DE1920744A1 - Aluminum-steel overhead cable and method for its anchoring - Google Patents

Description

Aluminum-steel overhead cable and procedure. to the tension The invention relates to an aluminum-steel overhead line cable and a method his tension.

The well-known AlSt overhead line ropes consist of a steel core and an aluminum jacket made of stranded round individual wires. These strands essentially have a line contact. A disadvantage of the known ropes can be seen in their low inherent attenuation. This matters insofar as as a result, these ropes tend to vibrate.

The vibration intensity of a conductor is given by the difference between the energy transferred from the wind to the rope and that due to its own damping energy converted into heat.

The invention is based first of all on the problem of the frictional forces between the aluminum wires and thus the inherent attenuation of the rope increases considerably increase. According to the invention, this takes place in the case of a rope as explained at the beginning in that the aluminum jacket consists of at least one layer of a circular segment Consists of single wires (made of pure aluminum or an aluminum alloy), whereby the Individual wires are dimensioned so that the aluminum layer touches the steel core without substantial The space encloses, however, a greater surface pressure of the wires on the Steel core is avoided.

The self-damping of the rope is due to the increased frictional forces significantly increased.

Another part of the invention consists in the method of guying of the rope just described. The procedure is that the aluminum jacket on the braced Sil is relieved.

In a conventionally constructed AlSt rope, the breaking force of the Rope from the breaking strength of the aluminum jacket and that of the steel core determined, which results in a 1 »stretch. This applies because the expansion of the aluminum jacket, if it is clamped to the steel core in a relieved state, the full elongation at break of the steel core does not participate.

In the system which is the subject of the invention this limitation falls gone, since the aluminum jacket only after the steel core has passed the normal load (approx 30, ó the breaking load) with which the steel core is braced.

Since the strain-relieved aluminum jacket acts as a dead load for the Steel core is to be considered, a state is reached, after which the aluminum jacket continuously serves as a damping insert for the steel core, i.e. a reduction the tendency of the AlSt rope to vibrate compared to a steel rope alone will.

In the accompanying drawings, the rope according to the invention is shown in various ways Embodiments shown. There are also ways to brace the rope shown according to the invention, also shown suitable Äbspann-Terminals are. They show: FIG. 1 an overhead cable according to the invention with only one layer the segment-like shaped aluminum profile wires, Fig. 2 a similar rope, but with two layers of profiled aluminum wires, Fig. 3 with another rope one layer of segment-shaped aluminum wires and two further layers of round aluminum wires' 4 and 5 different embodiments for the tensioning of the rope.

In Figures 1 - 3, the steel ropes of the rope are each denoted by 1, while the individual aluminum wires in the shape of a cress segment have the reference number 2. Finally, according to FIG. 3, the additional round aluminum wires are also included 3 designated.

To understand Fig. 4 and 5 the following should be carried out in advance: Due to the construction of the rope described, it is possible that the bracing of the rope can be done solely on the steel core and thus the low friction between Aluminum jacket and steel core provide extensive strain relief for the aluminum jacket becomes achievable. As a result, the breakage gradient in the aluminum dumbbell is very important decreased. What is decisive in the process according to the invention is that the connection between the aluminum jacket and the steel core only takes place after the rope has been installed and after the tensile stress in the aluminum jacket, the CtWG due to inevitable friction transferred to the expanding steel core by sliding the aluminum jacket has largely compensated for the steel core again.

In Figs. 4 and 5 are the steel core with 1 and the aluminum jacket denoted by 2.

The tensioning of the Staillkern: takes place - by the fact that the steel core cast by means of a cone 4 in a steel fork 5 with the aid of a potting compound will. The aluminum jacket 2 is attached to the steel core 1 by means of the aluminum clamp 6 pressed by a hydraulic press. The electrical connection from this Sleeve 6 from onto the current loop (not shown) takes place via a conventional one Screw or press connection.

In Fig. 5 is a mechanical connection 7 between the Aluminum clamp 6 and the steel fork 5 are provided to provide a relief and a To achieve protection of steel core 1 between terminals 5 and 6.

In the figures 4 and 5 adjustable bracing straps 8 are shown, which can be varied in length via screw connections 9 and 10 to to enable fine adjustment of the sag.

The core of the method according to the invention is therefore to be seen in that first the steel core is guyed with the described or similar guy elements and the aluminum jacket is spatially and temporally separated on the already braced Steel core is pressed.

Claims (4)

P a t e n t a n s p r ü c h e aluminum-steel-broad-line cable, characterized in that the Aluminum jacket made of at least one layer of individual wires in the shape of a segment of a circle (2) (made of pure aluminum or an aluminum alloy), the individual wires (2) are dimensioned so that the aluminum layer meets the steel core (1) without substantial The space encloses, however, a greater surface pressure of the wires on the Steel core (1) is avoided. 2) method for tensioning the rope according to claim 1, characterized in that that the aluminum jacket on the guyed rope is relieved. 3) Method according to claim 2, characterized in that the bracing of the rope takes place solely on the steel core, whereby the connection between the aluminum jacket and steel core happens only after the assembly of the rope, after the tensile stress in the aluminum jacket by sliding the aluminum jacket on the steel core has evened out for the most part. 4) Method according to claims 1 and 2, characterized in that that the bracing of the steel core with the help of a cone made of a casting compound in a steel fork is cast L e r s e i t e