PROJECT DESCRIPTION SYNERGY CONTRACTING (ZAMBIA) LTD ARCHITECTURAL DESIGN OVERVIEW Garden City will be Zambia’s first office park. The office park will be comprised of blocks of office units, totaling approximately 9,200m2 of office space available for purchase in the first phase of development; this number will rise to 15,000m2 in the second phase. The first phase consists of blocks of 1,200m2, 1,000m2, and 800m2 respectively. Each block is divided into individual units, with available unit sizes ranging from 200m2 to 600m2. All blocks will be double storey with the smallest units having a footprint of 100m2. There will be a total of 368 parking bays serving the 9,200m2 of office space in the first phase, that is, each 200m2 of office space will be allocated a minimum of 8 parking bays measuring a spacious 2.5mx5m. Parking lots will have parallel bays with a wide 7m access road in between allowing for 3.5m lanes in either direction facilitating movement of traffic and ease of entry and exit from parking bays. The office buildings comprise of two floors with a floor-to-ceiling depth of 4m on each floor, allowing ample light penetration into the deeper office space and facilitate better ventilation. EXTERIOR The design allows for a low maintenance façade consisting of curtain wall, coloured paint and clear glass sections in a distinctive pattern which provides the design with a unique and relevant identity in the master plan. The ground levels are extensively glazed to allow for connectivity between outside and inside and to facilitate views through the building into the open spaces and parking areas. Both the front and rear of each office unit will have large windows at regular intervals to allow for light to penetrate the building. The site will be heavily landscaped with indigenous trees and lawn areas to provide a natural and earthy setting for the buildings. Indigenous trees will be preserved in the parking lots, as well as the open spaces to give the office park its unique ‘garden-like’ characteristic. COMMON AREAS The common areas will include the shared parking lots and the open/green spaces. As a part of the estate management, a monthly fee will be charged to all individual owners for services such as grounds maintenance/landscaping, water and sewage, security, road and drainage upkeep. Owners will have peace of mind knowing that they are not personally responsible for servicing and repairing common areas. 2|Page SYNERGY CONTRACTING (ZAMBIA) LTD INTERIOR LAYOUT AND PLANS The office component is an expansive, open plan arrangement, which overlooks the open spaces, trees, parking lots, and other office buildings. The glazing is from floor to ceiling in a density pattern that allows for the maximum amount of light per façade relative to the potential heat gain and direct sun penetration. The pattern of glazing allows for cellular or open plan offices relative to the grid. All spaces are lit, ventilated and air conditioned by economic and controllable systems to the latest available standards. Floors plans have been developed to allow clients to choose from either open plan or cellular arrangements. Architectural designs have been developed for a range of potential clients, including hair salons, restaurants, coffee shops, and gymnasiums. Each standard 200m2 office is equipped 2 male and 2 female toilets, a kitchenette, and ample storage space. Equivalently, the 400m2 units will be equipped with 4 male and 4 female toilets, and finally 600m2 units will be equipped with 6 male and 6 female toilets, ensuring adherence to international sanitary standards. Each floor will be designed to have independent internal access. A client may wish to occupy one floor and rent the other floor as a return on investment. The architectural designs of all units allow for this. INTERIOR FINISHES Each unit will be finished with impervious porcelain floor tiles and vinyl clad fissured fiberdek ceiling tiles. The stair treads will be hardwood, and the staircase handrails and balustrades will be a high quality combination of aluminum and glass. CIVIL ENGINEERING The following provides the general site conditions and describes the design philosophy and approach for the civil engineering aspects of the project. All design work will comply with the applicable local authority and national Zambian building regulations and will in general be based on British standards used in civil engineering design. Where applicable and practical all designs will be done according to best practice for environmental sustainability and minimum maintenance requirements. SITE CONDITIONS The site situated on Great East Road at the Airport Roundabout with its northern boundary along the main road. The site is approximately 10acres and slopes from the north western corner towards the south eastern corner along Great East Road. The total fall across the site is estimated to be approximately 4 to 5m from topographical survey. The geotechnical report 3|Page SYNERGY CONTRACTING (ZAMBIA) LTD indicate as the soil type as fine grained soils (silts and clays), both organic and inorganic with a medium plasticity. The type of soil was considered in the structural design of the buildings. DESIGN APPROACH & PHILOSOPHY ROADS AND PARKING AREAS The roads and parking areas will be constructed with asphalt surfacing. The subbase of the road will be composed of natural gravel and a depth of 150mm, layered with a 3% cement stabilized base of depth 150mm, and finally sealed with an asphalt surface of 30mm. All lane widths will be standardized at 3.5m, with the main boulevard having a 3m landscaped central reserve. Concrete kerbs would be provided along the roads and on the parking boundaries to ensure that traffic will travel and park along the intended routes. Parking bays will be demarcated with road paint and all required statutory road signage will be provided according to the local authority regulations. The access road into the site will be asphalt surfaced from Great East Road just after the Airport Roundabout at the north eastern edge of the property. Parking spaces measure 2.5m x 5m, as recommended by National Parking Association’s Guidelines for Parking Geometrics, Washington D.C. and confirmed by SABS (Southern African Bureau of Standards). The recommended parking ratios for general business offices are 3.67/100 square meters of gross floor area, as per standard set out by the Institute of Transportation Engineers, Washington D.C. This converts to a ratio of approximately 7 parking spaces per 200m2 of gross floor area. The office park has been conservatively designed to have an improved ratio of 8 spaces to every 200m2 unit. WATER SUPPLY The office park has one borehole on site, yielding a flow of approximately 2ltrs per second, to supplement supply from Lusaka Water and Sewerage Company. The borehole has been drilled at the south western edge of the property and will supply the site with water. There is an existing domestic water connection at the north western boundary of the site, supplied by Lusaka Water and Sewerage Company from a large rising main, located along the western boundary of the property, which supplies the area with water from a number of boreholes in Avondale. A connection with a water meter exists at this position, and will supplement the boreholes supply of water. 4|Page SYNERGY CONTRACTING (ZAMBIA) LTD STORM WATER DRAINAGE Storm water will in general be accommodated on surface of the parking lots to avoid culvert pipe systems. A number of kerb and grid inlets will be installed in the parking areas along the proposed building positions to drain storm water from these locations towards catch pits along the main boulevard which will then feed the main open channel drainage along Great East Road through storm water pipes installed along the main boulevard of the office park. Similarly, water from the eastern portion of the site will be fed into an open drainage channel along the south eastern side boundary of the site which will have its outlet towards an access road along the eastern property line. SEWERAGE Sewage will be collected from individual units directed towards manholes located in the service ducts of the buildings. Manholes with heavy duty covers will be provided at each connection point and at a maximum distance of 30m apart. Sewage will be directed toward the sewage treatment plant located at the southern edge of the property. Treated grey water will be pumped from the treatment plant to irrigate all green areas on site. STRUCTURAL ENGINEERING The following provides the general site conditions and describes the design philosophy and approach for the civil engineering aspects of the project. All design work will comply with the applicable local authority and national Zambian building regulations and will in general be based on British Standards (BS 6399, BS 8110:1985, BS 5950:2000) used in structural engineering design where applicable and practical designs will be done according to best practice for environmental sustainability and minimum maintenance requirements. DESIGN LOAD All design loads are to be in accordance with British Standard Code of Practice BS 6399. The basic wind pressure has been assumed at 40m/s, the imposed load on the ground and first floors is 3.5kN/m2 as per office design standards. The maximum foundation pressure is 75kN/m2. DESIGN STRESSES All reinforced concrete design and construction will be in accordance with BS 8110:1985. The concrete crushing strength will be 30 N/mm2. Unit stresses in design are as follows; direct 5|Page SYNERGY CONTRACTING (ZAMBIA) LTD compression 7.6N/mm2, compression due to bending 10N/mm2, shear 1N/mm2, bond 1.5N/mm2, tension 230N/mm2, tension in helical reinforcement in columns 230N/mm2, tension in shear reinforcement 230N/mm2, compression in column bars 175N/mm2. The yield strength of the steel is 460N/mm2. All structural steelwork design and construction is in accordance with BS 5950: 2000. DESIGN APPROACH & PHILOSOPHY The building will be designed as a conventional steel structure, with a 150mm reinforced concrete slab for each floor supported by universal beams. The steel framed building will be infilled with block panels and windows/facades along the outer perimeter. The building will be built on concrete footings for the columns, and strip footings for the block walls and facades. The mono-pitch roof will be supported by steel trusses spaced at 2.5m and the steel structure will be braced in both directions. A number of expansion joints will be provided in the buildings at expansion joints. ELECTRICAL SPECIFICATIONS BULK ELECTRICAL CONNECTIONS The main bulk electrical connection will come from an existing 11kv electrical cable that is installed along the border of the premises. The project will be built in two phases, both phase one and phase two will require a connected load of 880kW and a maximum demand of 700kW allowing for diversity. Each phase of development will have its own mini substation to supply power. Each 200m2 office unit will have a three phase 380V prepaid meter installed by ZESCO for regulation of supply to the premises. BACKUP POWER Emergency power will be from diesel generator sets. There will be one generator set per mini substation; each generator will be able to handle the full load of the mini substation. INTERNAL LIGHTING Each office will be provided with recessed functional recessed luminaire for 4' TL'D, 4X18W Fluorescent lamps housed in white sheet steel having improved efficiency mirror optic of standard quality aluminum with parabolic side reflectors and parabolic lamelle, or similar. 6|Page SYNERGY CONTRACTING (ZAMBIA) LTD EXTERNAL LIGHTING External lighting will be functional and possibly used for security purposes. The front boundary as well as the parking area will be fitted with street lighting. POWER CONNECTIONS Open plan offices will have power outlets wired to consolidated outlets in the ceiling void, and along the UPVC power skirting trucking along interior walls. The tenant shall be responsible for the wiring to individual work stations, which can typically be accomplished by the use of power poles. Socket outlets will be installed along the interior walls. ELECTRONIC SPECIFICATIONS Each unit will be equipped with UPVC 3 compartment power skirting trucking to allow for clean separation of LAN, Telephone and power cables. LOCAL AREA NETWORK (LAN) Wire ways and data outlet points will be provided inside the ceiling voids at consolidated outlets. The client’s contractor will be responsible for all wiring and installations of the LAN. Cabling for telecoms purposes can typically be reticulated from the ceiling void down to the work stations by the use of power poles. TELEPHONE Wire ways will be provided inside the ceiling voids at consolidated outlets. The client’s contractor will be responsible for all wiring and installations for telecommunication purposes. Cabling for telecoms can typically be reticulated from the ceiling void down to the workstations by the use of power poles. AIR CONDITIONING AND VENTILATION DESIGN CONDITIONS The proposed system design will be based on the following design conditions in Lusaka. Summer outside design conditions: Winter outside design conditions: Altitude: 7|Page 33’C dry bulb/24’C wet bulb 10’C 1289m SYNERGY CONTRACTING (ZAMBIA) LTD Lighting and equipment loads: 30W/m2 People densities: Offices: Offices: 1 person/10m2 38NC DESCRIPTION OF PROPOSED SYSTEM - The offices will be air conditioned by ceiling mounted air-conditioning units, 24000Btu/hour or similar. Condensing units will generally be located on the roof. Toilets will be mechanically extracted into service ducts ventilated through the roof. Each bathroom will have automatic hand driers. WET SERVICES CODE CONFORMANCE The proposed Engineering Services to be provided shall be designed in accordance with the relevant applicable codes, design standards, regulations and statutory requirements and in particular the following: - Plumbing Engineering Services Design Guide- British Institute of Plumbing - Local Authorities statutory regulations and requirements. - Local authorities codes and by - laws - Bs 6700 – Design, installation, testing and maintenance of services supplying water for domestic use within buildings and their cartilages – specification. - BS EN 12056 – part 1 to 5- gravity drainage systems inside buildings. 8|Page SYNERGY CONTRACTING (ZAMBIA) LTD GREEN INITIATIVES AND SUSTAINABILITY The design of Garden City Office Park will be governed by Environmentally Sustainable Design (ESD) principles. Wastewater will be directed from all office units to a wastewater treatment plant on site capable of handling 50,000litres per day. Grey water from the treatment plant will be recycled into the system to irrigate all landscaped areas. The 10acre site boasts over 150 trees, many of which are indigenous. A number of eucalyptus trees are found on site, reaching heights of over 20m. These trees have been preserved and worked into the design of the open/green spaces and parking areas; a key principle in the design of the master plan. The office park will utilize solar energy whenever possible. Office units requiring hot water will be supplied with a solar water heater as an alternative to the conventional electric geysers. The solar water heaters to be supplied are manufactured by Solahart in Australia, and have been extensively used in the Southern African region in the last 20 years. High illumination solar LED lights will be used for external street lighting. 9|Page
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