Apparatus for guiding metal strips over rollers in treatment and wrapping plants, includes arrangement of angularly movable roller bearings, bushes and half axles to correct eccentric running of the strip

The invention concerns a procedure for fastening a Abdlchtungsfolie from plastic on a Urtterlage, in particular a Tunrtelwandung, with which at the document retaining bodies made of plastic are attached and afterwards the plastic foil which can be brought in is fastened at the retaining bodies by welding. Further the invention concerns a retaining body particularly suitable for the Dttrchführung of the procedure. S with a well-known procedure for fastening a plastic foil, like it e.g. in the German Offenlegungsschrfft 1658883 or in “Straßenund foundation engineering” 6/1970, S.497 and 498 and/or Girnau and Haack “Tnnnelabdichtungen”, Alba book publishing house, Duesseldorf 1969, S.47 to 51 as well as 183 is descriptive, plastic-coated metal plates on the document is fastened and the plastic foil moved over it by means of electrodes produced Hochffequenzfeldes pressed between the metal plate working as auxiliary electrode and the faces of against the foil welded. Unfavorably with the well-known procedure it is first that nevertheless plastic-coated Metallplattert comparatively complex which can be manufactured must be used. Further it showed up that an even VerschwelBung between the plastic-coated metal plates and the foil can be only heavily obtained, in particular, if in the Turmelbau membranously arising humidity üb.rt to Krlechströmen. Finally trained high frequency welding sets are necessary for the execution of the well-known procedure in special way. From österr. Godfather RTT writing Nr.315232 is well-known a procedure of the genericin accordance with-eaten kind, with which the retaining bodies are trained as strips from thermoplastic plastic, with which the Abdlchtungsfolie is welded. When to the Tunnellelbung anzusehießende, square PVC plates are trained retaining bodies, with which the sealing foil existing made of PVC is to be verschwelBen, likewise already suggested (see “Banmaschlne and civil engineering” 17.Jahrgang, 1970, number 9, S.377 to 379). With another, from the German Offerdegungsschrift 2305904 well-known procedures before the creation of the foil a number of nails, which each exhibit one flat head provided with plastic, into the cliff are driven and welded the foil afterwards to the plastic-coated Nägelköp£e. Tears arise according to experience in the Abdlchtungsfolie with higher water pressure because of the tensions arising within the range of the nail heads. The moreover sealing foils are well-known from the Swiss patent specification Nr.515387, which on that the Turmelwand course-turned side glued to, welded or along-extruded fastening parts, like latches od.dgl, exhibits. These fastening parts are to be hailed with applying the Abdlchtung to the cliff or hung up in MetaUgltterelemente, which are attached at the cliff. With this procedure however disadvantages insoferne arise; as with the attachment of the foil with such Befestigungselemertten between it and the tunnel wall an appropriate manipulation area to be kept must, what as a consequence has that the foil remains strongly relocatable opposite the cliff. Thus the foil is pressed elsewhere with applying the interior concrete not within the range of the latch reinforcement to separate against the unprotected nail heads, which leads again to injuries and Undächtigkeiten. If the fastening parts are hung up in a before anfgebrachtes Maschengkter, it comes with applying the interior concrete frequently to breaks in the metal lattice. The BruchsteUen of the Gitterdrahtes arising thereby leads to penetrations of the seals foil. Another well-known procedure (German disclosure writing 2026675) avoids the disadvantages it before to the tunnel wall by means of nails fastened Metal! lattice, in which it replaces this lattice by a raster from plastic volumes. Nevertheless also this procedure does not have itself in practice proven, waves the foil unprotected the heads of the used metallic fastening parts suspended is also here and the attachment of the foil at the plastic volumes contrary to the invention no being harmless for the plastic foil exhibits. With all well-known it procedure-comes again and again forwards that the sealing foil is stretched when bringing in the ertdgültigen local concrete between the Befestigungstunkten so much that it tears up. This is unfavorable insoferne, when the sealing effect desired is then impaired. The invention made it's duty to form a procedure of the initially mentioned kind and hiezu usable retaining bodies in such a manner further that the possibility of tearing the plastic foil up is avoided when bringing in the final local concrete and/or “Vorsatzbetons” after possibility. This task according to invention thereby solved that a firmness of the weld between retaining bodies and plastic foil is herbeigerohrt, smaller is than the ultimate tensile strength of the Kurtststoffolie used in each case. An advantage of the erFmdungsgemäßen procedure is in that retaining bodies at will formed can be used. A further substantial advantage is to be seen in it that with the procedure according to invention a weld between retaining bodies and plastic foil is caused, their firmness is smaller than the RelBfestigkeit of the plastic foil. This drives to it that itself the plastic foil, e.g. with applying the final local concrete and/or “Vorsatzbetons”, which the plastic foil against the document presses, whereby this, in particular, is stretched if larger unevenness of the document are present, from individual or several retaining bodies solves, before she tears up, whereby the plastic foil is stretched over a larger range. Thus so far frequently arising tearing of the seals foil, if their ultimate tensile strength is exceeded with iii-no printings in unevenness, is avoided. The relationship between the ultimate tensile strength of the plastic foil and the firmness of the Schwelßung will be selected depending upon the dominant circumstances. In the context of the invention it proved as particularly favorable, if the firmness of the weld is selected in such a way that the ultimate tensile strength of the plastic foil used in each case doppdt about, preferably 2,5mal is so large. A further advantage of the procedure according to invention is in it that with commercial welding sets can be worked, this in particular if, as in accordance with a variant the invention intended, one welds the plastic foil with the retaining body thermally, whereby the necessary warmth is supplied by means of HeizBluftföhn or electrical welding set. Causing erfmdungsgemäß intended firmness conditions of the weld is substantially facilitated by in the context of the invention the suggested retaining body for the execution of the procedure. According to invention suggested the retaining body consists of the same plastic as the plastic foil, preferably made of polyvinyl chloride, which can be fastened, PL, polypropylene, and is characterised by that it contains a schwelBungserschwerenden additive. Preferably the weld-making more difficult additive is contained only in that of the plastic foil course-turned range of the retaining body. As weld-making more difficult additives has themselves 10 to 30 Gew. - works % pulverized mineral materials, in particular chalk, particularly. In place or in addition of the weld-making more difficult additive of the material of the retaining body it can be still intended that those course-turned the plastic foil surface of the retaining body rounded off ribs or burls carries. Thus the surface of the weld between foil and retaining body is made smaller and firmness conditions according to invention aimed at to leave easily to cause itself. In the following the invention on the basis the example of use represented in the designs more near described • it to show Fig.1 a section of one over retaining bodies at a document fastened plastic foil, Fig.2 the section from Fig.1 after applying Vorsatzbeton. Below the attachment of the plastic foil by the example of a tunnel isolation is described. First the TunneIröhre becomes on those --10-- zugekebrte surface of the rock --1-- a spraying concrete layer applied. Over this spraying concrete layer a protective layer from fleeces or regenerator foils is applied. The protection-laminated --3-- can for example with the help of the retaining bodies --4--, those by attachment nails --5-- at the rack --1-- and/or the spraying concrete layer --2-- are fastened, to be specified. Over the retaining bodies --4-- becomes the plastic foil --6-- put, which consists e.g. of several welded with one another foil courses. The foil courses of connecting welding seams are to possess the same ultimate tensile strength as the foil. As foil material work satisfactorily in particular polyvinyl chloride, PL or polypropylene, with a thickness of approximately 1.5 mm and a RelBfestigkeit (DIN 53455) from approximately 140 to 190 kp/cm2. Beside the usual softeners and fillers as well as stabilizers the plastic foils can possess a flame-restraining and/or fungicides equipment. The retaining bodies trained as strips, plates or disks --4-- consist favourable-proves of the same plastic as the plastic foil --6--. As weld-making more difficult additives, which are contained of the plastic foil zugekehrtem range in the retaining body, in particular in its, pulverized mineral materials, in particular, know chalk in a quantity from approximately 10 to 30 Gew. - % to be used. The retaining bodies --4-- it can whether they contain now schwelBungserschwerende additives or not, at that of the plastic foil --6-- surface ribs or burls course-turned exhibit, which possess rounded off edges with advantage. By these ribs or burls the surface, at which a weld between plastic foil and retaining body takes place, reduced, so that it is possible, within the range of the weld the plastic foil --6-- of the retaining body --4-- to solve, without with it the ultimate tensile strength of the plastic foil --6-- to exceed. To welding the plastic foil --6-- with the retaining bodies --4-- all welding sets are usable, which are suitable for thermal welding. Preferably hand foehn or electrical ScSehweißgeräte is used. The welding temperatures lie between 160 to 200°C, whereby appropriately the plastic foil --6-- during the welding procedure against the retaining body --4-- one presses. That a weld between retaining bodies and plastic foil is caused, their firmness is substantial is smaller than the ultimate tensile strength of the plastic foil --6--. The Relßfestigkelt of the plastic foil behaves to its detachability of the retaining body --4-- for instance between 1: 0,7 to 1: 0,2. Values are preferential around 1: 0,4 to I: 0,5. Over in this way thermally with the Haltekörpem --4-- welded plastic foil ---6--- becomes now e.g. with the help of a scarf car under pressure Vorssatzbeton --7-- applied. Thus the plastic foil becomes --6-- and also the protection-laminated --3-- against the spraying concrete layer --2-- and/or the rock --1-- pressed, as this is shown in Fig.2. The plastic foil becomes --6-- more or less strongly long. Would be now the plastic foil --6-- with the retaining bodies --4-- very firmly connected, then danger exists that the plastic foil --6-- , where it is stretched very much, e.g. within the range --8--, it tears whereby the desired sealing effect of the plastic foil was not obtained. With application of the procedure according to invention for fastening the plastic foil --6-- at the retaining bodies --4-- this danger does not exist any longer. When bringing in the Vorsatzbetons the Kunststoffolle becomes --6-- of to the range --8-- adjacent retaining bodies --4-- solve, so that the stretch of the KunststoffoHe --6--, if these into the recess within the range --8-- one presses in, by a larger range the same to be made can. Thus the plastic foil becomes --6-- less strongly long and this becomes also with large unevenness in the rock 1-- no more do not tear up.