DE2237451A1 - METHOD OF WRAPPING A PIPE - Google Patents

Description

Method of wrapping a pipe The invention relates to a method for wrapping a pipe with a plurality of wrapping tapes on the pipe is wound up in the shape of screws.

It is already known to have a tube with a reinforcing wrapping material to wrap, in particular by a variety of metallic Wrapping tapes. The procedure is that the wrapping tapes are wound up one after the other which takes a considerable amount of time and is therefore expensive.

The invention is based on the object of creating a method with the help of which a large number of wrapping strips at the same time in perfect condition Way can be wound. This task is mentioned in the introduction The method according to the invention is achieved in that each wrapping tape is adjoined Edges of successive turns to form a substantially uninterrupted one cylindrical layer is wound up and that all winding tapes are wound at the same time and wound so that the leading edge of all but the innermost winding tape axially backwards offset from the leading edge of the immediately below lying wrapping tape runs up. This creates a tight, prestressed reinforcement winding created and the winding can be applied in a short time. Also will this achieves a maximum reinforcement of the pipe strength.

According to the invention, the adjacent turns abut every day against each other so that each layer is essentially a continuous cylindrical Forming winding, the proportion of the overlap between the winding tapes in one adjacent pair of winding layers is 1 - l / n (1 minus l / n), where n is the number of layers the wrapping is. Therefore, when there are four wraps, they overlap the individual wrapping tapes relative to each wrapping tape of the adjacent layer three quarters of the bandwidth.

Further advantages and features of the invention emerge from the following Description in connection with the drawing, which shows an embodiment of the Invention contains. In the drawing show: Fig. 1 is a diagrammatic View of a tube partially wrapped in metal according to the invention is wrapped, en Fig. 2 is a Nergrósserter partial section along line 2-2 of Fig.1.

In Figs. 1 and 2, a tube is designated 10, which is a metal wrap has a plurality of layers 111, 112, 113 and 114 each one a high Having strength having metallic wrapping tape 11, 12, 13, 14, each Tape forms a layer. The netal wrap strengthens the pipe, increasing the likelihood of pipe ruptures and also prevents the spread of a rupture along the pipe if a break occurs. The individual layers 111, 112, 113 and 114 of the metal wrapping are each made of a single wrapping tape 11, 12, 13 and 14, respectively, which are wound around the tube 10 in a helical shape, whereby the edges of adjacent turns of the individual helical, layer windings butt against each other so that for each layer there is an essentially uninterrupted cylindrical wrapping around the pipe results. The wrapping tapes have one roughly the same width or exactly the same width. Wraps of this type are particularly advantageous for metal pipes with a relatively large diameter, as they are used, for example, as C-a pipes. Breaks in such pipelines are known to extend over great lengths, sometimes over several kilometers, if the pipe is not wrapped. This results in considerable losses. A wrapped pipe according to the illustration can be made by a method or a Device wrapped as described in the simultaneously filed patent application . . . -. . .

{my file: A 39 562 h) is described.

According to an important feature of the invention, several, for example four wrapping tapes 11, 12, 13 14, wrapped around the tube 10 at the same time, being the before; their longitudinal edges of the individual wrapping tapes outside the innermost Layer 111 axially rearward from the leading edge of the adjacent inner one Wrapping tape are so spaced that the individual wrapping tapes on their whole Width during the wrapping. In the illustrated embodiment the radially innermost wrapping tape 11 guides the three outer wrapping tapes 12, 13 and 14. The wrapping tape 12 guides the two outer wrapping tapes 13 and 14 and the wrapping tape 13 leads the outer wrapping tape 14. Before as a result, a certain wrapping tape is placed on the pipe, all the strips underneath are already on the pipe placed so that the separated now placed winding tape is constantly on his the entire width is carried by the wrapping ribbons underneath. Through this there will be any skewing or twisting of the wrapping tapes due to the lack of one completely bearing part prevented. The innermost winding tape 11 has a complete Support, since it is placed directly on the surface of the pipe, but it is important that this wrapping tape is in front of the other wrapping tapes 12, 13 and 14 is placed, so that an empty space below the wrapping tapes 12, 13 and 14 when winding on the pipe is avoided.

The result is that - if one of the wrapping tapes, for example 12, the underlying wrapping tape 11 would run - the wrapping tape 12 not is held more in its entire width when winding on the tube 10. Consequently the non-held leading edge of the wrapping tape 12 would be down and the the trailing rear edge incline upwards. This would then Winding the inner wrapping tape 11 defective. This flawed Winding would be the flat winding of the winding tape 11 on the surface of the pipe 10 hinder, so that now the entire wrapping would be deformed and an evenness the reinforcement would result. The same result would exist if either of the outer wrapping tapes 13 or 14 precedes the respective inner wrapping tape. In the wrapping method according to the invention, however, each wrapping tape becomes flat and evenly wound onto all the wrapping tapes underneath so that an exact and even reinforcement results with certainty.

According to a further feature of the invention. overlap each Metal strips of the wrapping applied to the tube 10 in each case to the neighboring ones Stripes by such an amount that the abutting edges are consecutive Turns of the winding tape in each position axially from the abutting edges successively The turns of the wrapping tapes in all other layers are spaced apart.

In the illustrated arrangement, the wrapping tape overlaps in each of the four layers 1-11, 112, 113 and 114 das, wrapping tape in each adjacent layer 1 - 1/4 or 3/4 of the width of the individual wrapping tapes. This proportion of the overlap can be expressed generally as 1 - l / n, where n is the number of # layers of the Means wrapping on the tube. As a result of the size of the overlap, that the helical connection point as defined by the abutting one another Edges of the individual wrapping tapes is formed, not with the joints any of the other wrapping tapes is aligned and never overlaps these others. A radial one going through the multilayer winding at some point Line therefore never goes through more than one connection point through or, in other words, never by less than three winding layers.

As can be seen from FIG. 2, successive helicals overlap Turns 11a, 11b, 11c and lid of the first layer each have a turn 12a, 12b, 12c of the adjacent layer 12 by 2/3 of the width of the wrapping tape. In a similar way The turns 12a, 12b and 12c overlap the turns lla, leib, llc, lid of layer 11 and turns 13a, 13b and 13c of layer 13 around the same Proportion of. The turns 13a, 13b and 13c overlap the turns 12a, 12b, 12c and turns 14a, 14b, 14c and 14d by the same amount. The turns 14a, 14b, 14c and 14d also overlap turns 13a, 13b and 13c by the same amount is the axial distance between the helical joints of all pairs of adjacent turns constant in all axial directions. For example, if proceeding in the axial direction from left to right according to FIG the distance between the helical abutments of any pair of adjacent ones Layers 1/4 the width of each wrapping tape.

If you proceed axially from right to left, the distance between the helical junctions of any pair of adjacent layers 3/4 of the width of the individual wrapping tapes.

As a result of this novel, multi-layer wrap arrangement is essentially the added strength imparted by the reinforcement wrap Evenly distributed over the entire length of the pipe and over the entire circumference of the pipe. There are therefore no weak areas of the wrapping where the wrapped tube becomes one Fracture is more accessible than in other areas.

Claims (5)

Patent claims: 1. Method of wrapping a pipe, in which a plurality of Wrapping tapes are wound helically on the pipe, d u r c h g e It is not noted that every wrapping tape with abutting edges is consecutive Turns to form a substantially uninterrupted cylindrical layer is unwound and that all wrapping tapes are wound up at the same time and in such a way that that the leading edge of all but the innermost wrapping tape axially backwards offset from the front edge of the wrapping tape immediately below runs up. 2. The method according to claim 1, characterized in that the overlapping Winding up adjacent wrapping tapes is carried out in such a way that the abutting Edges of successive turns of the wrapping tapes of the individual layers axially at a distance from the abutting edges of successive turns of all the rest Layers are. 3. The method according to claim 1 or 2, characterized in that wound so that the proportion of the overlap is 1 - l / n, where n is the number which means layers. 4. The method according to any one of the preceding claims, characterized in that that wrapping tapes of the same width are used. 5. The method according to any one of the preceding claims, characterized in, that wrapping tapes are used, which are made of an elastic metal.