Tension rod system
A tension rod system (also an eye rod system ) are rope-like constructions made of individual metal rods that form movable connections with a bolt. They are often used in chain bridges .
Tension rod system
A tension rod system is a rope-like connection that consists of two fork heads with internal threads and a round rod, which is provided with external threads at the ends. Since the tension rod has a right and a left thread , the tension rod system can be adjusted or tensioned by turning the central rod. There are various systems on the market that cover a range of thread dimensions from M 6 to M 160 . The possible lengths range, depending on the diameter and the steel grade, up to over 20 meters. The thread ends can also be extended as required using sleeves and turnbuckles . The articulated connection to a structure is made using bolts that are inserted through the fork head transverse holes and a hole in the connection plate. Optionally, the protruding part of the thread can be covered by cover sleeves.
Such systems are used as wind bracing, bracing, bridge hangers and suspensions.
Occasionally, tension rods are only attached using nuts and washers or washers. This rigid solution - like a welding solution - does without a joint effect, which, however, can often lead to fatigue damage, particularly in the case of dynamically loaded structures. This must be taken into account in the long-term economic analysis.
Eye stick system
An articulated alternative design to the fork head system is often the more economical eye rod system - especially with larger dimensions. Here the rope-like connection consists either of a double eye rod for fixed lengths or, if an adjustment option is required, of two eye rods. An eye rod is a complete metal flat rod or a round steel forged flat at the end with a bolt hole (called "eye"). This rod has a right-hand thread and the second a left-hand thread. The tension is adjusted by means of a central turnbuckle, which can be turned more easily than a long rod in a fork head tension rod system. The connection to a building is made via two parallel web plates with holes, between which an eye is inserted and connected with a bolt.
literature
- Zi-Niu Guo-Geruschkat: Eye stick-bolt connections taking friction into account. (Online Resource, PDF, 5527 KB), Univ. Hanover, Department of Civil Engineering and Surveying (Ed.), 2001 Hanover, 228 p., Technical dissertation
Individual evidence
- ^ Meyers New Lexicon in eight volumes. VEB Bibliographisches Institut Leipzig, 1964/65; Volume 1, page 490