CA2909214A1

CA2909214A1 - Truss girder for a weather protection roof as well as weather protection roof with several truss girders

Info

Publication number: CA2909214A1
Application number: CA2909214A
Authority: CA
Inventors: Melanie Maier; Christian Leder; Jurgen Kurth; Bernd RUCHTI
Original assignee: Peri GmbH
Current assignee: Peri SE
Priority date: 2013-04-12
Filing date: 2014-04-09
Publication date: 2014-10-16
Anticipated expiration: 2034-04-09
Also published as: CN105189889A; EP2984255A1; CA2909214C; RU2618814C1; WO2014167015A1; CN105189889B; DE102013206583A1; EP2984255B1

Abstract

The present invention concerns a truss girder for receiving a protective tarpaulin of a weather protection roof serving as a roof membrane, to which an assembly rail accessible to an installation worker is fitted.

Description

TRUSS GIRDER FOR A WEATHER PROTECTION ROOF AS WELL AS
WEATHER PROTECTION ROOF WITH SEVERAL TRUSS GIRDERS
The present invention concerns a truss girder for receiving a protective tarpaulin of a weather protection roof serving as a roof membrane as well as such a weather protection roof, the truss girders of which are designed according to the invention.
Weather protection roofs are for example used in newly constructed buildings during adverse weather conditions or during "ongoing" renovation work as a temporary roof to prevent the ingress of rain and/or sun radiation into an existing building or the building site when the own roof of the building has for example been removed or is being renovated. Such a weather protection roof usually consists of a multitude of truss girders, of which each defines a disc in a static sense.
Individual truss girders are normally arranged at distances from each other like rafters of a pitched roof in the direction of the ridge, and are connected with each other in pairs in the area of the ridge to form trussed rafters that straddle the building to be protected. The truss girders therefore in effect form a roof timbering that serves for receiving a protective tarpaulin with the function of a roof membrane, which is often secured to adjacent truss girders by means of a piping connection with such weather protection roofs, in that piping incorporated into the edge areas of the protective tarpaulin is threaded into piping rails in the upper straps of the truss girders.
During the installation of such weather protection roofs the usual approach is to pre-assemble the truss girders from individual framework elements and/or members on the ground and to then connect them with each other in the ridge area according to the desired roof pitch, which will usually be of a magnitude of around 15 . Although the static height of individual truss girders is only about 0.7 to 1.5 m the ridge point of two truss girders connected with each other at such an angle of incline can lie at a height of several metres, so that subsequent installation work, such as for example the installation of the piping rail or the affixing of the crane hook for lifting the truss girder construction, can be carried out only with personal protective equipment (PSE) for safety reasons, as an installation worker must climb onto the trussed rafter erected on the ground from two truss girders to carry out this installation work. Installation workers must usually secure themselves to the truss girders with the aid of personal protective equipment for all other installation work to be carried out after lifting the individual trussed rafters onto or above a building to be protected, such as for example the installation of purlins connecting the trussed rafters, the threading of the protective tarpaulin into the piping rail, or the detaching or affixing of

2 crane slings as part of the installation or disassembly of the roof.
It can also happen, for example during the supply of construction material, that a part of the weather protection roof will for example have to be opened by removing parts of the protective tarpaulin and displacing the framework connectors. Once again it is essential here that workers within the area of the trussed rafters are present and active, for which they will normally have to secure themselves with the aid of the personal protective equipment.
As a consequence of all this, work to be carried out in the area of the weather protection roof will take some time and will therefore incur not insubstantial costs, not to mention the risk of falling despite the use of personal protective equipment.
It is therefore the purpose of the invention to simplify the work to be carried out in the area of a weather protection roof, and in particular simplify scaffolding work to be carried out during the installation and disassembly of a weather protection roof whilst reducing the risk of falling at the same time.
According to one aspect of the invention this task is solved by a truss girder for receiving a protective tarpaulin of a weather protection roof serving as a roof membrane with the characteristics of claim I.
Wherever a truss girder is mentioned in context herein, this should be understood as a planar framework construction consisting of individual framework members, whereby individual framework members extend along a common level and form a disc in the shape of the truss girder in question in an assembled condition in the static sense. Where a trussed rafter is mentioned, however, this should be understood as a framework construction assembled from two truss girders, the two truss girders of which are connected with each other at a common ridge point at a defined angle of incline, such as for example approx. 15 . Two of these framework members are normally pre-assembled on the ground and stiffened by means of two stiffening elements, such as for example purlins, extending between the same, thus forming a spatial framework or a spatial framework member.
As already explained above, individual truss girders of a weather protection roof are assembled from individual framework elements and/or members on the ground. During this pre-assembly of individual truss girders it is now envisaged according to the invention that an assembly rail is removably fitted to the same, at least in part, during the assembly of the truss girders on the

3 ground. All installation and disassembly work following the connection of such truss girders equipped with an assembly rail will then be required at one common ridge point of a trussed rafter, and can be carried out by an installation worker under the protection of the assembly rail. As the assembly rail extends in a longitudinal direction along the truss girder the installation worker can move freely along the truss girder whilst carrying out the necessary work under the protection of the assembly rail, so that personal protective equipment, with which he would otherwise have to secure himself whilst climbing along the truss girders, is not required.
As installation workers can therefore move freely along the assembly rail without being restricted in their movement by protective equipment that would otherwise be required, installation and disassembly work can be completed quickly, which means that acquisition costs incurred for the assembly rail will be redeemed within a short period of time.
Preferred embodiments of the invention will now be described in detail, whereby further embodiments also result from the dependent claims and the drawings.
Although the assembly rail can for example be suspended from the truss girder and in particular extend below the beam of the truss girder, it will nevertheless be of advantage due to the static height of the truss girder that cannot be disregarded, if the assembly rail flanks the truss girder in a longitudinal direction at the side, whereby the surface elements forming the actual running surface of the assembly rail lie on supports mounted on the truss girder at distances from each other in a longitudinal direction of the same, and extend substantially vertical to the level defined by the truss girder. The assembly rail can therefore for example extend at the level of the lower strap along the longitudinal direction of the truss girder, so that an installation worker using the assembly rail can carry out installation work at a static height of the truss girder from about 1.5 m without effort in the area of the upper strap, such as for example the installation of the piping rail for the protective tarpaulin of the weather protection roof.
It would for example also be possible to suspend the support on which the individual surface elements of the assembly rail lie from the upper strap of the truss girder, or from cantilevers extending from the same, with the aid of chains, ropes or tie rods. As such suspensions do however diagonally cross the clearance gauge above the assembly rail, or at least reduce the free clearance height, and would therefore restrict the freedom of movement of the installation worker, it is envisaged according to another embodiment that the support on which the individual surface elements lie is designed as cantilevers projecting substantially freely from the framework level, and can then for example be connected to the lower strap of the truss girder via a rigid connector

4 for transmitting corresponding cantilever torques.
As relatively large torsional torques would be introduced into the lower strap in this way, for which the lower strap is normally not designed, it is envisaged according to a further embodiment that the cantilevers receiving the surface elements are anchored to a support construction that is removably fixed to the framework members of the truss girder, via which the transverse forces originating from the assembly rail and the torques loads can be reliably transferred to the truss girder. It is in particular envisaged with this embodiment that each of the support constructions can comprise posts extending along the framework level, which is preferably telescopic. The foot end of the post in question can here be formed by a kind of claw or as a two-pronged fork, on which the post can stand at the side of a vertical framework member on the lower strap of the framework in that the foot-side claw straddles the lower strap. At the opposite end the post can however comprise anchors lying on the framework level on both sides, for example in the form of claws or two-pronged forks, with which the support construction can be anchored to the adjacent vertical or diagonal framework members.
The fact that the posts comprise two of the anchors in question at their head end, which lie on the opposite sides of the posts of the support construction on the framework level, enable the installation of the support construction in a longitudinal direction of the truss girder in the same place, irrespective of whether the assembly rail is to flank the truss girder on its right or left side.
Altogether the support construction is therefore constructed in a mirror-symmetrical way, making it possible that one and the same support structure can be used for rails to be located both on the right as well as the left of the truss girder.
The post construction explained above is also of advantage in that substantially horizontally extending bolts can be removably hooked onto the post in question, so that a railing element is formed along the side of the assembly rail facing the truss girder, which offers additional security.
According to a further embodiment it is envisaged that the assembly rail is also delimited at the side along the side facing away from the truss girder by means of railing elements, which are for example rigidly formed at the posts connected at the free ends of the cantilevers receiving the surface elements and form removably affixed bolts on these posts. An installation worker present on the assembly rail is therefore protected against falling on one side by the truss girder, and on the opposite side of the assembly rail by the railing located there, whereby a corresponding railing element can also be envisaged along the side of the assembly rail facing the truss girder in accordance with the above explanations in order to minimise the risk of falling further.

Although an installation worker can reach almost any location along the relevant truss girder of a weather protection roof via the assembly rail, the installation worker will have to walk relatively long distances in order to, for example, be able to carry out installation work in the ridge area of adjacent trussed rafters of a weather protection roof, as he will have to walk from the ridge point of one trussed rafter along the assembly rail back to where the same lies on a scaffold or a building wall, in order to reach the adjacent trussed rafters along the assembly rail of the latter. In order to be able to simplify and accelerate installation work still further it is therefore envisaged according to a further embodiment that at least two adjacent truss girders are connected with each other via an assembly rail accessible by an installation worker, which can preferably also be delimited on both sides by railing elements and extend along the ridge of the weather protection roof.
The invention will now be described by way of an example with reference to the enclosed drawings, whereby:
Fig. 1 shows a perspective overview of a weather protection roof according to the invention without protective tarpaulins;
Fig. 2 shows a perspective illustration of two trussed rafters of the weather protection roof of Fig. 1, stiffening each other;
Fig. 3 shows an enlarged illustration of Fig. 2 in the area of the ridge;
Fig. 4 shows a first console type for receiving the installation rail; and Fig. 5 shows a second console type for receiving the assembly rail in the ridge area.
Fig. 1 shows a perspective illustration of a weather protection roof 10 prior to the installation of protective tarpaulin serving as a roof membrane. The weather protection roof 10 illustrated substantially consists of four trussed rafters 14 arranged a distances from and extending parallel to each other, of which each consists of two truss girders 12 connected with each other in the area of the ridge 16. In the embodiment shown, two trussed rafters 14 each are stiffened in pairs by stiffening elements extending between the same, such as for example purlins 18, hooked into rosettes 22 for this purpose, which are located on the framework posts 24 of the truss girder 12. In this way a spatial framework or a trussed rafter is formed by means of two adjacent trussed rafters 14 each. The spatial trussed rafters formed in this way including their protective tarpaulin are pre-assembled on the ground and then lifted over a building to be protected (not shown) by means of a crane. The tarpaulin between two of these spatial trussed rafters can however be installed only once the spatial trussed rafters in question have been brought into position over a building to be protected.
The weather protection roof 10 is mounted on opposing sides of support scaffolds 20 in the embodiment illustrated, between which a building to be protected against environmental influences during renovation work by the weather protection roof 10 or a building site to be protected can for example be located, which is not shown here.
According to the invention it is now envisaged that an assembly rail 26 accessible to an installation worker is fitted to or provided on each truss girder 12, the same extending in a longitudinal direction of the truss girder 12 or the trussed rafter 14 consisting of two truss girders 12, along the lower strap 28 as shown in Fig. I for the second trussed rafter 14 from the left, and recognisable in the corresponding enlarged illustration in Fig. 2, to allow an installation worker safe access to any points of the truss girders 12 of the weather protection roof 10 during pre-assembly work as well as during the installation period illustrated in Fig. 1.
The running surface of the assembly rail 26 is here formed by conventional scaffolding surface elements 30 lying on cantilevers 32 at their opposing facing sides or hooked into these cantilevers 32 with corresponding hooks, removably fitted to the framework members of the truss girders 12 in form of the framework posts 24 or the framework diagonals 36 as well as the beam 28 via corresponding support structures 34. The construction of cantilevers 32 and support structure 34 together can be described as a console, whereby a first console type 38 is illustrated in Fig. 4 and a second console type 40 is illustrated in Fig. 5.
The console 40 illustrated in Fig. 5 here serves for fitting the assembly rail 26 in the area of the ridge 16 of the trussed rafter 14, whilst the console 38 illustrated in Fig. 4 serves for fitting the assembly rail 26 along the remaining areas of the trussed rafter 14, and in particular for fitting the support structure 34 to the framework posts 24.
The two consoles 38, 40 illustrated in Figs. 4 and 5 each comprise a substantially horizontally extending cantilever 32, whereby the cantilever 32 of console 40 illustrated in Fig. 5 is supported by a pressure diagonal 42, so that, strictly speaking, it does not consist of a cantilever, but a single-span beam that can nevertheless be called a cantilever because of its orientation extending from the framework level, especially as the supporting diagonal 42 could also be omitted.
The cantilevers 32 of the relevant console 38, 40 are here rigidly connected to a support structure at their end opposite the freely projecting end, with which the assembly rail 26 can be hooked into the framework members 24, 28, 36.
Each of these support structures 34 here comprise a vertical post 44, whereby the post 44 of the support structure 34 of the console 40 illustrated in Fig. 5 is designed telescopically, which will be explained in more detail below. The foot end of the relevant post 44 is here formed by an anchor in the shape of, for example, a type of claw or two-pronged fork 46, whilst a crossbar 48 is rigidly affixed at the opposite head end of the post 44, at the free ends of which anchors in the shape of claws or two-pronged forks 50 are also affixed, whereby the orientation of these claw-like anchors 50 is however different for both console types 38, 40.
As can be seen from the summary of Figs. 3 and 4 the assembly rail 26 is anchored to the framework post 24 in the area of the same and to the lower strap 28 in that the console 38 forms the foot point of the post 44 with the claw-like anchor 46 on which the lower strap 28 is located, namely in such a way that the foot-side claw 46 straddles the lower strap 28 and the framework post 24 is taken up from behind by one of the claw-like anchors 50 of the crossbar 48. Transverse forces and torque loads originating from the assembly rail 26 can therefore be reliably transferred to the truss girder 12 via the support structure 34, as the lever effect of the post 44 transmits the cantilever torque from the assembly rail 26 to the framework post 24 in the form of a transverse force.
To ensure that the console 38 cannot unintentionally become disconnected again, for example due to dynamic loads, the post 44 further comprises two cantilever arms 52 extending parallel to the crossbar 48 at approximately half height, at the free ends of which a spigot 54 that can be wedged in is envisaged, with which the support structure 34 can be secured to the rosette 22 of the adjacent framework post 24.
The mounting of the assembly rail 26 by means of the console 40 illustrated in Fig. 5 in the area of the ridge 16 is realised in that the foot of the same is first placed on the ridge clamp 56 with its claw-like anchor 46, which as such also forms a part of the beam 28 of the trussed rafter 24. The telescopic post 44 is then extended upward and secured to the framework diagonals 36 of the two truss girders 12 connected with each other in the ridge area by means of anchor claws 50 located on the crossbar 48, in that a safety mandrel 58 is pushed through the claw sections or fork prongs of the anchor 50.
Surface elements 30 can then be laid onto or hooked into the consoles 38, 40 installed in this way or their cantilevers 32, so that all points of the trussed rafter 14 can be accessed via the assembly rail 26 without personal protective equipment. As can also be seen from Figs.
4 and 5, railing posts 60 are also rigidly affixed to the free ends of the relevant cantilevers 32, which comprise hook elements 62 for the removable installation of substantially horizontally extending railing bolts 61 at half height and at their free ends. Such hook elements 62 can also be envisaged on the support structure 34 and in particular the posts 44 and/or the crossbars 48 in order to then be able to removably hook railing bolts 61 to the same in the corresponding manner. In this way the assembly rail 26 can be side-delimited by means of railing elements 44, 60, 61, which reduces the risk of falling to a minimum.
As the installation of the assembly rail 26 to the truss girders 12 is realised during assembly of the same on the ground, all installation and disassembly work subsequently carried out on the trussed rafter 14 can then be carried out from the assembly rail 26 and under the protection of the railing elements 44, 60, 61, so that the installation worker is reliably protected against falling at all times without requiring special protective equipment for this purpose.
Although this is not illustrated in the drawings it should be mentioned here for the sake of completeness that adjacent truss girders 12 of the weather protection roof 10 can be connected with each other via an assembly rail, which is also delimited on both sided by a railing element.
Installation workers can therefore move back and forth directly between individual trussed rafters 14 and in particular access any points in the area of the ridge 16 without effort, so that the time required for installing the weather protection roof 10 can be reduced.

List of reference numbers Weather protection roof 12 Trussed girder 14 Trussed rafter 16 Ridge 18 Purlin Support scaffold 22 Rosette 24 Framework posts 26 Assembly rail 28 Lower strap Surface element 32 Cantilever 34 Support structure 36 Framework diagonal 38 Console Console 42 Diagonal 44 Post of 34 46 Foot-side anchor of 44 48 Crossbar Head-side anchor of 44 52 Cantilever arm 54 Wedge spigot 56 Ridge clamp 58 Safety mandrel Railing post 61 Railing bolt 62 Hook element

Claims

What is claimed is:

1. Truss girder (12) for a roof timbering of a weather protection roof (10), whereby an assembly rail (26) accessible by an installation worker is fitted to the truss girder (12), extending in a longitudinal direction of the truss girder (12), characterised m that the assembly rad (26) flanks the truss girder (12) in a longitudinal direction at the side, whereby the support (32) on which surface elements (30) he extends substantially vertical to the level defined by the truss girder (12).

2 Truss girder according to claim 1, characterised in that the assembly rail (26) comprises several surface elements (30) accessible to an installation worker, which he on supports (32) fitted in a longitudinal direction of the truss girder (12) at distances from each other on the truss girder (12).

3 Truss girder according to claim 1 or 2, characterised in that the supports (32) are designed as cantilevers (32) projecting substantially freely from the truss girder level, each connected with a support structure (34) anchored to framework members (24, 28, 36) of the truss girder (12), which are designed in such a way that they can transfer transverse forces and torque loads originating from the assembly rad (26) to the truss girder (12)

4. Truss girder according to any one of claims 1 - 3, characterised in that the assembly rad (26) is delimited at the side. at least along the side facing away from the truss girder (12), in particular also along the side facing the truss girder (12), by railing elements (44, 60, 61).

Truss girder according to claim 4, characterised in that the railing elements (60, 61) envisaged along the side facing away from the truss girder (112) are formed by posts (60) rigidly connected at the free ends of the supports (32), and in that removably hooked-up bolts (61) are formed at these posts (60) and/or in that the railing elements (44, 61) envisaged along the side facing the truss girder (12) are formed by posts (44) of the support structures (34) extending along the framework level and removably hooked-up bolts (61) at this post (44)

6. Truss girder according to any one of claims 3 - 5, telescopic post (44) extending along the framework level, on both sides of which anchors (50) are envisaged on the framework level, by means of which the support structure (34) is anchored to the framework members (24, 36) of the truss girder (12),

7. Weather protection roof (10) with several truss girders (12) according to one of the above claims, whereby in particular at least two adjacent truss girders (12) are connected with each other by an assembly rail (26) accessible to an installation worker, which is delimited on both sides by a railing element.

8. Weather protection roof according to claim 7, characterised in that the weather protection root (10) is designed as a pitched roof, whereby the assembly rail connecting individual truss girders (12) extends along the ridge (16) of the weather protection roof (10).

9. Installation method for constructing a weather protection roof (10) with at least one truss girder (12) according to at least one of the claims 1 to 6, whereby the assembly rail (26) is fitted to the truss girder (12), at least in part, during the assembly of the truss girder (12) on the ground,