Construction Technology and Environmental Services Flashcards
(32 cards)
What are some common foundation types?
- Pad
- Strip
- Piled
- Raft
What are some types of external wall?
- Curtain Walling
- Traditional Masonry
- Cladding system
When would you use piled foundations? What if there was need for waterproofing?
- When subsoils have lower ground bearing capacities
- High rise builders
(waterproof concrete or secant piles etc)
What did you learn in your methods of construction CPD?
- Traditional construction methods
- Modern Methods of Construction (7 different types)
What is the RIBA plan of work? What does it do?
- RIBA Plan of works is published by the Royal Institute of British Architects
- It provides a guideline for architects, contractors and project managers to help structure the process of project from inception to completion.
What is BREEAM?
- BREEAM is a sustainability accreditation body
- It stands for Building Research Establishment Environmental Assessment Method
- It assesses the sustainability and environmental performance of buildings throughout their lifecycle
What is a CFA pile? What is the difference between a bored pile and a displacement pile? When would you use both?
- CFA stands for Continuous Flight Auger
- It excavates and fills the excavated area with concrete which will form the pile
- A bored pile will replace the excavated material with concrete simultaneously, a displacement instead forces itself into the ground and displaces the earth below it to create the room.
- A displacement pile could only be used if the site and surrounding areas are not densely populated.
What are some key differences between a steel frame and a concrete frame?
- Steel frames are faster to install
- They are also more sustainable as they are recyclable
- Concrete frames however perform better with acoustics, thermals and fire resistance
- Steel is also more volatile in terms of price than concrete
What are some types of curtain walling? What is the most common type used on office type schemes?
- Stick-built
- Unitised
- Stick-built is more common if the qty is lower, unitised is more common where the area is larger – its more expensive so requires large quantities for economies of scale to be achieved.
What is the difference between CAT-A and CAT-B?
- CAT-A refers to an office that will have a basic finish, M&E services, raised access floors – not to a tenant specific fit-out
- CAT-B refers to a fully furnished and finished space for a tenant to move into
What are the main issues faced when working with re-cycled steel?
- More expensive
- Typically, hard to source and will have longer lead in periods than normal steel
How was the embodied carbon of each frame option calculated?
- This included the generic items of comparison for each option (thermal performance, cost, programme and fire resistance and kgCo2e for each
What was the embodied carbon (kgCo2e) for the frame on Quad Three?
130 kgCO2
What project and site particulars did you present on that effected the choice of frame?
- Dealing with vibrations (important for the project as the potential tenants could include those completing lab experiments)
- Fire – proximity to other buildings
- Acoustics – would need to be highly efficient in dealing with acoustics due to the potential tenants (professional office environment)
- On Gascoigne East 3b, why were CFA piled foundations chosen
- CFA piles were used on GE3b as the ground conditions were poor, meaning load bearing capacity was also lower.
- Additionally, CFA (replacement pile) was used due to the populated area of the site, so as to not disrupt other buildings and foundations.
Can you tell me the build up to a pad foundation?
- Setting out
- Excavation
- Temporary Strutting / Protection
- Hardcore / Sand
- Compact and Level
- Formwork
- Rebar
- Pour concrete
On Quad Three, you mention the client was keen to target the frame to reduce embodied carbon. Can you tell me some of the advantages and disadvantages of using GGBS?
Advantages
* More sustainable
* Increased workability of concrete
Disadvantages
* Longer curing times
* More expensive
Can you tell me the main different frame types you are aware of?
- Steel and concrete, in my experience
Can you talk me through the heating strategy on one of your projects
- GE3b – District Heating Network
- This essentially gains a supply of water from a Central Point that supplies a number of different areas
- The supply is taken to the substation for the building in question
- Here it will enter the substation and encounter a heat plate exchanger.
- This heat plate exchanger creates the heated water that is then distributed to the Heat Interchange Units (for each apartment). This provides the tenants with a localised control of the temperature of water and heating.
What foundation strategy would you assume when producing an early cost estimate for a Highrise office in London?
- Replacement Pile – such as a CFA pile
What the difference between stick and unitised curtain walling system
- Stick-built – Manufactured and fitted piece by piece on-site to frame.
- Unitised system – These are manufactured off-site and delivered to site as a complete panel. These are then fixed back to the frame.
What types of piled foundation are you aware of?
- 2 key types, replacement and displacement
- CFA, Bored, Pre-cast, Sheet piles, secant, contiguous piling
What types of external wall cladding have you come across?
- Rainscreen Cladding
- Composite panel cladding
- Timber cladding
What are the typical components of a traditional masonry external wall?
- Facing brickwork
- Cavity
- Insulation
- Internal Blockwork
- Brick Ties
- Cavity Trays
