Con Tech

Question 1

Name a sustainable method on your project

Answer 1

The use of EPIV valves for the fan Coil units, more energy efficient by avoiding over pumping

Question 2

Types of external wall

Answer 2

Stone facade
Curtain walling
Brick slips
Brick work

Question 3

how is the stair constructed

Answer 3

the slab is cut top down- crash matts on floor below.
reviewed with structural engineer to seeif back propping was necessary
then the stair is constructed bottom up
hoarding is put up around where the slab cut is - 60min fire rated due to smoke extract on plant roof not being cut until L8 works

Question 4

using recycled steel beam on L6 cut out

Answer 4

• Careful/ controlled demolition of slab above beams, to retain shear studs and avoid damaging the beam flanges
• Beams temporarily supported to allow for unbolting, current contractor proposals would be to hang from level 08 beams, or MEWPs would be considered at level 06 to move beams into new position.
• Larger area of slab would be broken out to allow for metal deck to be place and new concrete slab to be poured – this would allow for the composite action be achieved between the beam and concrete, which is critical to control deflection over a long span.

Question 5

recycled beam on L6 benefits

Answer 5

• Significant carbon saving, as no need to re-produce sections (particularly fabricated sections, which are more carbon intensive), and reduction in materials delivered to site.
• Offers benefits to the buildability, as bringing new long-span steel elements to site will be challenging – the original beams were craned in, which is no longer feasible in the current building. New elements would need to be cut into sections small enough to fit into the goods lift, and reformed with splice connections along the length of the beam.
• Although increasing the scope of slab demolition, this could offer a significant saving overall in terms of cost, programme and carbon.

Question 6

recycled beam on L6 negatives

Answer 6

• The beams will be cut shorter than the current span, as the connections will need to be removed. This creates complexity in the new connections to be formed once the beams are in their new position.
• Beams could be damaged during demolition.
• The original beams were pre-cambered, which won’t be possible in the proposed condition with beam re-use – may be subject to higher deflections, which needs to be factored into the design.
• The tonnage of these beams is significant, which will prove challenging when trying to remove and reinstall in a new location.

Question 7

how do you test concrete

Answer 7

cube test, take samples at 7/14 & 21 days then its crushed, to see how it crushes shows the strength

Question 8

BREEAM Levels

Answer 8

outstanding 85% +
excellent 70-85%
very good 55-70%
good 45-55%
pass 30-45%
unclassified below 30%

Question 9

BREEAM assessment categories

Answer 9

management
water
energy
transport
health & wellbeing
resources
resilience
land use & ecology
pollution
materials
waste
innovation

Question 10

BREEAM Standards

Answer 10

new construction
refurbishments & fit out
in use
in community

Question 11

building safety act

Answer 11

post grenfell tragedy
dame judith hackitts report- building a safe future
new duty holders
principal designer
high risk buildings- 2+ residential units, 7+ storeys or 18m or taller

Question 12

types of concrete

Answer 12

pre cast
in situ