Five indoor swimming pools were selected to provide a different range of basin capacity of pools, number .... due to its short-term sanitation effects [9, 15, 28].
backwashing, and filtration rate (higher flows lower separation efficiency). The cleaning of a filter bed clogged with solids is referred to as backwashing. It is.
chlorine content of your swimming pool sample. A compound called DPD (N, N-
diethyl-p-phenylenediamine) is reacted with the chlorine in each sample.
May 14, 2010 - Children with a high versus low cumulative swimming pool attendance ..... not affect the probability of attending swimming pools later in life.
concludes that the Water and Food Challenge Program has in its short life succeeded in drawing ..... conservation agriculture can help mitigate this intense land and water degradation. However ...... through inverse reasoning, from the prior associat
Table S13: Total number of variants called by pool and enrichment tech- nique before duplicate removal. For each pool size and sequence enrichment.
and David H. Yoon ..... See Bremer 1996: and Jones, Bremer, and Singer 1996. 10. For three large ... For a summary of the capability index, see Singer 1990. 16.
The 25m long public swimming pool at Monto, two hours west of Bundaberg, Queensland had sunk into the ground by up to 20
PROJECT PROFILE Q13 N060
Large Swimming Pool Re-levelled INDUSTRY
Council STRUCTURE
Pool PROBLEM
Sinking pool LOCATION
QLD, Australia DURATION / YEAR
10 days / 2011 TECHNOLOGY
Uretek Deep Injection & Uretek Slab Lifting BUSINESS UNIT
Mainmark Australia
Summary The 25m long public swimming pool at Monto, two hours west of Bundaberg, Queensland had sunk into the ground by up to 200mm toward the deep end. The water would no longer drain to the shallow end, so the pool reticulation system would not work and the pool water could not be filtered properly. The pool had been built in sections of precast concrete. Using a carefully sequenced program of expanding resin injections into the foundation ground under the pool the team brought the complex pool structure right back to level without mishap.
Objectives The objective was to get the pool as close to level as possible while avoiding over-lifting at any stage and disturbing the joints between sections of the pool structure.
Solution The Regional Council had 3 options: 1. Re-do the plumbing and replace the filter system (very costly) but the pool would still be out of level, 2. Build a new aquatic centre (for millions of dollars), or 3. Re-level the pool with Uretek polymeric injections.
We were commissioned to lift the pool back to level. The pool had been built in precast concrete sections. The walls were precast with flat bases and concrete infill precast sections formed the floor of the pool. The floor joints were set down with mastic filler and vertical joints were mastic filled. The fact that the sections were pre-cast dictated a need for extremely precise and careful lifting. Over-lifting any one section could break the joint. Also, due to its large precast base, the wall could easily rotate inwards or outwards. Additionally, as the floor slab was sitting on a step joint, the internal slab could not be lifted as this could have caused this slab to lift at the joint. This meant a slow process of lifting each precast wall section a small amount at a time to slowly bring the pool back to an acceptable level. Then the correction of levels was proved by pouring water in the gutter. The water in the gutter flowed to the shallow end again. Then the voids under the internal pool slab were filled very slowly with great care. The result was extremely successful. And the Regional Council saved a great deal of money compared with the alternatives. The chief council engineer congratulated the team on this excellent and problem-free result. Above: Ten days in the blazing Queensland sun made a sun-shielding tent a necessity! An excellent result made it worthwhile!
