Longitudinal rope connection

from Wikipedia, the free encyclopedia

A longitudinal rope connection is a way of connecting wire ropes together. With wire ropes, the rope ends tend to fray and must not be knotted together for safety reasons. Special tools are required to securely connect wire ropes.

Types and execution

The connection of wire ropes can be done in different ways. In order to connect wire ropes effectively with each other, there are the methods of U-clamp connection, thimble connection, splicing and rope sock. The welding of longitudinal rope connections, the so-called butt welding, has not proven itself in terms of safety. Welding reduces the breaking strength of the rope at the welding point by 80%. In addition, the bending behavior of the rope after welding is difficult to calculate.

U-clamp connection

With the U-clamp connection, the two rope ends are overlapped lengthways and then screwed together using U-clamps . The length of the rope overlap and the number of U-clamps depend on the rope load and the nominal rope diameter. At least four rope clamps are required for thin sling ropes. For ropes with a larger nominal rope diameter, up to six clamps are attached. For safety reasons, the nuts of the rope clamps are screwed on using a torque wrench.

Thimble connection

With the thimble connection, a rope end connection is first created at the two rope ends to be connected by means of a thimble binding . These two thimble bindings are connected to each other using shackles or turnbuckles. In this way, rope locks or cast rope sockets can also be connected to one another.

Splice

With this longitudinal rope connection, both rope ends to be connected are first braided and then the individual strands are braided with one another using special techniques. Using spliced ​​connections in accordance with regulations, wire ropes provide good power transmission and a high level of safety. However, good technical knowledge is required to create a splice connection. Ropes with different lay directions must not be spliced ​​together. Splice connections are e.g. B. used in floor railways. They are unsuitable as a permanent connection with a vertical pulling direction, as the load can rotate when a single rope is loaded. This rotation opens the splice. Are spliced ​​ropes z. B. used as lifting gear, the rotation of the load must be prevented.

Rope stocking

Rope stockings, also known as rope connection stockings, are tubular structures made of individual ropes. They are used where old ropes are to be exchanged for new ones. To pull in the new rope, the rope stocking is pushed over the ends of the ropes to be connected. If one of the ropes is now pulled, the stocking will lengthen. During the elongation, the cross-section of the stocking is reduced and the connection is created by the frictional forces that build up. However, there must not be any great torsion on the ropes . As a result, the rope socks enable a longitudinal rope connection that can be quickly established and that is absolutely non-positive in use. The connection can be released just as quickly. With lang's lay ropes it can happen that the rope sock can twist off like a nut on the screw , despite the lacing tension . By wrapping the ends of the rope with strong adhesive tape , the adhesion of the stocking is increased. This prevents the rope sock from slipping. The advantages of the rope sock are its short assembly time, its reusability and its low weight. Rope socks are used to pull in new haulage ropes in mining , on crane systems and on cable cars.

Individual evidence

  1. ^ A b c Karl-Heinz Wehking: Running ropes. 3rd completely revised edition, Expert Verlag, Renningen 2005, ISBN 3-8169-2497-2 .
  2. ↑ a b c d e f g Reinald Skiba : Taschenbuch Betriebliche Sicherheitstechnik. 3rd edition, Erich Schmidt Verlag, Regensburg and Münster, 1991, ISBN 3-503-02943-5 , pp. 361-363.
  3. ↑ a b c Bernhard Kleinemeier: rope connections, rope end connections. In: Verein Deutscher Revisions-Ingenieure EV (Ed.): Yearbook 1966, Bremen December 1966, 49-55.
  4. ↑ a b c d e Richard Meebold: The wire ropes in practice. Springer-Verlag Berlin Heidelberg GmbH, Berlin 1938, pp. 39-45.
  5. ↑ Verope (ed.): Handling and inspection. Design by Wickert Medien GmbH, Switzerland 2008.

Web links