06:54AM | 02/23/03
Member Since: 02/22/03
2 lifetime posts
2-3 years ago I saw a system on A Bob Vila show wherein tension cables were embedded in a concrete slab to strengthen it and prevent breaking/cracking on un-stable ground. I really need to track down this system to re-pour the slab under my house. Can anyone please tell me whay the system is,and more important how to find the manufacturer/dealer to get info on it.
Thanks In advance ... Gary


10:30AM | 02/23/03
Member Since: 01/14/03
265 lifetime posts
Concrete works quite well in compression, holding up a load directly above it, but by itself it doesn't work well at all in tension, the forces exerted by bending and pulling. In order to make a slab that could span a certain distance without the normal "frame" designed into it on the bottom side, engineers came up with the idea of embedding steel cables in conduit in slabs to compensate.

Basically, the cables and conduit are formed in the concrete slab as if they're held at both ends, with the middle part hanging in a curve as gravity would form it, but all parts are within the limits of the slab. As the slab cures, one end of each cable is anchored in the slab, and the other end is pulled (in tension) by a machine made specially for the purpose. Engineers calculate the necessary tension under which the cables need to be stretched before the pulling end is also anchored. The theory is that the upward forces provided in the slab by the curved cables, now stretched under tension, will counteract the downward forces of gravity and the weight of the concrete when the slab is installed with supports only on the ends, and not under the entire a bridge.


10:12PM | 02/23/03
Member Since: 02/22/03
2 lifetime posts
Thanks for your explanation. Do you happen to know who makes/distributes the equipment and cables for this system ?


05:48AM | 02/24/03
Member Since: 01/14/03
265 lifetime posts
Sorry, I've never had the need to look for a contractor who could do that, or a establishment that could provide the equipment. But if I had the need, I might start by calling the closest ready-mix concrete company. They might not have the know-how, but they might be able to give you a lead.


12:56PM | 03/26/03
Member Since: 10/15/02
359 lifetime posts
They built a huge house and used this design for the slab. There may be info on that site.


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

If you are interested in more about fans and air conditioning, consider: How To: Install a Ceiling Fan How To: Choos... It turns out that many bath and kitchen cleansers contain chemicals that are dangerous to the skin and eyes, and often pro... So often we paint tiny nooks white to make them appear larger, but opting for a dark, dramatic wall color like this one—Be... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon