Tinst means “Installation Torque” which is applied on the bolts during the nut tightening process. Maximum allowable values for the Tinst corresponding to the each profile type, bolt diameter and grade of T-bolt are given in the European Technical Assessment (ETA-09/0338) annex B7.
If T-bolts are highly overtorqued the bolt material can be overstressed and can also damage the channel lips and will cause reduction in the load carrying capacity. On the other hand, if Tinst applied is less than the specified value which can cause the movement in the fixture. Therefore, JORDAHL recommends to use the given installation torque values as a guideline for installation.
Yes, with JORDAHL® hot rolled anchor channels it is possible to take small to medium loads along the length of the anchor channels. Then instead of using the Hook-Head or Hammer- Head bolts, special double notched toothed bolt types JKB and JKC should be used. The installation torques of these bolts are higher creating a groove inside the channel lips thereby enhancing its load carrying capacity along the longitudinal direction of the anchor channel.
For the selection of suitable anchor channels, the various corrosive conditions must be observed at the site. An overview of the applications and appropriate materials is shown in the European Technical Assessment ETA-09/0338. For stainless steels there is a difference between applications with high corrosion, such as corrosion in areas exposed to weather and near the seaside and with very high corrosion applications e.g. because of chlorides and sulphur dioxides such as lroad tunnels.
Since the beginning of 2011 the JORDAHL GmbH offers a user-friendly software for free download. This facilitates users to switch from the previous rigid design according to tables on a flexible design according to ETA.
The design for the new ETA, in conjunction with the TR 047 offers the user the exact knowledge of the safety of fastenings (e.g. in cracked or uncracked concrete) and a various other advantages. Thus, anchor channels can be calculated with different concrete strengths in the future, used with smaller edge distances, can be designed for any load positions and reinforced with stirrups. The existing conditions can thus be considered more accurate and provide a technically and economically optimized design of anchor channels.