Costrucability approaches and technology

1. CONSTRUCTABILITY APPROACHES
ANDTECHNOLOGIES IN BUILDINGS
PRESENTED BY
VIJAYVANNAN AP14004
THANIGAIVEL AP14011
VAIBHAV ARORA AP14013
PRITHIV NANDAN AP14027
DURAI SARAVANAN AP14037
NATIONAL INSTITUTEOFCONSTRUCTION MANAGEMENT &
RESEARCH, PUNE
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2. • Constructability is a project management technique to
review construction processes from start to finish during
the pre-construction phase.
• It is to identify the obstacles before a project is actually
built to reduce or prevent errors, delays and cost overruns.
• Technology is comprised of the products and processes
created by engineers to meet our needs and wants.
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3. Barriers in improving constructability
• Reluctance to invest additional money and effort in the early
stages of a project.
• Lack of construction experience in the design firm.
• Lack of mutual understanding between constructers and
designers.
• Site responsibilities are not clear and co-ordinated.
• Client differences are not resolved immediately.
• The construction schedule and budget are not tied to scope.
• The firms accepts the project with uncompensated risks.
• The construction budget and schedule is inflexible.
• There is a high volume of change orders.NATIONAL INSTITUTEOFCONSTRUCTION MANAGEMENT &
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4. • The client has a high public profile which generates public
attention, putting pressure on design decision-making
processes.
• Many constructability issues occur with design-bid-build
projects as a lack of communication between the project owner,
architect or designer and the construction company before
construction commences.
Solutions :
• Performing constructability reviews during the design process
phase.
• Another approach is to identify the likely tendering construction
companies and ask them to each provide an experienced
construction engineer or manager to form a team to help the
designers and develop a buildable solution from the outset.
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5. Technology impacts in buildings
• Use of technology in materials results in high productivity,
less harm to environment, cost and time saving.
• New advanced materials offer opportunities to change the
way in which we construct and retrofit buildings.
• They give added value in terms of increased performance
and functionality.
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6. Dry wall
• Drywall is a panel made of gypsum plaster pressed
between two sheets of paper.
• It is used to make interior walls.
• Drywall construction is now widely used as a speedier
alternative to traditional method.
• It reduces the weight of the building.
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7. Advantages of dry wall
• Transition from brick wall to drywall saves time.
• Normal brickwork requires 3 days whereas Drywall requires only half day of work.
• Drywall reduces the weight of the building.
• Different types of drywalls are there for different purposes.
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8. Types of dry wall
• Moisture resistant
• Foiled back
• Fire resistant
• Sound Proof
• Aqua Panel
• Cement board
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9. Procedure for erection of dry wall
• Demarcation line should be laid first using total station
and RL
• Bottom tracks are laid and fixed and the top track is then
fixed
• Vertical Studs are placed and fixed at the bottom and is
left unfixed at the top with a gap of 20mm
• Then the gypsum boards are fixed with the help of screws
and the primer is applied and then the wall is ready for
painting
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11. Aluminium formwork• Using this unique formwork, all walls, floor slabs, columns, beams, stairs,
balconies, together with door and window openings are cast in place in a
single site based operation.
• The resulting building structure is very strong, accurate in dimensions and
tolerances, with a high quality of finished concrete surface.
• It is fast, adaptable and very cost effective.
• It is a lightweight panel with an excellent stiffness to weight ratio, yielding
minimal deflections under concrete loading.
• It can be reused over 250 times.
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12. • REPETITIONS: A large number of repetitions (reuse) of
modular formwork is possible.
• MAKING INVOLVED AT SITE: Very less making at site,
only assembly of standard components require.
• COST: Cost of formwork being considerably on a lower
side.
• PLANNING REQUIREMENT: The standardization offers
ease in planning.
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13. • EXPERTISE REQUIRED AT SITE: The work can be accomplished even by
the less skilled worker.
• QUALITY OF CONCRETE SURFACE: The quality of concrete surface
obtained is extremely good.
• PRODUCTIVITY: Very high productivity.
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14. AUTOCLAVED AERATED CONCRETE
BLOCKS (AAC)
• AAC blocks is one of the most sustainable building materials today.
• The unique product flexibility and characteristics allow for high-speed
and energy efficient construction methods.
• BLOCK SIZE: 625x240x200 mm.
• DENSITY: 500 to 700kg/m3.
• COMPRESSIVE STRENGTH: 3 to 9 MPA.
• FIRE RESISTANCE: These blocks are 2 hrs. fire rated.
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15. • QUALITY: Uniform Quality due to mass production in the
factory.
• COMPRESSIVE STRENGTH: AAC block has 30-35 Kg/cm2
whereas Brickwork has 20-25 Kg/cm2.
• CONSTRUCTION TIME: Speedy construction due to its
big size.
• ENERGY SAVING: 30 % (approx.) i.e. Air-conditioning
Load both heating and cooling will come down.
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16. • CEMENT CONSUMPTION: Less consumption of Mortar
due to flat surfaces.
• Column & Beam size reduced and so less Concrete
Required.
• SIZES AVAILABLE: Available in sizes of 3", 4", 5", 6" 8",9“.
• CARPET AREA: More Carpet area is available in same
built-up area due to less widths of walling less.
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17. PU Sealants(Water Proofing)
• It is an elastomeric material that allows for 25% to 50%
movement.
• It can be easily painted over.
• It does not easily shrinks.
• It does not get easily damaged by abrasion, it means it
can be used for flooring.
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18. • Due to sway in high-rise building, we need a material
which can be elongated up to 550X whereas in
conventional we do not have this advantage.
• Hardness to sustain impact 75%.
• Tensile Strength more than 1Mpa whereas in conventional
system this advantage is not present.
• LowVOC (Volatile Organic Compound).
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19. Procedure followed are
• Surface cleaning
• Surface preparation - Grinding
• Crack Filling
• LMPU Sealant is filled on the edges 15mm x15mm
(Requirement: 21 mm hypotenuse).
• Application of primer
• Application of Silicor ®560 (2 layers)
• Rectification of Pin – Holes and Air Bubbles.
• Water Ponding
• Screeding.
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20. Belt wall
• Differential settlement of column
• With the use of belt walls, we can reduce the space for columns and gain
effective floors in the tower.
• In Oberoi Worli project they have been used in Floor 60 and Floor 33.
• To improve building overturning stiffness and strength by connecting the
buildings core or spine to distant column.
• To reduce the depth of foundation.
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23. Hard rock excavation
• In Pashmina Waterfront project, Bengaluru, the soil strata was
hard rock and so excavation using controlled blasting was
needed.
• But since it is a residential area blasting technique could not be
followed
• So a special expansive mortar chemical was used for excavation
• This non-explosive demolition agent is easy to use, cost effective
and a safer option for silently breaking up hard materials
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24. • It is basically a cracking agent which when mixed with
water, it expands.
• It controls noise pollution and reduces the labor and
equipment breakage risks and cost
• It helps in improving the site logistics and minimizes the
dust and toxic pollution in the site.
• It is a best alternative to explosive blasting, jack
hammering, concrete saws and stone cutters - particularly
on sites with noise restrictions, vibration issues, safety
risks, confined spaces
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25. • Excavation can be done for any definite depth. In blasting
technique the depth to which the rocks will crack cannot
be certain.
• Drilling is done according to the shape and pattern in
which the crack is anticipated.
• The cracking agent is mixed with water and poured into
the drill holes and left for 24 hours.
• The cracking agent uses pressure to overcome the tensile
strength of the rock.
• After that the rocks are broken and disposed.
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