EP1362150B1 - Scaffolding frame for a system scaffold - Google Patents

Description

TECHNICAL AREA

The present invention relates to a scaffolding frame for a system scaffold with two parallel spaced vertical scaffolding bars, which are connected on the upper side with a U-shaped cross bar and the underside with a cross bar, wherein welded to the front scaffolding bar inside two spaced apart in the longitudinal direction of the scaffold bar receiving devices for connecting railing bars are and a scaffolding frame with connecting devices for balusters.

STATE OF THE ART

From the general building inspectorate approval Z-8.1-16.2 "Layher Lightning Scaffold System 70 Steel" of February 02, 1998, Appendix A, page 10, of the German Institute for Construction Technology is known a scaffolding frame, which has been proven in practice for decades. In this case, a connection device for balusters is used, which is designed as a so-called inner box and is welded directly to the vertical stem of the vertical frame. In the upwardly open connection device correspondingly shaped end portions of balusters are introduced from both sides and then clamped by striking a wedge clamped in the inner box. The inner box can be mass produced inexpensively as a serial component.

The connection of balusters is, in accordance with the applicable regulations, remote from the structure to be equipped Exterior of the scaffolding required. If the wall distance between the framework and the component to be fitted, that is on the inside of the scaffolding, is more than 30 cm (centimeters), the relevant regulations stipulate that either consoles or additional internal guardrails have to be arranged. The arrangement of additional inner railings is required in each case in the assembly of wall units in steel construction halls, since the steelworks initially form no "wall" between the support structures, creating an additional backup of the scaffolding fitters towards the inside of the scaffold, that is towards the building to be equipped, is required.

In order to enable in such framework situations in the known system scaffold a possibility for the connection of balusters on the inside of the frame, a special component is used, in which the connecting device is welded to a wedge coupling. The wedge coupling is by means of a wedge clamped on the vertical handle fastened. During assembly, this means an increased amount of work, which requires additional time, with the problem that when turning the wedge for clamping fixing the coupling on the scaffold stem, the entire connecting device can rotate about the longitudinal axis of the scaffold stem, so additional readjustment work is required. At the same time, the height at which the connection device must be fastened is not exactly predetermined and must be adjusted each time the connection device is mounted. This significantly increases the time and effort during assembly. Since the special component encloses the scaffold post on all sides, a "glide through the hand" during assembly or disassembly is not possible, which slows the disassembly or assembly speed.

From the US 4,140,414 A is known a connection device for a vertical scaffolding bar, which allows the connection of a further scaffolding rod perpendicular to the vertical scaffold bar. For this purpose, the vertical scaffolding rod has recesses into which a hammer-head-like protrusion unit of the connecting device can be threaded, the bracing of the connecting device on the vertical scaffold rod being effected by striking a slotted wedge between the outer wall of the vertical scaffold rod and the connecting device. The connecting device further comprises a rotatable profile unit, on which the further scaffolding rod can be plugged and connected via a bolt.

Due to the rotatability of the connection, the connection angle of the other scaffolding bar can be varied, so that a structure with a wide variety of circumferential contours can be scaffolded.

The US 4,430,019 A also discloses a connecting device for scaffolding bars, in which a hammer head unit can be inserted in a form-fitting manner behind engaging in a groove of a vertical scaffold bar, which is then clamped by means of a wedge. On the inside protruding, the connection device has a bolt, can be pushed onto the connected framework diagonals via a corresponding recess and connected to it.

The FR 2 604 758 A1 discloses a connection device for a vertical scaffolding rod, which has a hammer-head-like projection unit, which can be threaded behind the recess in a vertical rod, then then arranged on the connecting body of the connecting device from above a right angle to the vertical rod Horizontal bar with U-shaped downwards open profile attached and secured with a split pin.

The GB 1 092 202 A discloses a connection device which has in its one end region a ring eyelet for connecting further rods and in the opposite end region has a projection unit which can be inserted through corresponding recesses of a vertical framework rod and secured in the opposite end region by pulling a split pin.

The DE 197 11 496 A1 discloses a facade scaffold with successively arranged and interconnected by transverse struts in certain vertical distances vertical supports consisting of individual elements, wherein for stiffening purposes diagonal supports are provided. In this case, at least one end of the diagonal supports is arranged engaging by means of a hook in an opening provided in the associated vertical support.

PRESENTATION OF THE INVENTION

Based on the cited prior art, the present invention, the object or the technical problem of specifying a scaffolding frame for a system framework, which avoids the disadvantages shown in the prior art, can be produced economically, the labor and time required during assembly or Disassembly significantly reduced and ensures a durable and reliable function.

The scaffolding frame according to the invention is given by the features of independent claim 1. advantageous Embodiments and further developments are the subject of the dependent claims.

The scaffolding frame according to the invention for a system scaffold with two parallel spaced vertical scaffolding bars, which are connected on the upper side with a cross bar and the underside with a cross bar, wherein on the front scaffolding bar inside two spaced apart in the longitudinal direction of the scaffold bar receiving devices for connecting railing rods are welded, characterized accordingly from that the opposite rear scaffolding bar inside two in the longitudinal direction of the scaffold bar spaced as recesses formed recesses, the slots are each at about the same height level as the opposite receiving means of the front scaffolding bar, extend in the rod longitudinal direction and in each of the recesses Projection unit of a connecting device for releasably connecting railing rods form-fitting and / or non-positively releasably connectable or connected.

A particularly advantageous development is characterized in that the connection device has a receiving device for releasably connecting a railing rod and a connection device for detachable connection to the scaffolding frame and the connection device has the projection unit which forms in a recess provided on the scaffold pole or scaffolding. or non-positively releasably connectable,

A particularly advantageous embodiment is characterized in that the projection unit is formed like a hammer head, such that it is present in the existing on the scaffold pole or scaffolding frame recess is inserted and engages by rotation, the inner wall of the scaffold bar or scaffolding frame.

The recess is formed as a slot.

Starting from the previously produced in mass production indoor box for connecting railing bars, a particularly advantageous development is characterized in that attached to the scaffold bar or scaffolding frame side of the connecting device a base plate, in particular welded, is, on which the projection unit is arranged. The base plate and the projection unit are preferably integrally formed as a casting.

In order to ensure a permanently reliable function, a particularly advantageous embodiment is characterized in that an anti-rotation device is provided which secures the connecting device against rotation in the connected state, wherein the anti-rotation device as further on the scaffold stick or scaffolding frame side facing, in particular on Base plate, arranged knobs or projection elements is formed, whose projection length is formed so that adjusts a click or snap effect during rotation of the connection device and in the connected state, the knobs or projection elements abut the outer wall of the trained as a round tube cross-railing railing or scaffolding frame.

Thus, a locking of the connection device in the assembled state can be reliably ensured permanently, a development is characterized in that the projection length is chosen so large that the rotation of the connection device can be performed only with the aid of a striking tool or lever tool.

The scaffolding frame according to the invention with elongated holes for connecting devices offers the following advantages in contrast to the known scaffolding frame with connecting devices with a wedge coupling element:
The workload and time required for assembly is significantly reduced. A rotation of the connecting device about the longitudinal axis during fixing is not given because the turning of a wedge for connecting a wedge coupling element is eliminated. In addition, a clear fixation in height is guaranteed. An especially great advantage in terms of assembly technology is that a scaffolding frame or scaffolding frame with mounted connection device can slide in the hand of the installer, in particular during disassembly, which is not possible in the known connection device, since this surrounds the scaffolding rod or the handle of a scaffolding frame completely circumferentially. Another advantage is that the connection device ensures a simple throwing and trapping process due to its compact design and light weight, namely because such connection devices are thrown upwards during assembly by an assembly person located in the lower area and vice versa.

Its lightweight and compact design minimizes packaging and packaging issues. Another big advantage is that Scaffolding frames, which have a mounted connection device can be easily stacked in the known stacking devices for such elements, without the connection device must be dismantled, which is not possible in connected connection devices according to the prior art due to its voluminous structure.

Overall, the scaffolding frame according to the invention represents a significant improvement of a scaffold system that requires additional handrails on the inside.

Further embodiments and advantages of the invention will become apparent from the features further listed in the claims as well as by the embodiments given below. The features of the claims may be combined in any manner as far as they are not obviously mutually exclusive.

BRIEF DESCRIPTION OF THE DRAWING

Fig. 1

schematische Detailperspektivdarstellung eines an sich bekannten Gerüstsystems aus Bestandteilen des Layher-Blitz-Gerüstsystems unter Einsatz von Anschlussvorrichtungen für Geländerstäbe auf der Innenseite des Gerüstsystems, letztere in auseinandergezogener Darstellung,

Fig. 2

schematische Detailperspektive einer Anschlussvorrichtung mit Grundplatte und Vorsprungeinheit,

Fig. 3

a und b stark schematisierte Darstellung des Anschlusses einer Anschlusseinrichtung an einen Geländerstab in nicht montierter Position (Fig. 3a) und in montierter Position (Fig. 3b),

Fig. 4

schematische Seitenansicht des Verbindungsbereiches einer Anschlussvorrichtung mit einem Vertikalstab in montierter Position, wobei ein Geländerstab aus Übersichtlichkeitsgründen in herausgezogener Position dargestellt ist, und

Fig. 5

schematische Draufsicht auf die Darstellung gemäß Fig. 4.

The invention and advantageous embodiments and developments thereof are described in more detail below with reference to the examples shown in the drawing and explained. The features to be taken from the description and the drawings may be applied individually or in combination in any combination according to the claims. Show it:

Fig. 1

schematic detail perspective view of a known scaffolding system made of components of the Layher flash scaffold system using connection devices for balusters on the inside of the scaffold system, the latter in an exploded view,

Fig. 2

schematic detail perspective of a connection device with base plate and projection unit,

Fig. 3

a and b highly schematic representation of the connection of a connection device to a railing bar in unassembled position ( Fig. 3a ) and in mounted position ( Fig. 3b )

Fig. 4

schematic side view of the connection region of a connecting device with a vertical rod in the mounted position, wherein a baluster is shown in the pulled-out position for clarity, and

Fig. 5

schematic plan view of the illustration according to Fig. 4 ,

WAYS FOR CARRYING OUT THE INVENTION

At the in FIG. 1 In a detail perspective shown section of a scaffolding system 50 is seen from its basic structure from her to the known flash scaffold system of the applicant.

A framework field is basically constructed of two scaffolding frames 18 arranged at a distance from one another in the longitudinal direction, which have vertical scaffolding bars 19 spaced apart in the transverse direction. The scaffold bars 19 are on the upper side connected to a U-shaped cross bar 28, wherein in the corner region between the cross bar 28 and the vertical bar 19 each have a gusset plate 30 is welded. In the lower end region, the vertical bars 19 are connected to a transverse bar 32.

The scaffold bars 19 have the upper side in FIG. 1 Not shown projecting plug-in areas with a relation to the outer diameter in the rod area smaller outside diameter, such that the scaffolding frames 18 are stacked. In the framework of the frame facing away from the building, that is in the in FIG. 1 the viewer facing the front area two receiving devices 12.1 are welded to each front scaffolding bar 19 on the inside, which serve to connect railing rods 14.

In the cross bar 28 of the scaffolding frame 18 pads 34 are mounted from above. The stiffening of the framework in the longitudinal direction takes over a diagonal bar 36, which according to the Presentation in FIG. 1 in the front gusset plate 30 of the right scaffolding frame 18 is positively threaded into a recess. In the other end of the diagonal bar 36 this is connected via a not-shown Keilrohrkupplung in the lower region of the front scaffolding bar 19 of the left scaffolding frame 18.

The structure is such that initially two scaffolding frames 18 are either placed on spindles or put on already existing scaffolding frames 18. Following this, the railing bar (s) 14 are mounted. Then the pads 34 are hooked and finally the diagonal 36 connected.

In some cases, it may happen that additional railing posts must be arranged on the inside of the scaffold 50 facing the structure to be equipped, for example if the distance to the component to be fitted is greater than 30 cm (centimeters) or if there is no "wall" of the structure to be equipped, for example, in the case of installation of wall elements for steel structures.

To create a connection option, the in FIG. 1 Rear scaffolding bar 19 of the scaffolding frame 18 in the appropriate required height spaced two recesses 24 which are formed as slots. In each of these recesses 24, a connection device 10 is releasably connectable, which will be described below.

The connecting device 10 has a receiving device 12 which is identical to the known receiving device 12.1 and which can already be economically produced as a large-scale part. At the recording device 12 is a sliding wedge 38 is provided, which serves to jam the terminal portions of the balusters 14. For this purpose, the railing rods 14 each have in their end region a downwardly facing, flat projection 40 which can be inserted from above into the receiving device. The geometry of the receiving device 12 is selected in the exemplary embodiment so that a projection 40 of a railing rod 14 can be introduced from two sides. In the wedge 38 is an elongated recess 52, within which runs transversely to a mounted in the receiving device 12 bolt 54. As a result, the wedge 38 is displaceable in the direction of the recess 52 and can be hammered by hammer blow or reversed dissolved.

The novelty of the connection device 10 consists in the fact that a base plate 22 is connected by means of welds to the receptacle device 12, which is known per se as a mass-produced component, on the outside of the receptacle 12 facing the connection region of the framework rod 19, to which in turn an outwardly protruding projection unit 20 is formed is, which is designed hammerhead-shaped. The base plate 22 and the projection unit 20 are formed as a one-piece casting and form a connection device 16 for easy connection to a railing rod.

In each corner region of the base plate 22 further projection elements 26.1 are formed with a projection length V, which form an anti-rotation device 26 when mounted connection device 10.

The hammer head of the projection unit 20 has a width BV and a thickness T.

For connecting the connecting device 10 to the scaffold bar 19, this has in the correspondingly required height a slot 24 extending in the longitudinal direction of the bar and having the length LA and the width BA. The length LA and the width BA of the slot 24 are dimensioned such that the hammer head of the projection unit 20 can be passed through the recess 24.

The assembly of the connection device 10 takes place in a very simple manner and is in the FIGS. 3a and 3b shown schematically. First, the connection device with respect to the position of use is rotated by 90 ° (old degree). In this position, the projection unit 20 can be inserted into the recess 24 (arrow E). After insertion of the projection unit 20, the connection device 10 is rotated by 90 ° (Degree) (arrow D), so that the hammer head of the projection unit 20 engages behind the inner wall of the framework rod 19.

The projection elements 26.1 take over in the end position rotated connection device 10, the function of a rotation. The projection length V is chosen so that upon rotation (D) of the connecting device 10, a resistor is first constructed. Once this resistance is overcome, "snaps" the connecting device 10 in its end position (90 ° rotated), wherein the outer sides of the projection elements 26.1 abut the circular cross-sectionally curved outer wall of the scaffolding rod 19. In this case, the projection length V is preferably chosen so that in order to overcome the resistance against rotation, a lever tool, such as a lathe hammer, must be used and twisting by hand is not possible.

Claims (9)

1. Scaffolding frame (18) for a system scaffold having:

   - two vertical scaffolding bars (19) which are arranged spaced apart in parallel,

   - which are connected on the upper side to a u-shaped crossmember (28) and on the lower side to a crossbar,

   - wherein two receiving means which are spaced apart in the longitudinal direction of the scaffolding bar (19) and intended for the connection of railing bars (14) are welded to the front scaffolding bar (19) on the inner side,

   characterized in that the opposite rear scaffolding bar (19) has, on the inner side, two cutouts (24) which are formed as slots and which are spaced apart in the longitudinal direction of the scaffolding bar, wherein the slots are each situated approximately at the same height level as the receiving means of the front scaffolding bar (19) which are situated opposite thereto, and extend in the bar longitudinal direction, and the projection unit (20) of a connection device (10) can be or is releasably connected in each of the cutouts (24) in a form- and/or force-fitting manner for the releasable connection of railing bars (14).
2. Scaffolding frame according to Claim 1, characterized in that

   - the connection device (10) has a receiving means (12) for the releasable connection of a railing bar (14), and a connection means (16) for releasable connection to the scaffolding frame (18), and

   - the connection means (16) has the projection unit (20) which is releasably connected in a form- and/or force-fitting manner in the cutout (24) present on the scaffolding bar (19) of the scaffolding frame (18) .
3. Scaffolding frame according to Claim 2, characterized in that the projection unit (20) is of hammerhead-like design in such a way that it can be inserted into the cutout (24) present on the scaffolding bar (19) or scaffolding frame (18) and, by means of rotation, engages behind the inner wall of the scaffolding bar (19) or scaffolding frame (18).
4. Scaffolding frame according to Claim 2 or 3, characterized in that a base plate (22), on which the projection unit (20) is arranged, is fastened, in particular welded, on the side of the connection means (10) that faces the scaffolding bar (19) of the scaffolding frame (18).
5. Scaffolding frame according to Claim 4, characterized in that the base plate (22) and the projection unit (20) are formed in one piece as a cast part.
6. Scaffolding frame according to one or more of Claims 2 to 5,
   characterized in that an anti-rotation safeguard means (26) is present which secures the connection device against rotation in the connected state.
7. Scaffolding frame according to Claim 6,
   characterized in that the anti-rotation safeguard means (26) takes the form of further protuberances or projection elements (26.1) which are arranged on the side facing the scaffolding bar (19) of the scaffolding frame (18), in particular on the base plate (22), and the projection length (V) of which is designed such that a click or snap effect is produced upon rotation of the connection device (10), and, in the connected state, the protuberances or projection elements (26.1) bear against the outer wall of the railing bar (19), which is designed as a round tube cross section, of the scaffolding frame (18).
8. Scaffolding frame according to Claim 7,
   characterized in that the projection length (V) is chosen such that the connection device (10) can be rotated only with the aid of a lever tool or striking tool.
9. Scaffolding frame according to Claim 2,
   characterized in that the railing bar (14) is connected within the receiving means (12) by wedging.

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