There are couples of design of concrete drain in construction, such as berm drain, toe drain, embankment shoulder drain, cascaded drain and etc. All of them are made from concrete, the mixture of the concrete is depending on what drain to be constructed. Concrete drain can be constructed by hand, without any machine, concrete can be mixed by hand as well if the quantity used is less. Sometimes concrete drain can be spoiled or failure, concrete drain such as cascaded drain is connecting with the concrete curb, if the concrete curb doesn’t function well to control velocity of the water flow, the high speed of water flow might destroy the concrete cascaded drain, so rectification work for concrete drain has to be carried on.

How To Rectify Eroded Concrete Drain

1) The eroded concrete drain shall be excavated and form benching with a case backhoe.

2) Suitable earth shall be filled in layer and compact with a plate compactor.

How To Build Concrete Drain

1) After completion of reinstatement of the eroded concrete drain to the profile, excavation of the concrete cascading drain shall be carry out by case backhoe.

2) The bottom trench earth shall be levelled and trimmed manually by general workers for laying for 50mm thick lean concrete.

3) After the lean concrete had set, erection of formwork shall be carried out.

4) BRC reinforcement of the correct dimensions shall be installed.

5) Grade 20 concrete shall be laid and compact with poker vibrator up the drain bottom slab.

6) After the base concrete had set, concrete drain side wall reinforcement and formwork shall be installed.

7) Grade 20 concrete shall be delivered, laid and compact to specification.

8 ) Prior to all concreting works, formwork and reinforcement shall be inspected by the Engineer or his representative to ensure that the formwork and reinforcement are properly aligned and secured in place.

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