Monday, May 21, 2007

Glen Waverley Medical Consulting Suite

The Glen Waverley Medical Consulting Suite is still under construction. It has two levels. The ground level is made from pre-cast concrete panels while the top story is constructed mostly from steel structral memebers.

The roofs structural members are fixed to the concrete panels using chemset bolts. All bolt/fixing locations have been co-ordinated off site. Shop drawings have been created by the fabricator which have been reviewed by the engineer and architect. Once amendments have been made (if necessary) the fabricator begins the fabrication process.

The feet of the brace are held into position with bolts. When it time to remove the bracing (when the concrete panel is stabilised by other memerbs around it), the bolt will be removed and the hole can be filled with cement.

Bracing is used to support the column until other structural members around it have been installed and the panel is stable.
Cast in the concrete is an eye-bolt which is used as a point for the crane to lift the concrete panel. There will be at least two eye-bolts so that the concrete panel is stable during the lifting process.
The bolt projecting from the wall is used as a fixing point for the brace which is used to hold the panel in position during construction.
Purlins are braced at right angels keeping them from over turning and to reduce the effects of lateral forces. Rods of 20mm diameter are also use to reduce the effect of these forces and carry loads to the load bearing members. Again for safety purposes, mesh is installed above the purlins which stops workers from falling through the roof members onto the ground/floor below.

Pre-cast concrete panels are used on the ground floor. The panels are constructed off site and delivered to site on a truck. Panels are manufactured by laying reinformcement in a mould followed by the concrete (concrete MPa will depend on function).
Panels are lifted off the truck with the use of a crane/mobile crane.
When designed the size and location of mullions, panel legs and spandrels need to be considered both for structural purposes and transportation and lifting stresses.

An opening still remains between the two large concrete panels which start at ground level and finish at roof height. These panels are still fixed using braces as they are not fixed in position by surrounding members.

No comments: