Construction work concerned with the design and construction of such public works as dams, roads or bridges or the construction of large structures...

Concrete work comprises of operations carried out in the erection of monolithic concrete and reinforced concrete structures and installations made of cement concrete. Concrete work includes the following basic processes: preparation of the concrete mix; delivery of the mix to the construction site; feeding, distribution, and compaction of the mix in the formwork (molds); the curing of the concrete while it is hardening; and quality control of the concrete work....

Earthworks are engineering works created through the moving or processing of parts of the earth's surface involving quantities of soil or unformed rock. often to construct embankments, compacted surfaces for other construction activities or terracing....

specialized construction work that is performed during the erection or reconstruction of buildings or structures intended for various purposes and that entails the installation of electric wiring and electrical equipment. The electric wiring may be overhead power lines, cable lines, current leads, or interior wiring. Examples of electrical equipment include electric machinery, distribution centers, and control consoles....

All plumbing related activities, including installation and maintenance to the system of pipes, tanks, fittings, and other apparatus required for the water supply, heating, and sanitation in a building. ...

Preparation and surfacing of roadways with Bitumen, paving and the repair of existing roads...

The erection or repair of steel structures or buildings...