J.09_Swimming_Pool_Specifications.pdf
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- Solicitation number
- 72067419R00024
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This document provides specifications for constructing gunite swimming pools and details requirements for reinforcing, gunite application, curing, tiling, paving, electrical work, pumps, piping, finishes, and handover procedures.
The related federal contract opportunity solicitation is for the demolition of two USAID-owned residences and construction of two new USAID-owned residences in Gaborone, Botswana. The solicitation has been amended to respond to questions submitted by the deadline and revise the solicitation and attachments accordingly. The work requires adherence to gunite pool construction specifications including reinforcing with steel fabric and bars, applying gunite in layers to the required thickness, curing the pool shell for five days, installing mosaic tile at the water line, compacting and paving the surrounds, fitting electrical and timing switches per local regulations, and installing pumps and piping according to manufacturer instructions. The final interior finish for marble plaster must be applied with an even thickness of at least 6mm using an approved mix. Offerors must follow the demolition and new construction requirements for the two residences in Botswana and respond to the amended solicitation issued by the US Agency for International Development South Africa.
J.09 Swimming Pool Specifications
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REINFORCING FOR GUNITE POOLS - MINIMUM REINFORCING
1. A single layer of reference 156 or 200 high tensile steel fabric.
2. An additional layer of steel fabric referred to in para 1 for cove which must overlap 1 metre both sides.
3. 4 x Y10 high tensile bars in ring beam spaced 100 mm and to be continuous or 2 x Y10 bars with double reinforcing or steel fabric.
GUNITING
1. The standard mix shall comprise 1 part of Portland cement and 4 parts of course, sharp, well graded river sand. The aggregate shall be clean and free from organic impurities; the maximum size of particles not to exceed 10 mm.
2. Gauge boxes may be used when mixing on site or alternatively ready mixed with a guarantee by the supplier of 4 : 1 mix, or
3. 2 Pockets of Portland cement to 5 level concrete wheelbarrows of gunite sand – aggregate 7 mm.
4. Average thickness of gunite to be 100 mm.
5. The gunite shall be applied at a pressure of not less than 3 bars and the distance of the nozzle from the gunite surface shall be between 900 m and 1200 mm to ensure sufficient compaction of the gunite.
6. The gunite shall be initially applied to the floor of the swimming pool, to cove and sides up to a height of approximately 300 mm from the bottom, until the reinforcement has been covered. The balance of the sides and coves shall then be shot. All rebound shall be swept and discarded. Excessive application of gunite forming lumps or irregularity shall be removed.
7. When necessary, prior to gunite, the soil floor to be compacted.
8. Reinforcing steel/mesh must be raised to ensure coverage on both sides by the concrete mix.
CURING
During the first five days after the construction of the shell, the shell is to be watered intermittently daily by the contractor.
MOSAIC OR SIMILAR TILE PAVING
Mosaic or similar tiles to be laid at water line with an approximate width of 150 mm.
PAVING SURROUND
The ground to be thoroughly compacted in layers of 150 mm.
ELECTRICAL
1. A timer switch to be fitted.
2. Extra cable to be charged for other than that which is provided for in the contract.
3. Wiring to be done in accordance with local authority regulations.
PUMP/ MOTOR FILTER
Size to be provided as per manufacturer’s instructions.
PIPING AND FITTINGS
All piping to be class 6: when P.V.C. rigid piping is used 50 mm O.D. (outer dimension): or 50 mm I.D. (inner dimension) when Polythene piping is used.
FINAL INTERIOR FINISH
Where marble plaster is used, the final interior finish to be applied by steel trowel to an even finish. The finish not to be less than an average thickness of 6 mm. The marble plaster to consist of an approved mix.
HAND-OVER
On “hand-over”, which must take place in daylight, it is recommended that owners be instructed on how to maintain their pool.
File details come from the government source that posted it. Updated .