Edit post

Edit your reply below.

Post Body
Enter your post below.
[quote user="RME"]You're getting carried away.[/quote] Really? You choose the joint spacing so that the tensions from hampered temperature contraction don't exceed the tensile strength. And yes the spacing is about 25''. That is what I meant in my last post. In a foreign language you always what you want to say but never can be sure if you really wrote it. The tensile strength of a good composed concrete can reach 10% of the compressive strength. [quote user="RME"]What MC is discussing is not so much a tendency for the slabs to 'pull apart' as for the structure as a whole to stringline.[/quote] How shall slabs with grouted joints stringline? Or do I understand stringlining differently than you? In the Boegl drawing you see #8 GEWI steel. That is a threaded reinforment steel similar to Lenton steel. GEWI has a cylindrical coarse thread, Lenton a conical fine thread. The corresponding GEWI steel of two slabs are coupled with turnbuckles and nuts (#10) according to the drawing on page 7. The two grouted recesses act as dowels for transverse forces. Prestressing is only in transversal direction. The subgrade is a hydraulically bound layer upon a compacted frost protection layer. The slab are erected with a 3cm (1.2'') wide joint which is poured from above with a bitumen-cement grout. When pouring the concrete only the dowels for the rail fasteners are inserted into the steel formwork (page 15, picture top left). The fasterner seats are digitally CNC processed for the required rail fastener and the fastener assembled on the slab. The slabs are stored with the rail fasteners assembled. On page 5 you can see that the rail seat is already profiled in the formwork. There are only last adjustments necessary. Boegl only gives the requirements for the subroadbed not the measures. By the way Boegl designed and produced the precast concrete elements including the Guideways for the maglev train from Shanghai to the airport. Regards, Volker
Tags (Optional)
Tags are keywords that get attached to your post. They are used to categorize your submission and make it easier to search for. To add tags to your post type a tag into the box below and click the "Add Tag" button.
Add Tag