The task involves upgrading and refurbishment of all public toilets in the building. The conditions for the refurbishment works include carrying out a complete strip down of the existing fixtures and fitting, installing new sanitary ware, cubicles, tiling, flooring, plumbing, lighting, hand dryers, extraction equipment and decorations. A requirement is that at all times, at least one male or female toilet must be operational on each floor and at least one executive toilet. The refurbishment work is set to begin no sooner than 2nd July 2018 and completion date not later than 30 September 2018.
The materials selected are determined by factors such as budget, washroom environment and use, aesthetics and the period when the toilets are to be taken out of action.
Movement of Materials
The materials will be moved using two cargo lifts. Incoming materials will use the Eastern cargo lift while outgoing materials will use the Northern cargo lifts. All material will be loaded to a trolley cart to ensure that fragile material does not break due to slipping.
The floors will have non-slip, vinyl and non-slip floor tiles. There will also be non-slip finish to avoid the possibility of accidents. The flooring area will be prepared using self-leveling screed. This will be followed by laying of Polysafe nonslip vinyl flooring on the rooms and lobby through an application of adhesives and cove forms on the edges.
This will have suspended ceiling with a plasterboard with a paint and decorated finish. The ceiling will have the capability of coping with higher humidity levels. The ceiling will be installed with ceiling tiles, 600mm by 600mm Danotile white ceiling tiles.
The walls will be comprised of wall tiles, wall cladding, and wall paneling systems. The general rule for the wall is that harder wearing wall finishes comes with an increased overall cost but with ease maintenance and longer life. The tiles to be installed will be white gloss wall tiles of 400X250mm.
Toilet Cubicles and Paneling
The premier range of the materials to be used will be Solid Grade Laminate (SGL). The lavatories will have standards height WC cubicles with duct panel sets. There will be installed modesty screens and coat hook rail. There will be urinal duct panel sets
There will be installed concealed cisterns and automatic toilet sensor flush kits, urinal bowls, urinal sensor flush control kit, and powered sensor taps.
There will be LED Downlights for use with some being used for emergencies with a battery for backup. These will be switched using PIR sensor. Their toilets will also have biorier executive hand dryers.
These include mirrors, mounted soap dispensers, brushed jumbo toilet roll holder and a site for unwanted materials, cleans rooms and wipe down surfaces. Removal of resultant waste after stripping down the old toilets
The waste generated after stripping down the existing structure will be removed using the trolley carts and the lifts. It will be filled in heavy duty trolley carts which will be carted away using the cargo lifts to the ground floor and out of the building to a designated dumping site awaiting clearance by a dump truck.
|Strip down-existing structure and removal of resulting waste from the building.||1 day||–|
|Structure the cubicles and panels||2 days||a.|
|Work on the Walls||1 day||b.|
|Install plumbing||1 day||c.|
|Install sanitary ware||1||d.|
|Fitting the ceiling||2||c.|
|Installation of electrical fittings and gadgets||1||g.f|
|Duration||Precedent||Earliest Start time||Latest finish Time||Slack Time|
|Strip down-existing structure and remove resultant waste||1 day||–||0||0||0|
|Structure the cubicles and panels||2 days||a.||1||1||0|
|Work on the Walls||1 day||b.||3||3||0|
|Install plumbing||1 day||c.||4||6||2|
|Install sanitary ware||1||d.||5||7||3|
|Fitting the ceiling||2||c.||4||5||1|
|Installation of electrical fittings and gadgets||1||g.f||7||7||0|
Critical Path Analysis
The critical path analysis seeks to determine the longest path of planned activities to the end of the project. To calculate this, it is important to have a list of all activities that are required to complete the project, the duration required to complete each task, and the dependencies that exist between the articles. With this, it is possible to calculate the earliest and latest time that each activity can start and finish without affecting the set project duration.
The critical path is the longest path which cannot be delayed without affecting the project duration. It also determines the activities that have a float and can this be delayed without affecting projecting duration. As indicated on the table above, the critical path for the refurbishment of the toilets of the commercial buildings.
Critical Path= a-b-c-f-h-i-j
Activities with float= d, e & g
The following activities in the project should be focused on to ensure that the project is completed within the stipulated period.
a. Strip down-existing structure
b. Structure the cubicles and panels
c. Work on the Walls
h. Installation of electrical fittings and gadgets
The critical path for the project is nine days. This is the least amount of days that each the refurbishment works will take on every floor. The time allocated for the refurbishment work is four months from June to September. To accomplish this task within the stipulated time, works should be concurrently carried out in at least three floors. During the period of doing the construction, at least one male or female toilet must be operational on each floor and at least one executive toilet.
Work Breakdown Structure
These are the tangibles in the toilet that a user sees. They make up the interior of the toilet and they include; walls, ceilings, floor, doors and mirrors.
Cistern and W/C Pans
Sanitary Bins & Waste Bins
Toilet Roll Holders
Small Power Equipment
There will be proper documentation of the works done and the equipment fitted in the toilets; this is meant to provide a comparative tool to ensure that the project meets the stipulated specification and for easy identification of errors of omission.
The operatives engaged to carry out the project will have appropriate skills and experience in handling toilet refurbishments. A file with their evidence of the qualifications will be maintained. The quality of all equipment to be fitted is paramount. All equipment used will be new and sourced through the set procurement standards. This will seek to ensure that products are consistent in size, kind, quality and general appearance.
The execution of the project needs to ensure that all equipment is fixed applied and installed securely, neatly and well aligned. The dimensions are to be adhered to. It will be critical ensure that finished works are no defects. The joints will need to be made even and regular.
Compliance is a crucial quality control requirement that will be addressed. Evidence of compliance will be provided that will detail the properties tested, pass/fail mechanism, test procedures, results of the tests, date and time of the test and analysis of the results.
The drainage system will have single stack system where will have to offer quick, quiet and complete, self-cleansing in normal use. The drainage should be without blockage, crossflow, and reduce the risk to health. The system should be capable of handling pressure fluctuations at about 38 mm water gauge. The water seals will be 25mm.
The components of the drainage system will be from the same manufacturer to ensure consistency. The electrolytic corrosion will need to avoid contact with metal where thereby avoiding corrosion. Plastics and galvanized steel pipes will be fixed in a manner that it will not bend. The pipework installed in the system should have an allowance for thermal and building movement. To offer protection of the system, there will be fitting of temporary caps that will prevent ingress of debris. The access covers and blanking plates will be fitted as the work proceeds.
The pipe routes will use the already laid systems which have limited beds. The routes for the pipes will need to follow the routes marked in the drawings. The fixing of the piping will need to be securely fixed. The discharge stack pipes will be connected below the socket collar or coupling. Any branching and low gradient parts will be to be fixed uniformly to ensure efficient drainage. Additional support will be provided where deemed necessary to offer support to the junctions and a shift in the direction. For the vertical pipes, support will be added to every floor. The fixings will also be progressively tightened to ensure that on every floor, the fixings as self-supporting. Any joint will need to be made using the appropriate materials that are intended for the purpose and to ensure that they offer durable connection.
The major cost centers for this project include
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