Improvement of Headrace Tunnel Excavation Productivity at Jatigede Hydro Electric Power Plant Project
In most part of Indonesia, demand for electrical energy has rapidly been growing since the last two decades. To catch up this increasing demand, Government of Indonesia plans to build a number of electric power plants. The program was divided into two phases or Fast Track Program (FTP), 10,000 MW Pr...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/25222 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | In most part of Indonesia, demand for electrical energy has rapidly been growing since the last two decades. To catch up this increasing demand, Government of Indonesia plans to build a number of electric power plants. The program was divided into two phases or Fast Track Program (FTP), 10,000 MW Project Batch I and 10,000 MW Project Batch II. Under the circumstances, PT. PLN (Persero) is developing a new hydroelectric power plant at Sumedang District, West Java Province. At this area PLN intends to build Jatigede hydroelectric power plant project with an installed capacity of 110 MW (2 x 55 MW). The Contractor who works on the construction of Jatigede Hydro Electric Powerplant Project is Sinohydro-PP Consortium. The Design & Construction supervision is handled by PLN Enjiniring and subconsulted by Fichtner. <br />
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One of critical path in the construction is the excavation of the headrace tunnel. Seen from the geological condition exposed by excavation, the excavation progress of the headrace tunnel is mainly limited by tunnel working space, unforeseenable bad geological conditions and the great change of the surrounding rock type in the tunnel, which results in slow excavation progress. The productivity target from the contract was 2.53 m/day. At the first there was no problems to the productivity and can achieved to 6 m/day. The problems arise when the bad geological conditions faced in the underground impacted the productivity of excavation became 1 m/day. The method analysis of the research is using root cause analysis. <br />
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The problem solving alternatives generated from the causes of the analysis. The alternative solutions then being prioritized using priority matrix. Working method changed is decided to answer the productivity problems and it will automatically give a set of solutions (additional human resources, additional equipment resources, additional material resources). The solution also consider the factors of construction safety, economy and construction schedule. <br />
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Combined the site survey with layout of headrace tunnel, ground and terrain condition along headrace tunnel, scope of land acquisition by dam and supplementary geological investigation data, the method change is adding working faces to the headrace tunnel excavation from the new portal Adit Tunnel No.3. The design was submitted and reviewed by all parties. The implementation is being monitored and the work is distributed to every Person In Charge. Today the Adit Tunnel No.3 is not yet reach the upper headrace tunnel location, the tentative improvement of productivity from the excavation Adit Tunnel it self is 2.1 m/day. Saving from the working method changes is 254.5 billion rupiah, and the cost is 27.3 billion rupiah (assumpted the cost already deal between contractor and PLN). From the analysis we can set the benefit cost ratio is 254.5 billion rupiah / 27.3 billion rupiah or B/C ratio = 9.32 |
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