EP0878597B1 - Security-net for persons or objects falling down by construction- or erecting work - Google Patents

Description

The invention relates to a protective net for catching falling People and / or objects in construction and / or Assembly work, - with net made of mesh rope with in essentially rectangular meshes and essentially straight stitch course and edge rope, from stitch to Stitch is drawn through the edge mesh of the protective net, which edge rope for lateral attachment of the protective net is provided on load-bearing structures. - Such protective nets are used as safety nets Prevent people from falling and / or Objects for example in hall and bridge construction as well as in the context of roof work or in tunnel construction used. These protective nets or safety nets are in usually below the jobs to be secured load-bearing structures assembled or fastened. Load-bearing structures mean, for example, scaffolding, Beams and / or beams. The protective nets must be installed regularly certain requirements specified by standards, suffice. The protective nets must on the one hand be functionally reliable be attached or hung. On the other hand, they have to Protection nets also relatively high static and withstand dynamic mechanical loads can. In particular, such a protection network may a body of predetermined mass falling into the protective net the protective net must not be damaged tear. This is done through relevant standards (e.g. DIN 32767) specified the requirements to which such a protection network should suffice.

The above-mentioned protective net has an edge rope which is used for lateral attachment of the protective net to load-bearing structures serves. As a rule, the net is used of rope loops provided at the corner points of the protective net or thimbles attached to a supporting structure. With the edge rope running along the edge of the net the protective net is also on the side of the supporting structure attached or hung. For example, that Edge rope to be hooked into a corresponding hook. Such ropes for lateral attachment of the protective net are safety nets designed to catch falling People are used and a corresponding Have size, prescribed. The edge rope must according to the mechanical ones he may have to absorb Stresses must be designed.

A protective network of the type mentioned at the outset is from DE 19 25 812 A1 known. Here is the mesh rope forming the net edge each with the edge rope along the edge of the net Rigging rigged. Edge rope loops are on the protective nets trained, each comprising a rope thimble. This well-known protection network is in terms of its Stability or in terms of what it can absorb mechanical stresses can be improved.

In practice, a protective network is still the starting point known type known, which has an edge rope, the as it were loose and without further attachment to the wire rope is pulled through the edge of the protective net.

The edge rope wraps around the corners of the protective net Thimbles. To stabilize the known Protection network is also provided with a hoop rope but a nominal diameter reduced compared to the edge rope as well as a lower maximum rope tensile force or minimum rope breaking force having. This binding rope is with the Net edge or with the mesh rope forming the net edge covering the entire edge of the net with rigging yarn umtakelt. Will this well-known protection network comply with regulations suspended or fastened, it suffices the norms given requirements.

Because the protective net on the edge of the network, however, two ropes, namely the edge rope on the one hand and the binding rope on the other hand, it often happens that this Known protective net from the assembly staff defective is hung up. Such errors when hanging or fastening of the protection network occur in particular if the Assembly personnel accidentally replaced the binding rope instead of the Edge ropes attached to a supporting structure. The binding rope is for the mechanical stresses that the Edge rope has not been designed. So far it can failures of the fall arrester come when body heavy weight hit the protective net and this damaged or even damaged by the faulty suspension interrupted. For the rest, the well-known protection network is in manufacturing technology only relatively expensive producible and stands out the known Protection net from relatively high material costs.

In contrast, the invention is based on the technical problem to specify a protective network of the type described at the outset, that functionally reliable and to the exclusion of assembly errors can be fixed by a relative characterized by a less complex production method and nevertheless meets all mechanical requirements.

The invention teaches to solve this technical problem a protective net to catch falling people and / or objects during construction and / or assembly work, - With a net made of wire rope with essentially rectangular meshes and essentially straight Stitch course and an edge rope that goes from stitch to stitch is pulled through the edge mesh of the protective net which Edge rope for lateral fastening of the protective net load-bearing structures is provided, which the Mesh rope forming net edge each with the edge rope over essentially rigged the entire net edge with rigging yarn is, the edge rope on the protective nets free of punctures is connected to the corner stitches and being on the Protective nets edge rope loops are formed, which Edge rope loops each include a rope thimble and the stitch rope together the corner stitches of the net is attached to the thimble with the edge rope. - The edge rope is in terms of its nominal diameter and with regard to the minimum rope breaking strength so that it the required mechanical resilience parameters are sufficient. The minimum rope breaking force is preferably Edge rope 30 kN.

According to the invention there are various options for further training and design of the protection network. The mesh size is preferably square Mesh of the net 45 to 200 mm, preferably 50 to 100 mm. It is expedient for the net to be braided Mesh rope made of polyamide used. Preferably the net consists of mesh rope with a nominal diameter from 2.5 to 6 mm, preferably 3.5 mm. According to the invention can be knotted or woven his.

The edge rope is preferably a twisted one Rope, which is preferably made of polyamide. According to preferred Embodiment of the invention has the edge rope a nominal rope diameter of 10 to 16 mm, preferably 12 mm, on. According to the network edge with the Edge rope preferably with rigging yarn over the entire network umtakelt. The stitch rope of an edge stitch of the net cloth and the edge rope are at least 15 to 35 times wrapped with rigging thread.

As above in the description of the known measures has already been mentioned, it is so far from the state of the Technology for safety nets, especially for catching falling People, only known, the edge rope loose to pull through the edge of the protective net without any other fastenings or Knots are provided. With these known safety nets the net cloth must be added to the edges of the net be stabilized, especially with an additional one Binding rope, as described above with the mesh rope of the net edge is umtakelt. The invention is the Understanding that the edge rope, as it were, both tasks can meet. On the one hand, the protective network or Safety net with its net edge or with that in the net edge integrated edge rope on load-bearing constructions functionally secure. Assembly errors that occurred at the known safety nets mentioned at the beginning are common are as good as in the safety net according to the invention locked out. In addition, the edge rope takes over on the other hand the task of edge stabilization of the net cloth and its mesh or that arranged on the net edge Mesh rope. Through the switching or intimate and firm Connection of the mesh rope on the net edge to the edge rope the mechanical strength of the Edge ropes considerably increased. With known protective networks or safety nets are usually except on the Protective nets also at the edges of the rope loops or Thimbles are provided at certain intervals. These additional Rope loops or thimbles are in the inventive Protective net is not necessary and it is enough out, this protective net with the edge rope on stable Fasten constructions. Nevertheless, that is enough protection network according to the invention all mechanical requirements, why refer to the explanations below becomes. Because only one rope, namely the edge rope is incorporated into the edge of the protective network, is the invention Protection net in the result with little effort produced. The feature according to which also contributes to this the edge rope on the protective nets with no punctures Corner stitches is connected. This characteristic means that none Punctures between the stitch rope of the corner stitches on the one hand and the edge rope on the other hand for connecting the two ropes are realized with each other. It understands themselves that such punctures and an associated Pulling the ropes through time-consuming manufacturing require. In known safety nets is the Protective nets the edge rope through a puncture with the Corner stitch connected. Such elaborate punctures are not required according to the invention and the edge rope is therefore on the protective nets without puncturing with respect to Corner mesh of the net cloth executed. Preferably too the edge rope in the area of the safety nets without Pierced and is therefore not the edge rope as it were pulled through his own rope body. The edge rope is therefore expedient in the area of the Protective nets run completely without punctures. Nonetheless the protective network according to the invention is sufficient mechanical loads specified by standards, why refer to the embodiment below becomes. According to the invention, edge rope loops are on the protective nets trained, which edge rope loops each in border a rope thimble. The thimbles are preferred executed on the protective nets as metal thimbles. According to a preferred embodiment of the invention the edge rope loops arranged in the thimbles Rigging rigged. This will make the edge rope loops and the thimbles particularly firm and reliable in held their assigned position. Add to that further according to the invention in that after more preferred Embodiment the mesh rope of the corner stitches of the net together with the edge rope and the rope thimble of a corner string are cross-tacked, which corner string is preferably designed as a hollow braid.

According to the invention, the size of the protective network is preferably in the range from 4 mx 4 m to 20 mx 35 m, preferably 5 to 10 m x 5 to 20 m. There are four each Edge rope loops on the four safety nets assigned thimbles, preferably metal thimbles, intended.

Fig. 1

eine Draufsicht auf das erfindungsgemäße Schutznetz,

Fig. 2

den Ausschnitt A aus der Fig. 1 in wesentlich vergrößertem Maßstab,

Fig. 3

den Ausschnitt B aus der Fig. 1 in wesentlich vergrößertem Maßstab.

The invention is explained in more detail below on the basis of a drawing which represents only one exemplary embodiment. They show a schematic representation

Fig. 1

a plan view of the protective network according to the invention,

Fig. 2

the section A from FIG. 1 on a substantially enlarged scale,

Fig. 3

the section B from FIG. 1 on a substantially enlarged scale.

Fig. 1 shows a protective net 1 for catching falling People and / or objects in construction and / or Assembly work. The protective net 1 has a net cloth 2 Mesh rope 3 with essentially square meshes and essentially straight course. It is still an edge rope 4 is provided, from stitch to stitch is pulled through the edge mesh 5 of the protective network 1, which edge rope 4 for lateral attachment of the Net edge 6 is provided on load-bearing structures. From stitch to stitch through the edge stitches 5 means that the edge rope 4 alternately the edge stitch legs 8th covered or underclassed. In the exemplary embodiment, this Edge rope 4 has a nominal rope diameter of 12 mm. The Edge rope 4 can be used for lateral attachment of the net edge 6 for example, be hooked into appropriate hooks.

In particular in Figs. 1 and 2 it can be seen that the Mesh edge 6 forming mesh rope 3 each with the Edge rope 4 with essentially the entire net edge 6 Rigging 7 is umtakelt. The mesh rope 3 is one Edge stitch 5 and the edge rope 4 between two edge stitch legs 8 at least 15 to 35 times with the rigging thread 7 entwined. In the cutout in Fig. 2 is indicated that the mesh rope 3 forming the net edge 6 the edge rope 4 preferably over the length of the net edge 6 wraps.

The edge rope 4 is puncture-free on the protective nets 9, especially with regard to the corner stitches 10 of the net cloth 2, executed. There are 9 on the protective nets Edge rope loops 11 formed, which edge rope loops 11 each comprise a rope thimble 12. In the embodiment are the thimbles 12 as thimbles executed. 3 can be seen that the Corner stitch 10 of the net cloth 2 together with the edge rope 4 and the rope thimble 12 with a hollow braid cord executed corner string 13 are cross-tacked. This makes it particularly effective and reliable Stabilization of the protection network and in particular the protective nets 9 achieved. 3 one can see furthermore that arranged in the thimbles 12 Edge rope loops 11 are rigged with rigging yarn 7. Thereby the edge rope loop 11 and the associated Rope thimble 12 held securely in place.

The invention is described below using an exemplary embodiment explained in more detail:

Embodiment:

There was a protective net with a nominal size of 7 mx 5 m used, the square mesh with a mesh size of 100 mm and essentially a straight course. Edge rope loops and assigned metal thimbles were only in the four cornerstones of the protection network intended. The mesh rope of the net consisted of Polyamide and was braided and had one Nominal diameter of 3.5 mm. The linear breaking strength of the Mesh rope was 4.9 kN, the breaking force overhand knot was 2.7 kN. A twisted rope was used as the edge rope used as a 3-strand rope with eight rope yarns each strand was made. The edge rope made of polyamide pointed a nominal diameter of 12 mm. The minimum rope breaking force the edge rope was above 30 kN. It became a Rigid polypropylene thread used. The Andes The protective cord provided for the corner cord was as Hollow braid cord executed. The length of the double laid hollow braid was about 2.8 m.

The protection network was designed according to the requirements DIN 32767 (1984), point 4, checked.

First, the static load capacity according to DIN 32767 (1984), point 5.4. The protection network was created with the rope thimbles arranged on the protective nets. There was a preload of 0.5 kN in the corner points applied. The side lengths of the prestressed network were 4.85 m and 4.95 m and 7.05 m and 7.06 m. The Sag at the deepest network point was 53 cm. to A test ball was used to test the static load capacity placed in the protective net with a mass of 150 kg. at with a network load of 1.5 kN there was a sag the protective network of 1.83 m. The protection network absorbed energy was 1.37 kNm. One on the ball The force acting vertically downwards was infinitely variable applied at a loading speed of 100 mm / min and the energy absorbed by the grid was running determined electronically. With a network load of 14.1 kN the sag of the protective net was 3.17 m. The ones from Protective network absorbed energy had a value of 8.83 kNm. The total of the total absorbed by the protection network Energy was therefore 10.20 kNm. There were none Damage to the protective net found.

Then the test of dynamic resilience was carried out according to DIN 32767 (1984), point 5.1. The above test ball with a weight of 150 kg from a drop height of 6.8 m in the middle of the protective net dropped. The drop test was carried out three times. In all three drop tests, the ball was held and No damage to the protective network was found. In particular, there was no visible damage to the Rigging yarn, mesh rope and edge rope in the area to watch the corner stitches. The maximum sag of the Protection network was smaller than in all three drop tests 3.75 m.

The test results shown above show that the protection network according to the invention as required by the standards mechanical stresses surprisingly equivalent.

Claims (9)

1. A catch net (1) for catching falling persons and/or objects during construction and/or assembly work,

   comprising
      a net cloth (2) made of mesh rope (3) having essentially rectangular meshes that are aligned in an essentially straight manner, and
      a border rope (4) that is pulled from one mesh to the next through the border meshes (5) of the catch net (1), which border rope (4) is provided for laterally attaching the catch net to portative structures,

   wherein border rope loops (11) are formed at the catch net corners (9), which border rope loops (11) respectively comprise a rope eye (12)
   characterised in that
   rigging yarn (7) is rigged around the mesh rope (3) that forms the net edge (6) respectively with the border rope (4) over essentially the entire net edge (6),
   the border rope (4) is connected at the catch net corners (9) to the corner meshes (10) without holes from stitching, and
   the mesh rope (3) of the corner meshes (10) of the net cloth (2) together with the border rope (4) is fastened to the rope eye (12).
2. The catch net according to claim 1 wherein the mesh width of the net cloth (2) is between 45 and 200 mm, preferably between 50 and 100 mm.
3. The catch net according to one of claims 1 or 2 wherein the net cloth (2) consists of mesh rope (3) having a nominal diameter of between 2.5 and 6 mm, preferably 3.5 mm.
4. The catch net according to one of claims 1 to 3 wherein the border rope (4) has a border rope diameter of between 10 and 16 mm, preferably 12 mm.
5. The catch net according to one of claims 1 to 4 wherein the rigging yarn (7) is wound round the mesh rope (3) of a border mesh (5) and the border rope (4) at least 15 to 35 times.
6. The catch net according to one of claims 1 to 5 wherein the rope eyes (12) are designed as metal eyes.
7. The catch net according to one of claims 1 to 6 wherein the rigging yarn (7) is rigged around the border rope loops (11) that are arranged in the rope eyes (12).
8. The catch net according to one of claims 1 to 7 wherein a corner string (13) is rigged crosswise around the mesh rope (3) of the corner meshes (10) together with the border rope (4) and the rope eye (12).
9. The catch net according to claim 8 wherein the corner string (13) is designed as a hollow interwoven string.

Images