AU2018345797A1

AU2018345797A1 - Hammock safety system

Info

Publication number: AU2018345797A1
Application number: AU2018345797A
Authority: AU
Inventors: Manuel Lüscher; Daniel Zaugg
Original assignee: Zaugg Construction GmbH
Current assignee: Zaugg Construction GmbH
Priority date: 2017-10-04
Filing date: 2018-10-03
Publication date: 2020-04-09
Also published as: CN111247299A; DE102017123014A1; EP3717718A1; WO2019069246A9; WO2019069246A1

Abstract

The invention relates to a spacer element (22) for supporting two yoke timbers (18) of a slab formwork (1), which run parallel to one another and are supported on props (12), in a transverse direction (4) transversely to the yoke timbers (18) and transversely to the props (12), comprising a beam element (24) having two opposite end sides, on which there are arranged bearing elements (26, 26') for taking up transverse forces in and against the transverse direction (4) from the yoke timbers (18), characterised by holding elements (33) on the end sides of the beam element (24) for fastening a net (27).

Description

The present invention relates to a spacer element for supporting two parallel yoke beams of a slab formwork supported on slab props as well as a fa 11-protection system for a slab formwork with the spacer element.

Spacer elements for slab formwork are known, for example, from EP 0049096 Al.

It is the object of the invention to improve known spacer elements for slab formwork.

The task is fulfilled by the characteristics of the independent claim 1. Preferred embodiments are the subject matter of the dependent claims.

According to one aspect of the invention, a spacer element for supporting two parallel yoke beams of a slab formwork supported on slab props in a transverse direction transverse to the yoke beams and transverse to the slab props comprises a beam element with two opposite end sides on which bearing elements are arranged to absorb transverse forces in and against the transverse direction from the yoke beams. According to the invention, the cited spacer element comprises retaining elements on the ends of the beam element to hold a net.

The cited spacer element is based on the idea that, when assembling slab formwork, the assembler first sets up the scaffolding with the props, the yoke beams and the spacer elements, and then places the actual formwork slab on the scaffolding. When laying the formwork slab, high demands are placed on the balancing ability of the assembler. However, safety measures must also be taken for emergencies, for example if the assembler becomes unexpectedly dizzy.

In the formwork slab mentioned at the beginning, the spacer elements have a very small distance from each other. This has the advantage that, in the event of a fall, the assembler could grab a nearby spacer element. It would also be possible to connect the assembler to the yoke beams by means of a personal fall-arrest system. In any case, the construction has a large number of individual parts which are very time-consuming to assemble. Furthermore, using a personal fall-arrest system restricts the freedom of movement of the assembler, which further increases the time required for laying the formwork slab.

The cited spacer element takes a different approach here with the proposal to attach retaining elements for a net. The entire scaffold can be assembled first and the net can be attached to the retaining elements. The net covers a large catching area so that the spacer elements and the yoke beams can be arranged at a large distance from each other. The assembler does not need to use a personal fall-arrest system, and can lay the formwork slab with the greatest possible freedom of movement. This significantly reduces the time needed to assemble slab formwork.

In one embodiment of the cited spacer element, the retaining elements are arranged on the bearing elements. In this way the net can be stretched to provide the largest possible catching area.

In a preferred embodiment of the cited spacer element, the retaining elements are formed integrally with the bearing elements. In this way, the retaining elements are firmly held to the bearing elements and provide a very high level of support for the net. The bearing element and the retaining element can, for example, be welded together to form one piece. An alternative embodiment would be to integrate the retaining element in the bearing element, for example if the bearing element has a suitable opening as retaining element in which the net could be knotted.

In another advanced embodiment of the specified spacer element, the retaining elements are suspension elements in which the net can be suspended. Hooking in the net is not only very time-saving when assembling the slab formwork; it also allows the net to be removed very quickly when dismantling the slab formwork.

In an additional further embodiment of the specified spacer element, each suspension element includes a hook. The hook makes it easy to create a detachable connection between the net and the suspension element without having to attach an openable interlocking element to the net. However, an eye-shaped design of the suspension element would also be conceivable, in which case the net would have to be suspended by means of carabiners, for example.

In a special further embodiment of the specified spacer element, each suspension element comprises a further hook, whereby the hooks in each suspension element are arranged anti-parallel and at a distance to one another. The two anti-parallel hooks, which are aligned in relation to one another, secure the suspended net against accidental slipping out.

In yet another further embodiment of the specified spacer element, the bearing elements can be plugged onto the yoke beams and moved on the yoke beams. In this way, the distance between the spacer elements can be set as required and, for example, adapted to the maximum tensile strength of a net.

In a practical further embodiment of the specified spacer element, the bearing elements which can be moved on the yoke beams comprise a fixing point for the application of a fixing element which fixes the bearing element to the yoke beam against displacement. The fixing element can be a screw, nail, rivet or the like. The fixing element is used to prevent the spacer elements supporting the net from moving towards each other when the net is in use, in case an assembler falls into the net.

According to another aspect of the invention, a faII-protection system for a slab formwork comprises two parallel yoke beams running parallel to each other and supported on slab props and two specified spacer elements supporting the yoke beams in a transverse direction transverse to the yoke beams and transverse to the slab props.

In the specified fa 11-protection system, the two spacer elements should always be less than 2.50 m apart from each other in order not to exceed permissible maximum loads on the slab formwork.

According to another aspect of the invention, a method for securing an assembler on a slab formwork when placing a formwork ceiling on the slab formwork comprises the following steps: assembling the slab formwork by erecting slab props and connecting the slab props with yoke beams in a longitudinal direction transverse to the slab props connecting the slab props with spacer elements in a transverse direction transverse to the slab props and transverse to the yoke beams, and fastening a net to the erected slab formwork at least halfway up the slab props in such a way that an area spanned by the transverse direction and the longitudinal direction, and limited by the yoke beams and the spacer elements, is covered by the net.

The above-described properties, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer in connection with the following description of the embodiments, which are described in more detail in connection with the drawings, in which:

Fig. 1 shows a schematic room view of a slab formwork,

Fig. 2 shows a schematic room view of a bearing element in the slab formwork of Fig. 1;

Fig. 3 shows a schematic side view on a beam element in the slab formwork of Fig. 1;

Fig. 4 shows a room view of a section of the beam element of Fig. 3;

Fig. 5 shows a schematic room view on an end of a spacer element in the slab formwork of Fig. 1;

Fig. 6 shows a schematic room view of the spacer element of Fig. 5 being suspended on a yoke beam and carrying a net,

Fig. 7 shows a schematic room view of a bearing element of an alternative slab formwork, and

Fig. 8 shows a schematic room view of the alternative slab formwork only partly assembled.

In the drawings, the same technical elements are provided with the same reference signs, and are only described once. The drawings are purely schematic and, in particular, do not reflect the actual geometric proportions.

Reference is made to Fig. 1 which shows a schematic room view of a slab formwork 1. The slab formwork 1 is assembled in a room 2 which extends in a longitudinal direction 3, a transverse direction 4 and a vertical direction 5, and which is delimited by a floor 6 and walls 8. Room 2 can be entered through a door 10. The task of slab formwork 1 is to hold a formwork slab that is not shown in further detail, on which a concrete ceiling can be poured to enclose room 2 on the side opposite floor 6.

For this purpose, the slab formwork 1 comprises a plurality of slab props 12, each of which comprises a prop foot 14 set up on the floor 6 in the vertical direction 5 and a yoke element 16 on the side opposite the prop foot 14. The slab props 12 have a telescopic design, so that the distance between the prop foot 14 and the yoke element 16 can be adjusted.

In the yoke element 16 of the slab props 12 there are yoke beams 18 extending in the longitudinal direction 3 on which the formwork slab not shown in further detail can be placed. The yoke beams 18 are shorter in the longitudinal direction 3 than the slab to be produced on the slab formwork 1, which is why several yoke beams 18 are lined up in the longitudinal direction 3 and joined together in a joint area 20 by butt joints. Not all of these joint areas 20 are referenced with a reference sign in Fig. 1.

To absorb forces in the transverse direction 4, spacer elements 22 are arranged between the yoke beams 18, which ensure a constant distance between the yoke beams 18, and prevent the construction from falling over until the formwork slab is placed on the yoke beams 18. Each spacer element 22 comprises a beam element 24 extending in the transverse direction 4, at both ends of which a bearing element 26 in the form of a connecting bracket is suspended in the yoke beams 18 in the transverse direction 4.

When assembling the slab formwork 1, spacer elements 22 are placed at the joint areas 20. The then remaining spacer elements 22 are distributed evenly over the areas between the joint areas 20 and/or over the areas between a joint area 20 and a wall 8. In the present embodiment, nets 27 are attached to the individual bearing elements 26.

An assembler can walk on the yoke beams 18 to assemble the formwork slab mentioned above. If the assembler loses his balance during this work, the nets will catch him.

Two different embodiments for fastening the nets are described below. The first embodiment is shown in Figs. 2 to 6. The second embodiment is described in Figs. 7 to 10. Both embodiments can be combined in any way.

Reference is made to Fig. 2, which shows a schematic room view of one of the bearing elements 26 in the slab formwork 1 of Fig. 1.

The bearing element 26 has a hook 28 with a hook front plate 29 extending in the vertical direction 5, and a hook rear plate 30, which are connected to each other at the top side with a hook cover plate 31 when seen in the vertical direction 5.

A positive locking element in the form of a push-on sleeve 31 extends from the hook front plate 31 in the transverse direction 4 away from the hook 28, onto which one of the beam elements 24 of Fig. 1 can be pushed. To secure the beam element 24 on the push-on sleeve 31, a passage opening 32 is passed through the outer surface of the push-on sleeve 31, into which a safety bolt can be inserted, as referenced for example in Fig. 4 with the reference sign 43. The push-on connection between the bearing element 26 and the beam element 24 will be discussed in more detail later.

Seen in vertical direction 5, a retaining element 33 is arranged below the push-on sleeve 32. The retaining element 33 in the present embodiment comprises a first hook 34 which lies anti-parallel to a second hook 35 in a plane spanned by the transverse direction 4 and the vertical direction 5.

In this context, antiparallel means that a hook opening 36 for inserting a rope, a ring or the like of the first hook 34 points in a different direction than a hook opening 36 of the second hook 35, at least when viewed in the transverse direction 4. In order for the abovementioned rope or ring to be inserted into the two hooks 34, 35, the two hooks 34, 35 must be spaced apart from each other by a distance 37 in the longitudinal direction 3.

Seen in the vertical direction 5 below the retaining element 33, a further duct opening 32 is executed through the hook front plate 29, which will be discussed in more detail later.

Before the use of the bearing element 26 of Fig. 2 in slab formwork 1 is described in more detail, the beam elements 24 will first be explained in more detail using Fig. 3 and 4, in which one of the beam elements 24 is shown schematically.

As with the slab props 12, the beam element 24 is designed as a telescopic tube with a first partial tube 38 and a second partial tube 39 guided in the first partial tube 38.

The first partial tube 38 has an inner diameter not shown in Fig. 3 which is larger than the outer diameter of the push-on sleeve 31. The first partial tube 38 can therefore be fitted onto the push-on sleeve 31 of the bearing elements 26. At each of its two ends, the first partial tube 38 has a passage opening 32 passing through the outer surface, which is designed in the same way as the passage opening 32 passing through the outer surface of the push-on sleeve 31 of the bearing element 26. If the first partial tube 38 is plugged onto the push-on sleeve 31 with the end opposite the second partial tube 39, the two passage openings 32 can be placed congruently one above the other so that the abovementioned safety bolt can be passed through the passage openings 32.

The second partial tube 39 has a first tube section 40 and a second tube section 41 concentrically mounted on the first tube section. The first tube section 40 has a smaller outside diameter than the second tube section 41. The outer diameter of the first tube section 40 is also smaller than the inner diameter of the first partial tube 38, so that the first tube section 40 can be inserted into the first tube section 38.

On the first tube section 40 of the second partial tube 39 there is a row of holes 42 with passage openings 32 through the outer surface of the first tube section 40. Each passage opening 32 of hole line 42 can be placed congruently over the passage opening 32 at the end of the first partial tube 38, into which the second partial tube 39 is inserted. In this way, the two partial tubes 38, 39 can be fixed in different axial positions to each other with a safety bolt 43. At the second tube section 41 opposite the first tube section 41 there is another passage opening 32 which works in the same way as the passage opening 32 at the other end of the telescopic tube, which is why a detailed description is not made here.

The safety bolt 43 has a bolt head 44, from which the actual bolt element 45, which can be inserted into the passage openings 32, extends away. Optionally, the bow spring 46 shown in Fig. 4 can be arranged in such a way that it pivots around the bolt head 44 so that the bolt element can be secured radially to the telescopic tube.

An alternative embodiment of the securing pin 43 is shown in Fig. 5, which shows a schematic room view of one end of a spacer element 22.

The safety bolt 43 is designed there as a screw connection with a bolt 47 and a nut 48 screwed on the opposite side.

With the help of Fig. 6, which shows a schematic room view of a spacer element 22 suspended on one of the yoke beams 18 with a net 27 suspended on it, the assembly of the slab formwork 1 with the nets 27 attached to it is now briefly explained.

After the yoke beams 18 are placed on the slab props 12, the spacer elements 22 are assembled. For this purpose, the length of the beam element 24, which is designed as a telescopic tube 38, 39, is adjusted first. Then the bearing elements 26 are placed on the beam element 24 by inserting the push-on sleeves 31 into the ends of the telescopic tube 38, 39. Finally, the push-on sleeves 31 and the ends of the telescopic tube 38, 39 are fixed against each other with the safety bolts 43.

The spacer elements assembled in this way are now inserted between the yoke beams 18 and, taking the position of the abovementioned joint areas 20 into account, are positioned on the longitudinal axis 3.

After positioning of the spacer elements 22, a fixing element 49, such as a screw, nail or the like, is driven through the passage opening 32 of the hook front plate 29 into the yoke beam 18 behind it, so that the individual spacer elements 22 are fixed in the longitudinal direction 3 to the yoke beams 18.

Finally, the net 27 is suspended from the retaining elements 33. The net 27 comprises a circumferential outer rope 50, on which several smaller ropes 51, meshed with each other, are held in the interior. To suspend the net 27, the outer rope 50 is inserted into the distance 37 between the two hooks 34, 35 of the retaining element 33, and then inserted into the hooks 34, 35 via the hook openings 36. After this has been carried out for all of the retaining elements 33, the net 27 is suspended and the assembler can walk on the yoke beams 18 to lay the formwork slab.

Reference is made to Fig. 7, which shows a schematic room view of an alternative bearing element 26' of an alternative slab formwork 1' shown in Fig. 8 in a partially assembled state.

The alternative bearing element 26' of the alternative slab formwork 1' comprises a base plate 52, through the centre of which there is a rod assembly passage 53 for a not shown rod assembly stub. On the underside of the base plate 52, viewed in the vertical direction 4, pushon sleeves 31 are fitted on the opposite sides. As on the bearing element 26 of Fig. 2, the push-on sleeves 31 can be connected integrally with the base plate 52. However, in this case the push-on sleeves 31 are not axially but tangentially fitted, and this only over an axial section in each case. On a side radially opposite the base plate 52, the push-on sleeves each have a retaining element 33, which can basically be constructed in the same way as the retaining element 33 in Fig. 2. In the present embodiment, however, the retaining elements 33 are designed as closed eyelets 54 as an example. Furthermore, the push-on sleeves 31 of the alternative bearing element 26 also comprise passage openings 32 for fixing the beam elements 24.

The beam elements 24 already described in Figs. 3 and 4 can be used as beam elements 24.

The alternative bearing element 26' is suitable if the fork element 16 can be placed separately on the slab prop 12. In this case, the alternative bearing element 26' can be held between the slab prop 12 and the fork element 16 as shown in Fig. 8. In this case, the fork element 16 comprises the abovementioned rod assembly stub on its underside seen in vertical direction 5, which is inserted axially at the end into the slab prop 12 through the rod assembly passage 53.

To assemble the alternative slab formwork 1', the slab props 12 can first be connected with the spacer elements 22 and then the yoke beams 18 can be placed on the slab props. The order is random here. A further advantage of the alternative slab formwork 1' is a reduced number of parts, because two push-on sleeves 31 are always arranged simultaneously on a base plate 52.

However, the spacer elements 22 produced in this way can no longer be positioned as required because several spacer elements 22 are mechanically connected to each other by the common base plate 52.

The nets 27 can be attached to the retaining elements 33 in the form of the eyelets 54 in Fig. 8, for example by means of snap hooks.

In principle, the retaining elements 33 could also be attached at any other position of the slab formwork 1, 1'. For example, the retaining elements 33 could be screwed into the yoke beams 18, or held there with other suitable fixing devices. An alternative or additional fastening of the retaining elements 33 to the slab props 12 would also be conceivable, such as ropes or retaining straps.

Claims

Claims

1. Spacer element (22) for supporting two parallel yoke beams (18) of a slab formwork (1) supported on slab props (12) in a transverse direction (4) transverse to the yoke beams (18) and transverse to the slab props (12), comprising a beam element (24) with two opposite end sides on which bearing elements (26, 26') for absorbing transverse forces in and against the transverse direction (4) from the yoke beams (18) are arranged, characterized by retaining elements (33) on the end sides of the beam element (24) for attaching a net (27).
2. Spacer element (22) according to claim 1, characterized in that the retaining elements (33) are arranged on the bearing elements (26, 26’).
3. Spacer element (22) according to claim 2, whereby the retaining elements (33) are arranged integrally with the bearing elements (26, 26’).
4. Spacer element (22) according to one of the preceding claims, characterized in that the retaining elements (33) are suspension elements on which the net (27) can be suspended.
5. Spacer element (22) according to claim 4, characterized in that each suspension element comprises a hook (34).
6. Spacer element (22) according to claim 5, characterised in that each suspension element comprises a further hook (35), whereby the hooks (34, 35) in each suspension element are arranged anti-parallel and at a distance (37) to one another.
7. Spacer element (22) according to one of the preceding claims, wherein the bearing elements (26) can be placed on the yoke beams (18) and can be moved on the yoke beams (18).
8. Spacer element (22) according to claim 7, whereby the bearing elements (26) which can be moved on the yoke beams (18) comprise a fixing point (32) for the application of a fixing element (49) which fixes the bearing element (26) to the yoke beam (18) against displacement.
9. Fall-protection system for a slab formwork (1, 1') comprising two yoke beams (18) running parallel to each other and supported on slab props (12), and two spacer elements (22) supporting the yoke beams (18) in a transverse direction (4) transverse to the yoke beams (18) and transverse to the slab props (12) according to one of the preceding claims.
10. Method for securing an assembler on a slab formwork (1, 1') when placing a formwork slab on the slab formwork (1, 1'), comprising:

- assembling of the slab formwork (1, 1') by erecting slab props (12) and connecting the slab props (12) with yoke beams (18) in a longitudinal direction (3) transverse to the slab props (12), and connecting the slab props (12) with spacer elements (22) in a transverse direction (4) transverse to the slab props (12) and transverse to the yoke beams (18), and

- fastening a net (27) to the erected slab formwork (1, 1') at least halfway up the slab props (12) in such a way that an area spanned by the transverse direction (4) and the longitudinal direction (3), and limited by the yoke beams (18) and the spacer elements (22), is covered by the net (27).

Abstract

The invention relates to a spacer element (22) for supporting two parallel yoke beams (18) of a slab formwork (1) supported on slab props (12) in

5 a transverse direction (4) transverse to the yoke beams (18) and transverse to the slab props (12), comprising a beam element (24) with two opposite end sides on which bearing elements (26, 26') for absorbing transverse forces in and against the transverse direction (4) from the yoke beams (18) are arranged, characterized by retaining io elements (33) on the end sides of the beam element (24) for attaching a net (27).

(Fig. 1)

Claims

1. Spacer element (22) for supporting two parallel yoke beams (18) of a slab formwork (1) supported on slab props (12) in a transverse direction (4) transverse to the yoke beams (18) and transverse to the slab props (12), comprising a beam element (24) with two opposite end sides on which bearing elements (26, 26') for absorbing transverse forces in and against the transverse direction (4) from the yoke beams (18) are arranged, characterized by retaining elements (33) on the end sides of the beam element (24) for attaching a net (27).

2. Spacer element (22) according to claim 1, characterized in that the retaining elements (33) are arranged on the bearing elements (26, 26’).

3. Spacer element (22) according to claim 2, whereby the retaining elements (33) are arranged integrally with the bearing elements (26, 26’).

4. Spacer element (22) according to one of the preceding claims, characterized in that the retaining elements (33) are suspension elements on which the net (27) can be suspended.

5. Spacer element (22) according to claim 4, characterized in that each suspension element comprises a hook (34).

6. Spacer element (22) according to claim 5, characterised in that each suspension element comprises a further hook (35), whereby the hooks (34, 35) in each suspension element are arranged anti-parallel and at a distance (37) to one another.

7. Spacer element (22) according to one of the preceding claims, wherein the bearing elements (26) can be placed on the yoke beams (18) and can be moved on the yoke beams (18).

8. Spacer element (22) according to claim 7, whereby the bearing elements (26) which can be moved on the yoke beams (18) comprise a fixing point (32) for the application of a fixing element (49) which fixes the bearing element (26) to the yoke beam (18) against displacement.

9. Fall-protection system for a slab formwork (1, 1') comprising two yoke beams (18) running parallel to each other and supported on slab props (12), and two spacer elements (22) supporting the yoke beams (18) in a transverse direction (4) transverse to the yoke beams (18) and transverse to the slab props (12) according to one of the preceding claims.

10. Method for securing an assembler on a slab formwork (1, 1') when placing a formwork slab on the slab formwork (1, 1'), comprising:

- assembling of the slab formwork (1, 1') by erecting slab props (12) and connecting the slab props (12) with yoke beams (18) in a longitudinal direction (3) transverse to the slab props (12), and connecting the slab props (12) with spacer elements (22) in a transverse direction (4) transverse to the slab props (12) and transverse to the yoke beams (18), and

- fastening a net (27) to the erected slab formwork (1, 1') at least halfway up the slab props (12) in such a way that an area spanned by the transverse direction (4) and the longitudinal direction (3), and limited by the yoke beams (18) and the spacer elements (22), is covered by the net (27).