NEW VERTICAL SLIP FORMING TECHNIQUE UTILIZING CEMENTS THAT WILL DOUBLE THE SLIP RATE WHILE CUTTING COST AND MANPOWER
Slip forming has been the fastest construction method for high-rise concrete structures since its invention some seventy years ago in Sweden by Bygging-Uddemann. They are now the largest in the world.
Slip forming’s other strong suite is it’s the safest method of forming since the formwork is only assembled once at ground level.
DOUBLING THE SLIP FORM RATE
Setting time of concrete depends on temperature. This can be achieved by a new type of cement used in the concrete. Seven years ago, a company in Houston Texas called Geopolymer Solutions, LLC invented this cement (binder) for concrete called Cold Fusion Cement (CFC). This company, now with its new cement for concrete, obtained a patent entitled “Method of making construction materials with a voltage.”
In order to meet passive structural steel fireproofing code requirements, there are a number of methods available.
NEW LOW VOLTAGE CFC PRONE CONCRETE
When electricity is passed through CFC the electrons are excited and the concrete cure begins. As the concrete passes the electrical input sources on the forming panels its conductivity will start to cure the mixture while seeking parts of the mix it has not cured. This heat input is assured by the second set of voltage inputs in the bottom third of the forming panels.
OTHER FACTORS THAT WILL SPEED THE SLIP
The CFC is a high slump material that will require fewer concrete placement positions. The CFC mix design will have no air entrainment or vibrating requirements, which will eliminate a few men on the production deck allowing more room for the horizontal bar rod busters to place and tie the bar.
Since the cure will start when the concrete is placed, the pressure on the slip form plates will reduce, allowing them to be moved down on the vertical yokes allowing a larger dimension between the horizontal bar and the work deck. This will allow the rod buster a larger space and time for rebar placing and tying.
The upper deck will have fewer concrete boom placement feeds, allowing better rebar and concrete management.
If the structure is designed with Basalt rebar, its lightweight and ease of handling could easily cut the rebar crew by a third, allowing for better rebar management and a faster slip.
MINIMUM MODIFICATION TO THE SLIP FORM FORMWORK
In general, the formwork will have to be modified to achieve the higher slipping rates. These few changes and adds are as follows:
- Teflon coating on all forming plates
- A single wire, low voltage plug-in, from the back through to the surface face so some but not all of the forming panels
- Placing insulation on the waling’s to ensure there is no incorrect voltage flow to the facing panels. There is a wide variety of ways to accomplish the voltage installation.
- The voltage input placement for a four-foot deep forming panel run is, a single wire adapter placed one-foot down every five feet along the top and one-foot up from the bottom, placed two and a half feet laterally starting from the inputs above.