NEW MATERIALS AND TECHNOLOGIES in CBI AND SOME OTHER BUILDINGS of MUMBAI

Dr K M Soni, Chief Engineer, CPWD, Mumbai

Usha Batra, ADG (Arch), CPWD, N. Delhi

Projects

• Central Bureau of Investigation, Mumbai

• Pre fab building for films division (NBCC), Mumbai

CBI Project Mumbai

DESIGNER’S VIEW OF CBI office MUMBAI

Project Brief

• Location: C-35 A, G Block, BKC, Mumbai

• Architect: Enarch Consultant (Pvt) Ltd.

• Plot Area: 1500 sqm

• Floors: 2 Basements+Ground+13 storeys

• Cost: 103 Crore including @ 20 crores paid to local body, 4.8 Crore paid for networking and complete furnishing/furniture

Salient Features of the Proposal

• Civil RCC Framed Structure (G+13)

• Central air-conditioning

• 2 Basements with diaphragm walls having anchored system with exhaust

• Basement double stack car parking (52 vehicles)

• Four – 13 Passengers and one goods lifts

• Fire alarm system

• Fire fighting system

Contd.

• Electric sub station

• DG Set (750 KVA)

• Pump sets

• STP

• External Development

• HT service connection

• Energy efficient electrical fans/fittings

Contd.

• Gas based fire fighting system for computer room and rare document section

• UPS system

• EPBAX

• Integrated conferencing system

• Signage

• Motorised gate with sensor

Contd.

• Integrated Building Automation System

• CCTV and access control system

• Rain water harvesting

• Solar PV generation

• Interiors, furnishing and furniture

• Office automation by NIC

• GRIHA Ratings for green building (4 star proposed)

STP

Post Tensioned Slabs

PT slab from NISM

Steps in construction • Design

– The existing design has been based on Presscrete Post-Tensioning System (PPS). Concrete in one member panel shall be placed in one operation continuously without interruption.

• Concreting– Care is taken that the pre-stressing tendons do not get

displaced or damaged prior to casting and during casting. It is ensured that discharge of concrete is not directed onto the pre-stressing tendons. Vibrating is avoided from coming into contact with the pre-stressing tendons whenever possible. Proper compaction of the concrete in anchorage areas is ensured due to high local stresses in these areas and care taken that all the grout hoses remain exposed and protruding from the concrete surface.

Steps in construction

• Stressing– After concreting, the carpenter removes the vertical sides end form

work. All the stressing recesses are cleared and pre-stressing barrels and wedges fixed to all pre-stressing castings. When concrete has reached the transfer strength as per the shop drawings (from the results of cube tests), stressing of cables is carried out. All cables are tensioned to the required jacking force and monitored through the pressure gauges.

• Grouting– Excess cable length is cut after the stressing. All pre-stressing

tendons are ensured to be flushed with clean water. Grout is mixed according to the design mix for at least two minutes until a colloidal consistency is produced. The water is put into the container first and the cement is then slowly added. When the cement and water are thoroughly mixed, the non-shrink additive added to the mix. The grout then is injected into the pre-stressing tendons. Grouting is carried out by injection at one end of the duct until clear grout flows out from the other end. The grout hose at the both end is then sealed. Grouting works commence when all scaffolds at a particular storey where grouting works are to be carried out, are removed.

Limitations

• Since the cables or tendons in the slab have been stretched to high tensile strengths, it is extremely important that the slab is not drilled, cut, chiselled or disturb in a way so as to expose the tendons

DRY STONE CLADDING

AAC Blocks

Double Stack Car Parking

COREAN MATERIAL IN CPWD OFFICES

• Corian is the brand name for a solid surface material created byDuPont. Its primary use is as a countertop/benchtop surface,though it has many other applications. It is composed of acrylicpolymer and alumina trihydrate (ATH).

• Available in three thicknesses: 6 mm, 12 mm and 19 mm. Non-porous

• Stain resistant• Seamless appearance:• Various colours• Repairable and renewable:• Thermoformable• Heat resistance: the material is heat resistant up to 100 °C (212

°F), but can be damaged by excess heat.• Scratches: The material can be scratched, with scratches

particularly noticeable on darker colours.

Glass

• Structural Glazing

• Partitions

• Fire resistant Lobbies

• Doors

• Murals

• Solar PV Panels

SOLAR ROOF TOP PANELS

AHU ON TOILET SLAB

SYNTHETIC GRASS

FOLDABLE PARTITION

Energy efficiency

• In new buildings only LED fitting or energy efficient T5 fittings are provided.

• Energy efficient Chillers are provided

• Solar roof top PV Panels

• Recycling waste water

• Rain water harvesting

Pumping system

• CPWD has adopted hydro-pneumatic pumping system for water supply in most of large projects.

PRE-FAB BUILDING FORFILMS DIVISION, Constructed by NBCC AT

MUMBAI