Kia ora SITE SURVEY PREPARATION AND ANALYSIS
I have had a query on the Civil Works and the hand in is this coming Monday.
ie what on earth do we do?
My reply
The Woods Consultant drawings have the services.
And the Woods Consultancy have the Civil Work drawings
Civil works are horizontal and Structural Works are vertical roughly.
- What at the key services entering and leaving the site
- Where are the services routes of travel shown
- Which service trenches should you start first
- How deep do the service trenches need to be
We need to under 1. find power in a 3 phase 25 mm thick cable, water in a 50 mm diameter pipe, drainage in anything from 100 to 250 mm diameter pipes, and conduits (sleeved pipes) carrying 3-10 5 mm electrified or fibre communications ie phone copper or fibre optic cabling.
In 2. then we need to identify those services which come from up the street, down the driveway and across to the parking area and to the proposed building. Are there any that are leaving to go out of the site. Yes, drainage. Alright, where does this go? What is the most important service? They all are but each has different construction ie power has to come from a new transformer in Fairdene. Some have to cross the Fairdene road Some are the same side of the road so must travel down the footpath. Fairdene's services must all arrive down the driveway. How do they all get together in the drive?
In 3. if you need power quickly to the site, and you do to run your construction plant and equipment, then you need to have that trench for power. You will need water. So a water pipe will be that driveway trench. What about other services which are not ready to come down the driveway but are needed in the trench? We put in PVC conduits with internal sets of wires so we can both cover the trenches because we have heavy excavators and trucks building the carpark first for truck deliveries delivering the first of the building materials shortly, but we can pull those latter services through using the pull through wires at drawpits at each end.
In 4. you can now cherry pick this information because you now know what is about the happen. So find all the proposed levels on the civil drawings including cross sections of kerbing, manholes, carpark surfaces etc and work from those final levels back under ground to see how much we need to excavate. If we undercut then we will not be carrying double axel truck loads by applying the correct bearing layers. If we overcut, we then have to make that up on good quality metal which can be just as expensive as concrete.
How do we show all this now?
We make a programme. We make an excel sheet of things to do but we can write more on the excel. We can make lists in word of the notes that we need to be aware of having looked at 1, 2 and 3 and 4. (and please note down the drawing your sub note apply to otherwise others coming after you have to read what you have written and then build from it), so you have to still be ready for anything the school may need as well ie children and parents coming up and down the drive too. How will we manage them. Any ideas?
Nga Mihi
Rodney Harvey
Lecture