idref="DRAWINGS">FIG. 5 shows two tarpaulins mounted on a common elongated rail structure,

FIG. 6 show one way of mounting a keder roof system,

FIG. 7 show a tarpaulin with attached pull ropes,

FIG. 8A-D show an example embodiment of how to mount a keder roof system,

FIG. 9 shows mounting of a rail holder on an underlying roof support beam,

FIG. 10A-C show one example embodiment of rail holder,

FIG. 11A-C show a further example embodiment of rail holder,

FIG. 12A-B show a perspective view and a side view of an example embodiment of the locking pin,

FIG. 13A-B show a perspective view of the top chord and a cross-sectional view of the foot engaged with the chord, according to an example embodiment of the temporary protective roof system,

FIG. 14 shows a cross-sectional view of the foot engaged with the chord, according to an example embodiment of the temporary protective roof system,

FIG. 15A-B show a perspective view of the top chord and a cross-sectional view of the foot engaged with the chord, according to an example embodiment of the temporary protective roof system,

FIG. 16 show an alternative example embodiment of the tarpaulin attachment interface,

FIG. 17A-B show the modular design of the keder roof system,

FIG. 18A-B show assembly of a lattice guard rail on neighbouring roof support beams, and

FIG. 19-20 show the basic steps of two methods of mounting a keder roof system.

DESCRIPTION OF EXAMPLE EMBODIMENTS

Various aspects of the disclosure will hereinafter be described in conjunction with the appended drawings to illustrate and not to limit the disclosure, wherein like designations denote like elements, and variations of the described aspects are not restricted to the specifically shown embodiments, but are applicable on other variations of the disclosure.

FIGS. 1A and 2 schematically show a perspective overview of the temporary protective roof system according to the present disclosure in form of a keder roof system, wherein FIG. 1A shows an assembled roof support structure 1 before mounting of the a set of tarpaulins, and FIG. 2 shows the assembled roof support structure 1 after mounting of the set of tarpaulins. The assembled and installed keder roof system may be deemed having an extension in a roof width direction 25, a roof length direction 26 that is perpendicular to the roof width direction 25, and a roof height direction 27 that is perpendicular to both the roof width and roof length directions 25, 26.

In the example embodiment of FIGS. 1A and FIG. 2, the assembled roof support structure 1 of FIG. 1A comprises four roof support beams 2-5 arranged spaced apart side by side in the roof length direction 26, namely a first 2, a second 3, a third 4 and a fourth 5 roof support beam, wherein neighbouring roof support beams 2-5 are mutually structurally connected via brazing elements and/or ledgers 6 for defining a rigid framework the forms the roof support structure 1. FIG. 1B shows a closed-up view of a portion of the roof support structure 1 in the region of the fourth roof support beam 5.

One of the primary purposes of the roof support structure 1 is to bridge a space above a room and to carry and hold the tarpaulins at a desired position, and being capable of withstanding loads transferred to the roof support structure 1 from the tarpaulins and caused by for example winds, snow loads, etc.

The finished temporary protective roof system of FIG. 2 comprises a roof ridge region 13, and first eave region 18 and a second eave region 19. The portion of the roof located between the roof ridge region 13 and the first or second eave region 18, 19 may be referred to as an intermediate region 20.

Neighbouring roof support beams 2-5, such as for example the first and second roof support beams 2, 3 jointly define a roof bay 10. Hence, the roof structure of FIG. 2 comprises three roof bay regions 10, 11, 12.

In the example embodiment of FIG. 2, a first tarpaulin 15 is being mounted to cover the first roof bay region 10 by means of first and second roof builders 23, 24, who cooperate for jointly pulling and mounting the first tarpaulin 15 on the roof support structure using two pull ropes 14. A second tarpaulin 16 has been mounted to cover the second roof bay region 11, and a third tarpaulin 17 has been mounted to cover the third roof bay region 12.

In the example embodiment of FIG. 2, the roof is a gambrel-type roof, but the keder rood system is equally useful for other types of roof designs, such as flat roof, leaning roofs, gable-type roofs, etc.

The roof has a modular structure, because the roof support structure 1 is made of a plurality of parts that are temporarily connected. For example, each of the roof support beams 2-5 may be composed of a plurality of straight and/or curved roof support beam units that are interconnected using for example clamping connection or positive locking. Similarly, the brazing elements and/or ledgers 6 are also separate parts that are temporarily connected to the roof support beams.

Consequently, depending on the construction of the modular framework, the roof free span width 7 and roof height 8 of the final roof may vary a lot. For example, the roof free span width 7 may be in the range of 5-50 metres, or more, and roof height, as measured from the vertical support surface at the first or second eave to the roof ridge, may be in the range of 0-30 metres, or more.

FIG. 3A schematically shows a side view of for example the first roof support beam 2 of FIG. 1A, wherein FIG. 3B shows a close-up side view of a curved portion of the first roof support beam 2, and FIG. 3C show a close-up side view of a straight portion of the first roof support beam 2. The roof support beam 2 of FIG. 3A is standing on a support surface 47.

FIG. 4 shows a perspective overview of for example the first roof support beam 2 in a curved portion thereof.

The roof support beams 2-5 may have various structure, composition and design. One particularly attractive design of the roof support beam 2-5 is in form of a lattice beam, lattice girder or truss beam, due to their high structural strength combined with low weigh. Such lattice girder or truss beams may be manufactured using steel, aluminium, or other types of metal. A lattice girder or truss beam, sometimes also referred to as an open web girder, typically comprises a top chord 59, a bottom chord 60 and a plurality of relatively straight structural elements 61 interconnecting the top and bottom chord and forming an essentially triangulated system.

With reference to FIG. 3A-3C and FIG. 4, according to some example embodiments, the first roof support beam 2 carries a detachable first elongated rail structure 30 that has a tarpaulin attachment interface 96 for attachment of the first tarpaulin 15 to the first elongated rail structure 30. This design further increases the modular design of the temporary protective roof system because the roof support beam 2 may be any type of roof support beam, and not necessarily a dedicated roof support beam having integrated tarpaulin attachment interface. Consequently, the scaffolding and/or protective roof system supplier can use an already available roof support beam as load carrying member, or nearly any type of roof support beam, thereby reducing cost and complexity for increasing scope of service to include temporary protective roof systems.

In particular, by providing the roof support beam 2 in form of a lattice beam having top and bottom chords 59, 60 made from steel tubes with 48.3 mm outer diameter, according the European Standard EN 12810-1 for scaffolds products, the lattice beam is compatible for use as a scaffold part, i.e. for building façade scaffolds or the like.

The centre to centre distance of the top and bottom chords 59, 60 of the lattice beam may for example be 500 mm for further improved compatibility with other parts of a scaffold system.

In addition, if for example the tarpaulin attachment interface 96 of the first elongated rail structure 30 becomes damaged, it is not necessary to replace the entire roof support beam, but replacement of the first elongated rail structure 30 is sufficient.

Since the detachable first elongated rail structure 30 is carried by the rigid and load supporting first roof support beam 2, the first elongated rail structure 30 may be designed without any substantial requirement in terms of load capacity. In other words, the first elongated rail structure 30 may be designed with relatively low rigidity for saving weight and cost.

According to the example embodiments of at least FIGS. 3A-8D, the tarpaulin attachment interface 96 for attachment of the first tarpaulin 15 to the first elongated rail structure 30 may be implemented in form of at least a first keder groove 31.

The first keder groove 31 may be integrally formed in the first elongated rail structure 30, for example by manufacturing the first elongated rail structure 30 as a cost-efficient aluminium profile in an aluminium extrusion process, or as a cost-efficient polymeric material profile in a polymeric material extrusion process.

The first elongated rail structure 30 may be made in one piece or composed of a plurality of parts and/or materials.

The first keder groove 31 clearly extends in parallel with the direction of elongation of the first rail structure 30.

According to some example embodiments, the first elongated rail structure 30 comprises a plurality of individual and distributed rail holders 35 for detachably fastening the first elongated rail structure 30 to the first roof support beam 2. The rail holder 35 may for example be fastened to, or integrally formed within, the first elongated rail structure 30, and configured for enabling quick and secure temporary attachment of the first elongated rail structure 30 to the first roof support beam 2 by a roof builder 23, 24.

With reference to FIG. 4, this quick and secure temporary attachment of the first elongated rail structure 30 to the first roof support beam 2 may be accomplished by providing each of the rail holders 35 of the first elongated rail structure 30 with two moveable locking pins for disconnectable engagement with corresponding holes in the top chord 59 of the first roof support beam 2.

FIG. 7 schematically shows a top view of a tarpaulin, such as the first tarpaulin 15, including first, second, third and fourth shuttle arrangements 40, 41, 42, 43, each installed in a separate corner of the first tarpaulin 15. FIG. 7 further shows four pull ropes 14, one connected to each of first to fourth shuttle arrangements 40-43.

With reference to FIGS. 2 and 7, the first tarpaulin 15 may have a rectangular form with first and second opposite side edges 28, 29, and third and fourth opposite side edges 36, 37, wherein the first tarpaulin has a first keder chord 38 located along the first side edge 28 and second keder chord 39 located along the second side edge 29.

FIG. 5 schematically shows a perspective view of first and second tarpaulins 15, 16 in assembled state together with the first elongated rail structure 30, wherein a first shuttle arrangement 40 is attached to the first tarpaulin 15 and connected to a pull rope 14, and wherein a second shuttle arrangement 41 is attached to a neighbouring second tarpaulin 16 and connected to a pull rope 14. FIG. 5 also shows a rail holder 35 with associated rail holder foot 9 that is designed for detachable fastening on a first roof support beam 2.

With reference to FIG. 5, upon mounting of the first tarpaulin 15 on the first elongated rail structure 30, the first keder chord 38 of the first tarpaulin should more or less be completely slidingly inserted into the first keder groove 31 of the first elongated rail structure 30, for providing a strong and sealed connected between the first side edge 28 of the first tarpaulin and the first elongated rail structure 30.

The mounting of the first tarpaulin 15 on the first elongated rail structure 30 is for example performed by a roof builder inserting an end of the first keder chord 38 of the first tarpaulin 15 into an end of the first keder groove 31 of the first elongated rail structure 30. This may for example be performed manually. Thereafter, a pulling force is exerted on the first tarpaulin 15 for sliding the first keder chord 38 into the first keder groove 31 until a desired position is attained. The pulling force is for example exerted on the first tarpaulin 15 via the pull rope 14 of the first shuttle arrangement 40.

FIG. 6 shows an example of a sectional view through an example embodiment of the first elongated rail structure 30 having a first tarpaulin 15 mounted in a first keder groove 31 of the first elongated rail structure 30, and a second tarpaulin 16 mounted in a third keder groove 33 of the first elongated rail structure 30.

The first elongated rail structure 30 is not limited to this specific design, and may alternatively have two keder grooves or six keder grooves, or the like.

The basic steps for mounting single-tarpaulin installation are schematically illustrated in FIGS. 8A-D. With reference to FIG. 8A, before starting mounting of the first tarpaulin 15, the roof support structure 1 with its roof support beams 2-5 and brazing elements 6 is mounted. This may for example be performed by first building roof bays at a convenient location, such as on the ground next to the desired final position, and subsequently lifting the finished roof bays to the desired final position using a crane or the like, and finally connecting the roof bays using brazing elements. A roof bay refers to two roof support beams interconnected by brazing elements to form a rigid entity. Alternatively, single roof support beams may be assembled and subsequently lifter to the desired final position and thereafter connected with neighbouring roof support beams using brazing elements 6.

All required pull ropes are installed in the rope guiding structure 52 in connection with building the roof segments on the ground and before lifting, because pre-installed pull ropes 14 enables avoiding unnecessary climbing on the assembled roof support structure 1.

Mounting, lifting and installing the roof support structure 1 with its roof support beams 2-5 and brazing elements 6 is simplified when the tarpaulins are not yet installed because the wind-sensitivity is reduced, and climbing on the roof support structure for connecting neighbouring roof support beams is simpler before mounting the tarpaulins 15, 16.

With reference to FIG. 8B, when the roof support structure 1 with its roof support beams 2-5 and brazing elements 6 is completed, mounting of the first tarpaulin 15 may begin. This may be performed by first placing the first tarpaulin 15 at a location close to for example the first eave region 18, and inserting an end of the first and second keder chord 38, 39 of the first tarpaulin 15 in appropriate keder grooves 31-34 of the first and second elongated rail structures 30, 62, and connecting the pre-installed pull ropes 14 with first and second shuttle arrangements 40, 41. Note that the second shuttle arrangement 41 is not visible in FIG. 8B because it is located on the backside of the first tarpaulin 15.

Thereafter, with reference to FIGS. 8C and 8D, roof builders 23, 24 located at the second eave region 19 may manually pull the pull ropes 14 connected with the first and second shuttle arrangements 40, 41 for mounting the first tarpaulin 15 until it covers the entire first roof bay region 10, as shown in FIG. 8D.

FIGS. 9 and 10A-C show schematically an example embodiment of a foot 9 of a rail holder 35, wherein FIG. 9 shows a perspective view of the rail holder 35 with foot 9 when approaching the first roof support beam 2 that has two locking holes 67 or recesses, FIG. 10A shows a side-view of the same position, FIG. 10B shows the foot 9 after a contact surface 66 of the foot 9 has arrived in contact with an exterior surface of the first roof support beam 2 but before two locking pins 68 of the foot 9 have been inserted into the associated locking holes 67 or recesses of the first roof support beam 2, and FIG. 10C shows the foot 9 after the locking pins 68 of the foot 9 have been inserted into the associated locking holes 67 or recesses of the first roof support beam 2.

Consequently, in some example embodiments, the first roof support beam 2 is a lattice girder having has a top chord 59, a bottom chord 60, and a plurality of interconnecting elements 61 fastened to the top and bottom chords and arranged for transmitting loads between the top and bottom chords, and wherein the locking holes 67 are provided in the top and/or bottom chords 59, 60.

Furthermore, in some example embodiments, a central axis of each locking hole 67 is oriented substantially perpendicular to a plane defined by the interconnecting elements 61, i.e. not deviating more than 25 degrees from a plane that is perpendicular to a plane defined by the interconnecting elements 61.

Each of the top and bottom chords are may for example be made of hollow cylindrical tubes, thereby enabling drilling or stamping of highly accurate locking holes 67 with low level of tolerances.

The rail holder 35 thus has a foot 9 that is configured for being in contact with the first roof support beam 2, and the two moveable locking pins 68 are located in said foot 9.

In the example embodiment of FIGS. 9 and 10A-C, the locking pins 68 are spring-loaded towards the locked and engaged position showed in FIG. 10C, but the locking pins 68 may be selectively set in a stable open and closed state by pulling the control arms 69 outwards for removing the locking pins 68 from the locking holes 67, and subsequently turning the two control arms 69 for setting the locking pins 68 in a stable disengaged position.

Alternatively, for additional safety, the locking pins 68 may be secured in the engaged position by means of a final turning motion of the control arms in engaged position. In such case, the locking pins 68 may be shifted from an engaged state to a stable disengaged state by first turning the two control arms 69, for example 90 degrees, pulling the control arms 69 outwards against the spring force of the spring-loading springs for removing the locking pins 68 from the locking holes 67, and subsequently turning the two control arms 69, for example 90 degrees, for setting the locking pins 68 in a stable disengaged position.

Each of the two moveable locking pins 68 is thus coupled to a common or separate control arm 69 for enabling motion control of the moveable locking pin between the engaged position and disengaged position by manually operating said control arm 69.

Moreover, each of at least two moveable locking pins 68, can be selectively set and/or locked in the engaged position and disengaged position, by manually turning the control arm 69.

The two moveable locking pins 68 are thus moveable between an engaged position, in which the locking pins are engaged within the holes 67 in the first roof support beam 2 for securing the rail holder to the first roof support beam 2, and a disengaged position, in which the locking pins are not engaged within the holes 67 and the rail holder is removable from the first roof support beam 2.

The moveable locking pins 68 are moveable in a direction towards and away from the first roof support beam 2 when shifting between the disengaged/engaged positions.

In particular, the moveable locking pins 68 may be linearly moveable in a plane located in the range of +/−30 degrees from a direction perpendicular to the first roof support beam 2. When the locking pins has an elongated or cylindrical shape, each moveable locking pin may be moveable in a direction of elongation, or in an axial direction, of said locking pin 68.

The two moveable locking pins 68 are configured for engaging opposite sides of the first roof support beam 2. Furthermore, the two moveable locking pins 68 may be arranged substantially aligned with each other, or at least not diverging more than 30 degrees from each other.

In the example embodiment of FIG. 10B the rail holder 35 comprises an elongated beam having first and second ends 44, 46, wherein the first end 44 of the beam is provided with a rail attachment interface 45 configured for enabling rigid connection with the first elongated rail structure 30, and wherein the second end 46 of the beam is provided with the foot 9 for enabling detachable connection with the first roof support beam 2.

The foot 9 has a load carrying portion 20 with a contact surface 66 configured for abutting and transmitting a load to the upper chord 59 of the first roof support beam 2 when the foot 9 is installed on the first roof support beam 2, and wherein the foot 9 further has first and second rigid side portions 76, 77 configured for extending partly over the sides of the upper chord 59 and for holding the locking pins 68.

With reference to for example FIG. 5, the load carrying portion of the foot 9 is made of sheet metal that has been bent to have a U-shape 78, wherein the elongated beam of the rail holder 35 is attached to an outer side of the bottom portion of the U-shaped sheet-metal part 78, and the contact surface is defined by the end edges of the lateral sides of the U-shaped sheet-metal part 78, and wherein said lateral sides are offset from each other with of a distance 79 of 40-250 mm.

The locking pins 68 may have a slightly conical shape, such that at least the conical part of each locking pin 68 may interact with the locking hole or recess 67 for ensuring improved stability and eliminated play.

The reliable and accurate angular positioning of the foot 9 on the first roof support beam 2 provided by the play-free engagement of the locking pins 68 with the locking holes 67 ensures that neighbouring rail holders 35, in the roof length direction 26, are mounted in parallel with each other. As a result, a distance between keder groves of neighbouring first and second elongated rail structures 30, 62 may be nearly constant, or at least within relatively tight tolerances, over the length of the first and second elongated rail structures 30, 62, such that the tarpaulins 15-17 are more easily mounted and dismounted within said keder grooves.

Others said, when neighbouring rail holders 35 are not mounted in parallel with each other, i.e. slightly inclined with respect to each other, the distance between keder groves of neighbouring first and second elongated rail structures 30, 62 is either too small or too large, thereby rendering mounting/dismounting of the tarpaulins more difficult.

A further example embodiment of the foot 9 is described below with reference to schematically illustrated FIGS. 11A-C, which shows a foot 9 with two-spring loaded locking pins 68 arranged with snap-fit functionality. In other words, the locking pins 68 are by default always urged forwards towards an inwards protruding position by means of mechanical spring devices 70, as showed in FIG. 11A.

Upon pushing the foot towards the roof support beam 2, as depicted by foot motion arrow 73, the locking pins 68 are temporarily automatically retracted to the retracted position. Specifically, the pushing causes the locking pins 68 to automatically become temporarily retracted due to contact with the external rounded surface 80 of the roof support beam 2, as shown in FIG. 11B.

Upon further motion of the foot 9 towards the roof support beam 2, the contact surface 66 of the foot 9 comes into contact with the roof support beam 2 and the locking pins 68 may pushed into the locking hole 67 by the mechanical spring devices 70, such that the foot 9 and rail holder 35 becomes firmly and reliably connected to the roof support beam 2, as showed in FIG. 11C.

In other words, in some example embodiments, the rail holder 35 and the first roof support beam 2 are configured for providing automatic attachment of the rail holder 35 to the first roof support beam 2 when the foot 9 of the rail holder 35 is pushed towards the first roof support beam 2.

Moreover, a contact surface 80 of the first roof support beam 2 configured to receive the foot of the rail holder 35 is rounded or inclined, such that the locking pins 68 are configured to be automatically pushed back against the force of a spring device when the foot 9 is pushed towards the first roof support beam 2 and the locking pins 68 start engaging an exterior surface 80 of the first roof support beam 2, and such that the locking pins 68 are configured to automatically move forwards into the locking holes 67 of the first roof support beam 2 when the foot with the locking pins 68 reaches the final position.

With reference to in particular FIGS. 11A-C, the front end 71 of the locking pins 68 may have a slightly conical shape for ensuring improved stability and eliminated play.

FIG. 12A schematically shows a perspective view of an example embodiment of the locking pin 68 and FIG. 12B schematically shows a side view of said locking pin 68.

A front region 81 of said two locking pins 68 may have a conical or tapered shape over a portion 82, such as for example at least 3 mm, of a total length 83 of the locking pin 68, such that a conical or tapered front region 81 of the locking pin 68 is configured to interact with the locking hole or recess 67.

Furthermore, a cylindrical portion 84 of the locking pins 68 may have a diameter in the range of 4-25 mm.

The locking pins have been primarily described herein as being mainly cylindrical, but the locking pins 68 may have other cross-sectional shapes.

The foot 9 of the rail holder 35 may in some example embodiments comprise at least two spring-loaded locking pins 68 for detachable engagement with corresponding holes 67 located in the first roof support beam 2, for safely and reliably connecting the rail holder 35 and associated first elongated rail structure 30 to the first roof support beam 2.

The snap-fit foot 9 of FIGS. 11A-C is subsequently removed by for example manually pushing the two spring-loaded locking pins 68 backwards and simultaneously lifting the foot and rail holder away from the support beam 2.

Consequently, with reference to FIGS. 1A-12B, the present disclosure relates to a keder roof system comprising: a first roof support beam 2 configured for providing main support and strength to a roof, a first elongated rail structure 30 having a first keder groove 31 and a rail holder 35 for detachably fastening the first elongated rail structure 30 to the first roof support beam 2, a first tarpaulin 15 having a rectangular form with first and second opposite side edges, wherein the first tarpaulin 15 has a first keder chord 38 located along the first side edge and a second keder chord 39 located along the second side edge, and wherein the first keder chord 38 is configured for being inserted into, and slidingly moveable within, the first keder groove 31 of the first elongated rail structure 30, wherein the rail holder 35 of the first elongated rail structure 30 comprises at least two moveable locking pins 68 for disconnectable engagement with corresponding holes 67 in the first roof support beam 2.

Again with reference to FIGS. 1A-12B, the keder roof system further comprises: a second roof support beam 3 configured for providing main support and strength to a roof; a second elongated rail structure 62 having a first keder groove 31 and a rail holder 35 for detachably fastening the second elongated rail structure 62 to the second roof support beam 3; wherein the first and second roof support beams 2, 3 are configured for being located spaced apart side by side and interconnected by means of brazing elements and/or ledgers 6 for defining a rigid roof bay; wherein the second keder chord 39 of the first tarpaulin 15 is configured for being inserted into, and slidingly moveable within, the first keder groove 31 of the second elongated rail structure 62; and wherein the rail holder 35 of the second elongated rail structure 62 comprises at least two moveable locking pins 68 for disconnectable engagement with corresponding holes 67 in the second roof support beam 2.

The above-described embodiments include two moveable locking pins 68 of the rail holder 35 engaging within corresponding locking holes 67 of the top or bottom chord 59, 60. However, the two moveable locking pins 68 may alternatively engage other parts of the first roof support beam 2, while still providing an acceptable coupling strength and stability between the rail holder 35 and first roof support beam 2.

For example, with reference to FIGS. 13A and 13B, the top and/or bottom chord 59, 60 may have at least two elongated recesses 67 that extends over the entire length of the chord 59, 60, or over a portion of the length of the chord. The recesses 67 may for example be arranged on substantially opposite side of the top and/or bottom chord 59, 60. FIG. 13A shows a perspective view of the top chord 59 and FIG. 13B shows a cross-sectional view showing the foot 9 in engaged state with the top chord 59.

Specifically, FIG. 13B shows the at least two moveable spring-loaded locking pins 68 being engagement within the two elongated recess 67 of the first roof support beam 2.

In those embodiments where the attachment location of the rail holder 35 on the roof support beam 2 is not critical, the embodiment of FIGS. 13A-13B provides increased flexibility, because the rail holder 35 may be disconnectably engaged at any position along the length of the roof support beam 2.

However, in those embodiments where the attachment location of the rail holder 35 on the roof support beam 2 needs to be pre-defined, or even locked in the length-direction of the roof support beam, some type of lengthwise locking structure may be required. For example, the foot 9 may be provided with a protrusion 99 or the like that is configured to be engageable in a corresponding hole or recess 100 in the top and/or bottom chord 59, 60, for providing a desired position locking of the rail holder 35 in the length-direction of the roof support beam 2.

A further example embodiment is shows in FIG. 14, in which the top and/or bottom chord 59, 60 has a form that enables the two moveable locking pins 68 of the rail holder 35 to reliably engaged behind top and/or bottom chord 59, 60. In other words, the cross-section of the top and/or bottom chord 59, 60 is selected to provide an abutment surface, against which the two moveable locking pins 68 may exert a pressing force for clamping the foot 9 against the top and/or bottom chord 59, 60.

FIG. 14 shows a cross-sectional view showing the foot 9 in engaged state with the top chord 59, which in this example embodiment has a D-shape with a rounded exterior surface 101 facing towards the first elongate rail structure 30 and with an at least partly essentially flat exterior surface 102 facing towards the interconnection elements 61 of the roof support beam 2. Thereby, the two moveable locking pins 68 of the rail holder 35 may reliably be engaged behind the top chord 59, without having to drill potentially weakening locking holes in the upper chord. Other forms and shapes of the top and/or bottom chord 59, 60 is of course possible.

As discussed above with reference to FIGS. 13A-13B, the same issue with positioning and/or locking of the rail holder 35 in the length-direction of the roof support beam 2 applies also here. Hence, if a locking of the foot 9 in the length-wise direction is desired, the foot 9 may be provided with a protrusion 99 (not showed) or the like that is configured to be engageable in a corresponding hole or recess 100 (not showed) in the top and/or bottom chord 59, 60.

Still a further example attachment of two moveable locking pins 68 with the top or bottom chords 59, 60 is schematically illustrated in FIGS. 15A-B, wherein FIG. 15A shows a perspective view of the top chord 59 and FIG. 15B shows a cross-sectional view showing the foot 9 in engaged state with the top chord 59.

In this example embodiment, the top chord 59 of the roof support beam 2 is provided with a dedicated locking pin receiving structure 103. The locking pin receiving structure 103 may for example be welded or otherwise secured to the roof support beam 2, and the locking pin receiving structure 103 may be arranged such that the two moveable locking pins 68 of the rail holder 35 may be engaged with the holes or recesses 67 of the locking pin receiving structure 103, for disconnectable attachment of the rail holder 35 to the roof support beam 2.

In the example embodiment of FIGS. 15A-15B, the locking pin receiving structure 103 corresponds to two plates that are welded to the top chord 59 and provided with a locking hole 67. Other forms and shapes of the locking pin receiving structure 103 is of course possible.

The tarpaulin attachment interface 96 of the first elongated rail structure 30 is herein primarily disclosed in form of keder grooves 31-34. However, the benefits of providing the rail holder 35 with at least two moveable locking pins for disconnectable engagement with first roof support beam 2 is not restricted to a keder groove/chord roof connection. Consequently, with reference to FIG. 16, the tarpaulin attachment interface 96 of the first elongated rail structure 30 may in some example embodiments comprise an elongated nailing strip 97 that is fastened on top side of the first elongated rail structure 30, wherein the first tarpaulin 15 has a rectangular form with first and second opposite side edges, and wherein the first tarpaulin 15 is configured for being nailed to the nailing strip 97.

The elongated nailing strip 97 typically extends over the entire length of the first elongated rail structure 30 for providing good flexibility in terms of attachment position of the first and second tarpaulins 15, 16.

Specifically, two neighbouring tarpaulins, each covering a separate part of the roof in the roof length direction 26, may first be rolled out on the roof support structure 1, with their respective first and second side edges 28, 29 overlapping at the region of the elongated nailing strip 97. Thereafter, a roof builder may fasten the first and second tarpaulins 15, 16 to the elongated nailing strip 97, at a plurality of locations along the length of the first elongated rail structure 30, using an appropriate fastener 104, such as a nail or a staple.

Upon subsequent disassembly of the temporary protective roof system, the roof builder removes the plurality of fasteners 104 and removes the first and second tarpaulins 15, 16. Alternatively, in case the first and second tarpaulins 15, 16 are single-use items, the roof builder may for example simple tear off the first and second tarpaulins 15, 16 from the elongated nailing strip 97.

FIG. 17A shows schematically a side view of an assembled first roof support beam 2 having a first elongated rail structure 30 temporarily fastened on an upper side of first roof support beam 2, as well as a second elongated rail structure 62 temporarily fastened on an under side of first roof support beam 2.

FIG. 17B shows schematically a side view of an exploded view of the first roof support beam 2 of FIG. 17A. FIG. 17B thus shows an example embodiment of the modular composition of the first roof support beam, the first elongated rail structure 30, and the second elongated rail structure 62.

In this example embodiment, the first and second elongated rail structures 30, 62 are of the keder type, i.e. includes keder grooves, but the modular design described here is not limited to the keder type tarpaulin attachment interface, and the tarpaulin attachment interface may instead be of the nailing strip type, or any other type.

The first and second elongated rail structures 30, 62 may have similar or identical design, i.e. similar or identical type and number of keder grooves, similar or identical type of rope guiding structure 52, such that the same type of tarpaulins may be selectively installed in the first or second elongated rail structures 30, 62.

This type of double installation of tarpaulins both above and below the first roof support beam 2 may be useful for improved heat insulation, or the like. Furthermore, the keder roof system may be built with only the second elongated rail structure 62, i.e. only the lower rail structure 62, if desired.

In other words, the first roof support beam 2 may be composed of a plurality of support beam elements 63 that may have various forms, such as straight element and curved elements, and the desired first roof support beam 2 may thus be built by assembling and mutually fastening an appropriate set of support beam elements 63.

Similarly, the first elongated rail structure 30 is composed of a plurality of elongated rail sections 64 that are connected end to end, in continuation with each other, to jointly form the first elongated rail structure 30. Likewise, the second elongated rail structure 62 is also composed of a plurality of elongated rail sections 64 that are connected end to end, in continuation with each other, to jointly form the second elongated rail structure 62.

In the example embodiment of FIG. 17B, each of the first and second elongated rail structures 30, 62 are composed of a curved elongated rail section 64 and a plurality of straight elongated rail sections 64.

The straight elongated rail sections 64 of the first and second elongated rail structures 30, 62 may be identical, such that the straight elongated rail sections 64 can be fastened to both on the upper and lower side of the first roof support beam 2.

The curved elongated rail sections 64 of the first and second elongated rail structures 30, 62 are different because the rail holders 35 for attaching the curved elongated rail sections 64 to the first roof support beam 2 are located on opposite sides.

Consequently, in some example embodiments, the first elongated rail structure 30 is composed of a plurality of elongated rail sections 64 connected end to end to jointly form the first elongated rail structure 30, and wherein at least one elongated rail section 64 of the first and/or second elongated rail structures 30, 62 comprises a rail holder 35, in particular two, three or four rail holders 35, for detachably fastening the elongated rail section 64 to a first roof support beam, in particular on a vertical upper or lower side of the first roof support beam 2.

The first elongated rail structure 30 is detachably fastened to the first roof support beam 2 by means of a plurality of individual rail holders 35 that are located spaced apart along the length of the first elongated rail structure 30.

With reference to FIG. 17A, the rail holders 35 have a foot 9 for detachable fastening the elongated rail section 64 on the first roof support beam 2, and a contact surface 66 of the foot 9, i.e. the surface of the foot that is in contact with and load-carrying relative to the first roof support beam, is located spaced apart from the first keder groove 31 with a distance 65 of at least 10 cm, specifically at least 25 cm, and more specifically within a range of 10-150 cm, specifically 15-50 cm, as measured in a direction opposite to the direction of elongation of the elongated rail section. This reduces the risk of damages and/or wear to the tarpaulins caused be interference with the roof support structure 1.

With reference to FIGS. 3A-B, 4 and 17A-B, the rope guiding structure 52 of the first elongated rail structure 30 may in some example embodiments comprise at least one individual rope guiding member 74, 75 located on an elongated rail section 64 or along the first elongated rail structure 30, in particular two, three, four or five individual rope guiding members 74, 75 located longitudinally spaced apart on an elongated rail section 64 or along the first elongated rail structure 30.

With reference to FIGS. 3A-B, 4 and 17A-B, the least one individual rope guiding member 74, 75 is located on the at least one curved elongated rail section 64, and wherein at least one, specifically all, straight elongated rail section 64 is free from said rope guiding structure 52.

With reference to FIGS. 4 and 17A-B, the first elongated rail structure 30 comprises a plurality of individual rope guiding members 74, 75 located spaced apart on an outer side, in the height direction, of the first elongated rail structure 30, and the first elongated rail structure 30 comprises a plurality of individual rope guiding members 74, 75 located spaced apart on an inner side, in the height direction, of the first elongated rail structure.

FIG. 18A shows a top-view of first and second roof support beams 2, 3 in mounted state, and two rail holders 35 of a first elongated rail section 30 are mounted on each of the first and second roof support beams 2, 3. As described above with reference to FIGS. 1A and 2, neighbouring roof support beams 2-5 are mutually structurally connected via brazing elements and/or ledgers 6 for defining a rigid framework the forms the roof support structure 1. According to some example embodiments, as illustrated in FIGS. 18B and 1B, neighbouring roof support beams 2-5 may be mutually structurally connected by connecting said brazing elements and/or ledgers 6 to the rails holders 35 of the first and second elongated rail structures 30, 62. FIG. 18A shows the brazing element 6 while being moved towards the rail holders 25, and FIG. 18B shows the brazing element 6 after complete connection with the rail holders 25.

By providing the rail holders 35, in particular the foot 9 of the rails holders 35, with a brazing element attachment interface 93 for connection with available quick-coupling brazing elements and/or ledgers 6, the roof support structure 1 is provided with increased options for quickly add further structural strength to the roof support structure, if needed, by simply installing some additional quick-coupling brazing elements and/or ledgers 6 between neighbouring first and second roof support beams 2, 3.

In the example of FIG. 18A, the brazing element and/or ledger 6 is provided in form of a quick-coupling lattice guard rail, which is a standard component of many scaffold manufacturing companies. The lattice guard rail 6 has four hook-shaped attachments 92 for connecting with the brazing element attachment interface 93 of four individual rails holders 35. As a result, the lattice guard rail 6 is arranged lying between the neighbouring first and second roof support beams 2, 3, as shown also in FIG. 1A.

The brazing element attachment interface 93 of each foot 9 may be provided in form a bracket 95 provided on each side of the foot 9 for enabling attachment of a lattice guard rail 6 to neighbouring roof support beams on both sides. Furthermore, the brazing element attachment interface 93 of each foot 9 may be provided with a flat support surface 94 on each side of the foot 9 for engagement with the four hook-shaped attachments 92, thereby providing further improved stability of the finished roof support structure 1. The bracket 95 and flat support surface 94 of the foot 9 is also shows in FIGS. 2 and 10B.

The rail holder 35 may in some example embodiments be made of a separate foot 9 that is detachably connected to a separate elongated beam to form the rail holder 35.

This design enabling use of the foot alone as a coupling member for connecting brazing elements or scaffold parts to the roof support beam, by means of the attachment interface 93 of the foot 9.

With reference to FIG. 19, the present disclosure also describes a method for assembling a temporary protective roof system. The method comprises a first step S1 of providing a first roof support beam 2 and providing a first elongated rail structure 30 having a tarpaulin attachment interface 96 and a rail holder 35. The method further comprises a second step S2 of detachably fastening the first elongated rail structure 30 to the first roof support beam 2 by engagement of at least two moveable locking pins 68 of the rail holder 35 with the first roof support beam 2. Thereafter, the method includes a third step of assembling a first tarpaulin 15 on the first elongated rail structures 30 by attaching the first tarpaulin 15 to the tarpaulin attachment interface 96 of the first elongated rail structure 30.

Specifically, when the tarpaulin attachment interface 96 corresponds to a first keder groove 31, the third step of assembling a first tarpaulin 15 on the first elongated rail structures 30 involves installing a first keder chord 38 of the first tarpaulin in the first keder groove