Reflections Koi Pond Experts Northwest UK
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Breaking ground
Due to limited access a three tonne excavator was used to clear the ground and remove the spoil. Existing retaining walls and concrete bases were removed using a hydraulic “pecker”. The concrete was found to be double wired with A393 mesh and proved to be stubborn to be removed. Persistence prevailed and after 12 days we had a hole. Levels were taken from our datum point and checked against excavation depths, where any adjustments that needed to be made, were necessary. In total 350 tonne of spoil was removed from the site.
12000 Gallon Koi Pond Project - Construction
Outlined over the pages below is a detailed description of how Reflections constructed a 12,000 gallon Koi pond.
12000 Gallon Pond Home Page
Pond Construction
Filtration Installation
Finishing Touches
Pond Building Landscaping Filtration Automation GRP Liner Maintenance
pond building pond landscaping filtration automatic pond grp lining maintenance
Web Design SEO © Reflections Garden Pond Building Koi Pond Design Pond Construction GRP Preformed Pond Liner
Prime Base
On this project our chosen filtration system dictated what kind of concrete base would be deployed. We will go into these considerations later. Two bottom drains were needed to give us two 4” outlets, these drains were also to be aerated via diffuser membranes. A 300 mu Visqueen sheet was laid to the whole excavation – this has two benefits:
1/ to keep the water in the concrete for initial cure
2/ to keep the entire construction dry for GRP application
Two 225mm discharge sumps with 4” lines were installed into prepared channels and concreted to correct locations and levels. Reinforcing bar was added to the sump locating concrete which would then tie to the main pond base.
A C35 Kn base was then laid to the entire area. This concrete was compacted using a 1.5” vibrating poker. The base was levelled using an aluminium tamp.Many thanks go to Precision Poured Concrete for getting the concrete to a difficult location.
Wall Construction
Our chosen method for constructing this Koi pond was to lay dense concrete blocks. The blocks were to be laid flat which gives a 225mm wide wall x 100mm course. The Koi pond TPR & mid water filter feed were located into this block work and the pipe work was left as “stubs” to be utilised when the final connections were necessary. The entire perimeter of the pond wall was backfilled with 10mm pea shingle which allows drainage and also protection of the pipe work.
A render mix of three sand : one cement : 1.5 kilo of cem FIL fibre was used to render the blockwork to provide a suitable finish for the GRP (fibreglass) to be applied. The cem FIL is a special alkali resistant fibre that when utilised correctly will provide an ideal mechanical key for the GRP. All the walls were coated with a primer prior to the render application.
The Koi pond base required that falls be laid to each Koi pond drain to facilitate waste removal. The base dishing was accomplished using 6m3 of ready mixed flooring screed, this screed also had the fibres added. Continue..