Handbook on Construction Techniques by Sasaki Shotaro;Jain Rajat;

Author:Sasaki, Shotaro;Jain, Rajat;
Language: eng
Format: epub
Publisher: Asian Development Bank Institute
Published: 2016-09-15T00:00:00+00:00

Source: HPPCL Documents for Sawra Kuddu HEP (111 MW) – an ADB funded project

58. Surface Project Activities

• Barrage and/or trench weir (in place of barrage in medium size projects)

• Other civil works (on-ground) in the project area includes:

Dumping areas.

Resettlement areas.

Development of portals for working, equipment.

Camps, offices, workshops etc.

Access roads, highway.

Temporary bridges.

Buildings.

Development of quarry for construction material.

59. Electro Mechanical Works: The hydropower project contains several electrical mechanical equipment such as the generator (See Glossary 48), the stator (See Glossary 113) and the turbines (See Glossary 127). Besides there, there are several mechanical equipment used in the hydropower projects such as gates of various types: diversion tunnel gates, barrage and sluice gates, barrage bay and sluice bay stop logs, trash racks (See Glossary 126) and trash cleaning machine, intake gates, sedimentation chamber gates, flushing conduit gates, emergency valves, main inlet valves, draft tube gates, outlet gates, and access doors.

60. The ROR hydropower projects usually generate electricity at 11/33 kV voltages and then step up to 132 kV or 220 kV in the switchyard substation using a step up transformer. The power evacuation lines emanate from the switchyard’s terminating gantry and then travel to a pooling substation where the power generation from other generators is pooled to interstate power evacuation lines after another step-up to 400 or 765 kV.

61. The Flow Chart in Figure 10 displays activities as they progress while constructing a hydropower generation project. On the left are the “Steps” involved in the process of project implementation such as “Pre Construction, Facilities Setup, Construction, Erection, and Commissioning”. The “Tasks” performed are numbered in a sequential manner i.e. 1-17 (as shown by arrows). Some “Tasks” are grouped together in a particular “Step” in the order of their occurrence in a project cycle. Their placement (i.e. 1&3, 2&4) has no particular significance. For example, The construction related environmental impacts usually occur during implementation of “Tasks” 2-17. These “Tasks” are usually performed by the Engineering Procurement and Construction (EPC) contractor.

Figure 10: Process Flow Chart for Construction of Hydropower project

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