steps 7 a guard 19. Each guard 19 comprises a lower rail 20, a top rail 21 and an intermediate rail 22 placed between the upper and lower rails 20. The three smooth 20, 21, 22 are pivotally mounted on two poles 23, 24 parallel of the same length. The height of attachment of each rail 20, 21, 22 on a first post 23 is equal to the height of attachment on the second post 24, so that the rails 20, 21, 22 are all parallel to each other. The railing 19 thus also forms a deformable parallelogram system. The two posts 23, 24 are attached to the first and last steps 7a, 7b. For this purpose, the lower end of the first pole 23 is inserted and fixed in a sleeve 18a conical on the first step 7a and the lower end of the second pole 24 is inserted and fixed in a sleeve 18b right on the last step 7b, the two posts 23, 24 being placed on one side of the steps 7. The conical sleeve 18a facilitates the mounting of the posts 23, 24 allowing a beat, while the second post 24 is fixed in the sleeve 18b right. Advantageously, the height between the nose 8 of the steps 7 and the rails 20, 21, 22 is constant, so that the rails 20, 21, 22 are parallel to the stringers 12, 13. Advantageously, the bottom rail 20 is flush with the nose 8 steps, slightly protruding to form a foot guard or plinth. The top rail 21 covers the upper end of the posts 23, 24, so as to have a smooth surface forming a handrail Thus, the adjustment of the inclination of the module 1 jointly causes the adjustment of the slope of the railings 19 following the silts 12, 13. A009 8001 EN - project patent # 5 tqd Two modules 1 are assembled by means of a connecting element 25 solidarizing the lower stringers 12 of the two modules 1. The coupling element 25 comprises an element 26 insertion and a reinforcement piece 27.

The insertion member 26 comprises two longitudinal sleeves 28 and connected at their ends to their inner longitudinal edge 29 by two transverse sleeves 30. Each longitudinal sheath 28 comprises an open U-shaped section, provided with a folded portion 31 at 180 ° outwards along an outer longitudinal edge 32, bringing rigidity to the sheath 28. The two longitudinal sheaths 28 have their opening 33 placed on the same side 34 of the upper connecting element. As will be seen below, the longitudinal sleeves 28 are spaced apart by a distance substantially equal to the distance between the uprights 14 of the lower stringer 12.

Each transverse sleeve comprises an open U-shaped section folded outwardly along an edge to form a fin 35 on the upper 34 side. The two transverse sleeves 30 have their opening 36 directed away from each other and shifted by 90 ° relative to the opening 33 of the sleeves 28 longitudinal.

The reinforcement part 27 comprises two longitudinal sections 37 each fixed to a longitudinal sleeve 28 in a median region 38 of the sleeve 28, and two transversal sections 39 connecting the longitudinal sections 37. The reinforcement part 27 makes it possible to stiffen the coupling element 25.

Thus, each longitudinal sheath 28 defines two receiving zones 40 on either side of the median region 38. The length of the receiving zones 40 is substantially equal to the distance between the end of the uprights 14 of the lower stringer 12 and the transverse bar closest to the end.

The modules 1 are then assembled as follows. Two modules 1 are placed in a substantially flat position in which the steps 7 form a minimum angle with the stringers 12, 13, the value of the minimum angle being for example of the order of 10 °. The modules 1 are placed on the support legs 16 of the lower silt 12, so as to leave a space accessible under the steps. A coupling element 25 is hooked on a first module 1. For this purpose, the uprights 14 of the lower silt 12 of the first module 1 are inserted into a first zone 40 for receiving the longitudinal sleeves 28. by their opening 33 against a lower face of the uprights 14, until the uprights 14 abut against the longitudinal section 37 of the reinforcing member 27. The opening 33 of the longitudinal sleeves 28 is then turned towards the steps 7, so that the sleeves 28 longitudinal can beyond the heel 9 of the first step 7a, without interfering with the connection between the first step 7a and the lower stringer 12. At the same time, the fin 35 of a first transverse sleeve 30 guides a transverse bar of the lower stringer 12 to the bottom of said sleeve 30, so that the coupling element 25 is positioned on the first module 1.

The second module 1 is likewise slid on the coupling element 25. The uprights 14 of the lower stringer 12 of the second module 1 are then respectively in the second zone 40 for receiving the longitudinal sleeves 28, abutting against the reinforcing member 27, and a transverse bar 14 of the lower stringer 12 is guided to the bottom of the second transverse sheath. As for the first module 1, the longitudinal sleeves 28 extend beyond the heel 9 of the last step 7b, without impeding the connection between the last step 7b and the lower silt 12. The hook member 25 thus hung is not yet attached to the modules 1 but simply thanks to the transverse sleeves 30 on the transverse bars 14 of the lower stringers 12. The modules 1 being slightly elevated thanks to the feet 16, it is possible to fix the connecting element 25 on the modules 1, for example by means of screws.

The posts 17 of the lateral stringers 13 of each module 1 can be fixed together by means of a connecting plate 41. Thus, a first end of the connecting plate 41 is pivotally mounted on a post 17 of the stringer 13 of a module 1 in order to be folded against the module 1 during transport. The second end of the connecting plate 41 is then attached to another module A009 8001 FR - patent project # 5 tqd 1 at the end of the upright 17 of the lateral stringer, ensuring the junction between the deformable parallelograms of the two modules 1. Advantageously , the handrails 21 of the two modules 1 are also fixed together in the extension of one another, by means of a coupling sleeve 21 ', slid and fixed under the handrails 21 of two modules. The handrails thus have a smooth continuous upper surface. The staircase shown in FIGS. 8 to 11 comprises two modules 1. However, other modules 1 can be assembled to the two preceding modules 1 in the same way. In practice, we can butt up to five modules 1 so as to form a flight of twenty-five steps, in accordance with the rules in force. Once the modules 1 assembled, the staircase 2 thus formed can be set up on a site such as a construction site and fixed.

For this purpose, the staircase 2 comprises on a last module 1b means for being fixed at the upper level 4 and comprises on a first module 1a means for being fixed at the lower level 3. The first module 1a and the last module 1b are defined substantially identically to the first step 7a and the last step 7b: the first module 1a is the module that a person ascending the staircase reaches first, the last module 1 b being the module that person then reaches last. The last step 7b of the last module 1b comprises two rails 42 parallel to the borders (10) side, fixed under the last step 25 7b A system 43 of upper attachment comprises a bracket 44 formed by two walls 45, 46 perpendicular, a wall 45 long and a shorter wall 46. The right angle between the two walls 45, 46 can be reinforced by means of stiffeners 47 fixed between the two walls 45, 46. Two arms 48 are fixed on an inner face 49 of the long wall 45 and project perpendicular to the 45 long wall. The end 50 of the arms 48 is bent. An axis 51 is fixed on the bracket 44, parallel to the edge between the two walls 45, 46. On either side of the bracket 44, two flanges 52 are pivotally mounted on said axis 51 of the angle 44. A009 B001 EN - project patent # 5 tqd The last step 7b of the last module 1b is fixed to the upper mounting system 43 in the following manner. The arms 48 of the fixing system 43 are placed in the rails 42 under the last step 7b, the curved end 50 of the arms 48 bearing against the nose 8 of the last step 7b to position the system 43. The arms 48 are then fixed for example by means of screws inserted into coaxial openings of the arms 48 and rails 42. Thus, the last step 7b is found perpendicular to the long wall 45 of the bracket 44. Preferably, the last step 7b is applied against the end of the short wall 46, to be substantially aligned with the short wall 46, and form a continuous flat bearing. The outer face 53 of the long wall 45 is then positioned in abutment against a substantially vertical surface 54 of the upper level 4, the short wall 46 being placed at best to be in line with a substantially horizontal surface 55 of the upper level 4. The pivoting flanges 52 are pivotally fitted to bear on the substantially horizontal surface 55 and be attached thereto.

The adjustment of the flanges 52 makes it possible to absorb part of the flatness defects of the upper level 4. The upper attachment system 43 requires the last step 7b of the last module 1b to be substantially parallel to the horizontal surface 55 of the upper level 4. Thanks to the deformable parallelogram system, the connecting element and the connecting plate 41, all the steps 7 of the staircase are also parallel to the horizontal surface 55. Advantageously, each module 1 is provided on its last step 7b of rails 42 adapted to be fixed on arms 48 of an upper mounting system 43 so that each module 1 can be used alone or as an upper module 7b of a flight of 'staircase. The modules 1 are then advantageously identical. In addition, the first module la may include support means on the lower level 3. For this purpose, on the lower end portion of the first module 1a, a support arm 56 is attached to each lower limon 12. The support arm 56 comprises a first portion 56a secured to a second portion 56b forming an angle with the first portion 56a. The first portion 56a is inserted into the uprights 14 of the lower silt 12. The second portion 56b is also pivotally mounted on a plate 57 along an axis parallel to the plate 57. The first step 7a of the first module 1a further comprises means for compensating for horizontal defects of the steps 7. For this purpose the first step 7a of the first module rests on two adjustable feet 58, aligned along an axis parallel to the nose 8 of the step 7a and homogeneously distributed. Each adjustable foot 58 comprises a soleplate 59 fixed to a nut 60, which nut 60 cooperates with a threaded rod 61 fixed perpendicularly to a plate 62. A setting nut 63 is fixed to the base of the threaded rod 61 against the plate 62. The soleplate 59 is fixed under the first step 7a of the first module, against the nose 8 of the step 7a. The first module 1 is then fixed at the lower level 3 by joining the plates 57 on which the support arms 56 are pivoted with a substantially horizontal surface 64, for example by means of screws inserted into holes 64 on the plates 57. Adjustable foot adjustment nut 63 is pivoted, for example by means of a key, driving the threaded rod 61, varying the height between the adjustment soleplate 59 and the plate 62 and thus between the plate 62 and the first step 7a. Adjustable feet 58 thus make it possible in particular to make up for any defects in parallelism between the steps 7 due to the functional clearances and to absorb part of the flatness defects of the lower level. Once the height is set, the plate 62 of each leg 58 is fixed on the lower level 3. The staircase 2 thus formed can be adapted to several heights as required, both thanks to the adjustable slope and to the assembly of modules 1. The connecting element 25 ensures a constant distance between the steps 7 of the In addition, the connecting element 25 makes it possible to obtain the same angle of inclination between the set of modules 1. A009 8001 EN - patent project # 5 tqd Preferably, the staircase 2 is mounted before being brought to a site such as a construction site. Thus, the modules 1 with the railings are assembled for example in the factory. The upper attachment system 43 is attached to the last module 1b, and the arms 56 and adjustable feet 58 are attached to the first module 1a. The staircase 2 is then transported flat to the site. Before the assembly of the staircase 2, all the modules 1 are identical, limiting the problems of stock management. Furthermore, the staircase 2 may be provided with fixing plates 65, fixed between the transverse sections 39 of the reinforcing pieces 27. Each plate 65 comprises two parallel wings 66, projected opposite the opening 33 of the longitudinal sleeves 28 of the insertion element 26. The wings 66 comprise holes 67. Thus, additional means of fixing the staircase 2 can be inserted into the holes 67 of the wings 66. In particular, a telescopic prop resting on the lower level 3 can be hung between the wings 66 of the fixing plates 65 and fixed so as to form an additional support for the staircase 2, limiting the bending deformation of the lower stringers 12 when the staircase 2 is loaded.

According to one embodiment, the staircase comprises means for being put in place on a construction site between two levels 3, 4. These means comprise for example two pairs 68, 69 of lifting rings. Advantageously, a first pair 68 is carried by the last module 1b of the staircase, for example on the upper attachment system 43. The second pair 69 is then advantageously carried by the first module 1a. For this purpose, each upright 14 of the lower stringer 12 of the first module 7a is integral with a groove 70. A U-shaped frame 71 on which is fixed the second pair 69 of rings has its parallel branches 72 inserted in a gutter 70 of the lower silt 12. Then the frame 71 is fixed in the gutters 70. Lifting means can then be fixed on the two pairs 68, 69 rings to lift the stairs 2. The fasteners between the two levels 3, 4 of the stairs 2 decrease the risks that the staircase 2 is accidentally detached, for example in the event of vibrations caused by the environment, for example by wind or by vibrations of the ground. A009 8001 EN - patent project # 5 tqd In addition, the staircase 2 has sufficient strength for a flight of twenty-five steps 7 to meet the load constraints required on a building site. In particular, thanks to the deformable parallelogram system between the strings 12, 13 and the steps 7 of the modules, the parallelism between the steps 7 of all the modules 1 is guaranteed. In addition, the upper attachment system 43 makes it possible to impose the parallelism between a step and the horizontal surface 55 of the upper level 4, so that all the steps are horizontal.

Finally, the horizontal defects that may occur between the last step 7b of the last module lb fixed at the upper level 4 and the first step 7a of the first module attached to the lower level 3, defects for example due to the functional play during assembly modules 1 and the mounting steps 7 on the strings 12, 13 are absorbed at least partially by the adjustable feet 58. The staircase 2 thus formed from the modules 1 can then take an inclination of between 30 ° and 45 ° depending on the height to be achieved. The simple assembly allows a single operator to assemble the modules for installation on a construction site.

The lower stringer 12 makes it possible to support the steps 7, so as to increase the bending strength of the steps 7. Thus, in accordance with the requirements of the standards ISO 14122-3 and NF E85-015, the step steps 7 are ie the free width on a step 7 to circulate, can reach 800mm while meeting the requirements of resistance to stresses. The assembly of the steps 7 on a lower stringer 12 and the small size of the lateral stringer 13 also make it possible to fix the posts 23, 24 of the guardrails 19 on the lateral edges of the steps 7, so that the step corresponds to the distance between the lateral edges of the steps 7, A009 B001 FR - patent project # 5 tqd

Claims (12)

  1. REVENDICATIONS1. Module (1) for a device (2) for access between two levels (3, 4), especially a worksite staircase, comprising a lower silt (12) and a lateral stringer (13) parallel to the lower stringer (12), both slats (12, 13) connecting steps (7), a step comprising a heel (9) and two lateral edges (10), each step (7) being pivotally mounted on the lower stringer (12) first axis extending along the heel (9), said stringer (12) extending from a lower side of the steps (7), away from the lateral edges (10), and secondly on the stringer ( 13) along a second axis parallel to and away from the first axis.
  2. 2. Module (1) according to claim 1, wherein the lower stringer (12) comprises two parallel uprights (14) on which the steps (7) are pivotally mounted, and wherein the stringer (13) comprises two lateral amounts ( 17) placed on either side of the steps (7) against the edges (10) side, the steps (7) being pivotally mounted between said uprights (17) of the stringer (13) side.
  3. 3. Module (1) according to claim 1 or 2, comprising a railing, the railing comprising two parallel posts (23, 24) fixed perpendicularly to the steps (7) and a handrail (21) pivoting on the posts ( 23, 24) and parallel to the stringers (12, 13).
  4. 4. Module (1) according to one of claims 1 to 3, wherein a last step (7b) comprises two rails (42) parallel to the edges (10) side and fixed on the underside of the step (7b).
  5. 5. upper fastening system for module (1) according to claim 4, the fixing system (43) comprising a bracket (44) adapted to be fixed between a last step (7b) of the module (1) and a level (4). ), and comprises arms (48) adapted to engage in the rails (42) of the last step (7b).
  6. 6. Supporting means on a lower level (3) for module (1) according to one of claims 1 to 4, said means comprising a support arm (56) adapted to be fixed on the lower stringer (12), the arm (56) being pivotable on a plate (57) adapted to be fixed at the lower level (3), and these means further comprising a foot (58) capable of being fixed between a first step (7a) of the module (1) and a plate (62) adapted to be fixed at the lower level (3).
  7. 7. Supporting means according to claim 6, wherein the adjustable foot (58) comprises a threaded rod (61) which, on the one hand, is fixed on the plate (62) adapted to be fixed at (3) lower, and which, on the other hand, cooperates with an adjusting nut (63), said nut (63) being fixed to a setting pad (59) adapted to be fixed to the first step (7a) of the module (1). ).
  8. 8. Device (2) for access between two levels, including a temporary staircase for building site, comprising two modules (1) according to one of claims 1 to 4, the modules (1) being assembled by means of an element (25). ) of connection fixed on the lower stringer (12) of the two modules (1).
  9. Access device (2) according to claim 8, wherein the connecting element (25) comprises an insertion element (26) which is fixed on uprights (14) of the lower stringer (12).
  10. 10. Device (2) for access according to claim 9, wherein the connecting element (25) extends under a connection between a step (7) and the uprights (14) of the lower silt (12) of a first module (1) and the connection between a step (7) and the uprights (14) of the lower stringer (12) of a second module (1).
  11. 11. Device (2) for access according to one of claims 8 to 10, comprising support means on a lower level (3) according to claim 6 or 7, said means being fixed to a first step 1 (7a ) of a first module (la).
  12. 12. Device (2) for access according to one of claims 8 to 11 comprising an upper fixing system (43) attached to a last step (7b) of a last module (1 b). A009 B001 FR - patent project # 5 tqd
FR0902718A 2009-06-05 2009-06-05 Module for access device between two levels and device comprising such a module Active FR2946373B1 (en)

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527834A (en) * 1946-03-12 1950-10-31 John L Mcglothlen Stepladder
US3593821A (en) * 1969-12-22 1971-07-20 Unit Step Farm Co Inc Adjustable stairstep unit
FR2195999A5 (en) * 1972-08-11 1974-03-08 Sainsaulieu Den S
US4998982A (en) * 1988-12-16 1991-03-12 Arnold William F Metal ladder construction with reinforced side rails
WO2000037752A1 (en) * 1998-12-18 2000-06-29 Otte, Fritz Reusable staircase
GB2355735A (en) * 1999-10-04 2001-05-02 Kennedy Jack Metal Prod Adjustable stairway for use with an overcast in a mine
GB2424442A (en) * 2005-03-22 2006-09-27 David John Head Ramp forming attachment for a plank
GB2425324A (en) * 2005-04-22 2006-10-25 Robert David Black Ladder with treads maintained in horizontal position
GB2428729A (en) * 2005-06-27 2007-02-07 Acorn Corporate Services Ltd A scaffold stair unit
WO2007043892A1 (en) * 2005-10-13 2007-04-19 Sb Produksjon As Joining system and use of this system
AU2008252032A1 (en) * 1997-06-23 2009-01-29 Australian Project Specialists Pty Ltd Collapsible Stairway
WO2009017417A1 (en) * 2007-08-01 2009-02-05 Svein Berg Holding As Joining system for two building elements

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527834A (en) * 1946-03-12 1950-10-31 John L Mcglothlen Stepladder
US3593821A (en) * 1969-12-22 1971-07-20 Unit Step Farm Co Inc Adjustable stairstep unit
FR2195999A5 (en) * 1972-08-11 1974-03-08 Sainsaulieu Den S
US4998982A (en) * 1988-12-16 1991-03-12 Arnold William F Metal ladder construction with reinforced side rails
AU2008252032A1 (en) * 1997-06-23 2009-01-29 Australian Project Specialists Pty Ltd Collapsible Stairway
WO2000037752A1 (en) * 1998-12-18 2000-06-29 Otte, Fritz Reusable staircase
GB2355735A (en) * 1999-10-04 2001-05-02 Kennedy Jack Metal Prod Adjustable stairway for use with an overcast in a mine
GB2424442A (en) * 2005-03-22 2006-09-27 David John Head Ramp forming attachment for a plank
GB2425324A (en) * 2005-04-22 2006-10-25 Robert David Black Ladder with treads maintained in horizontal position
GB2428729A (en) * 2005-06-27 2007-02-07 Acorn Corporate Services Ltd A scaffold stair unit
WO2007043892A1 (en) * 2005-10-13 2007-04-19 Sb Produksjon As Joining system and use of this system
WO2009017417A1 (en) * 2007-08-01 2009-02-05 Svein Berg Holding As Joining system for two building elements

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