METODE KERJA PEKERJAAN TEROWONGAN (HEAD RACE TUNNEL) POWER WATERWAYS PADA BENDUNGAN JATIGEDE MATERI PENGAJARAN ASSESSMENT ONLINE POLITEKNIK PU 2020 OLEH ARIF GUNAWAN, ST, MT OLEH

POWER WATERWAY PLTA (Pembangkit Listrik Tenaga Air) Lokasi : Sebelah kanan Bendungan Utama Lantai Inlet : El Terowong penyalur air : D = 4,5 m ; L = m Tinggi terjun : 170 m Tipe turbin : Francis Kapasitas terpasang : 2 x 55 MW = 110 MW Produksi rata-rata : 690 GWH/tahun A. LAYOUT DAN GAMBAR INTAKE HEADRACE #1 HEADRACE #2 120 m GATE SHAFT 55 m Gambar. Tampak Memanjang Power Waterways Republic of Indonesia, Ministry of Public Works Directorat General of Water Works Resources Jatigede Dam Project Up Stream Gambar. Denah Layout Bendungan Jatigede Lithology: Breccia Lithology: Claystone

Republic of Indonesia, Ministry of Public Works Directorat General of Water Works Resources Jatigede Dam Project Metode Kerja Power Waterways PT.Wijaya Karya (Perseo) Tbk. Departemen Sipil Umum B. TAHAPAN POWER WATERWAYS Mulai Head Race Tunnel Shaft Tunnel Surface Excavation (side)Surface Excavation InletSurface Excavation Tahap 1 Slope protectionSlope protectionSlope protection Tahap 2 Inlet portalInlet shaft exc for colar concrete Tahap 3 Underground excavationColar concrete Tahap 4 Protection Pilot hole Tahap 5 Supporting Underground excavation Tahap 6 Protection Tahap 7 Supporting Tahap 8 Lining Lining Tahap 9 Struktur Intake Tahap 10 Struktur Control Buildding Selesai

Republic of Indonesia, Ministry of Public Works Directorat General of Water Works Resources Jatigede Dam Project Metode Kerja Power Waterways PT.Wijaya Karya (Perseo) Tbk. Departemen Sipil Umum C. TAHAPAN HEAD RACE TUNNEL Mulai Latice Girder 3D25 per 80 m Survey and Marking Fore Pooling, Drilling and Charging Linning Concrete Blasting and Ventilating Scalling and Mucking Shotcrete first layer 800 Install Latice Girder and Wiremesh Shotcrete second layer Rock bolting Siklus Berulang per 1.5m Linning Concrete 3523 Selesai Gambar Penampang Tunnel

Republic of Indonesia, Ministry of Public Works Directorat General of Water Works Resources Jatigede Dam Project Metode Kerja Power Waterways PT.Wijaya Karya (Perseo) Tbk. Departemen Sipil Umum Fore Pooling Drilling Charging

Republic of Indonesia, Ministry of Public Works Directorat General of Water Works Resources Jatigede Dam Project Metode Kerja Power Waterways PT.Wijaya Karya (Perseo) Tbk. Departemen Sipil Umum Blasting and Ventilating VentilatingBlasting 4m Upper 2m Lower Semua tenaga dan peralatan harus keluar dari tunnel kecuali petugas peledakan. Debu dan asap hasil beledakan disedot keluar oleh blower. Semua peralatan dan tenaga dapat segera kembali ke tunnel setelah udara bebas dari debu dan asap dan setelah dapat aba2 dari safety officer. BlastingVentilating

Republic of Indonesia, Ministry of Public Works Directorat General of Water Works Resources Jatigede Dam Project Metode Kerja Power Waterways PT.Wijaya Karya (Perseo) Tbk. Departemen Sipil Umum Latice Girder and Wiremesh Install Latice girder Install Wiremesh Upper Lower Setelah lapisan pertama shotcrete kering maka segera dipasang latice girder dan wiremesh memakaispecial hanging truck Install Wiremesh Lattice Girder

Republic of Indonesia, Ministry of Public Works Directorat General of Water Works Resources Jatigede Dam Project Metode Kerja Power Waterways PT.Wijaya Karya (Perseo) Tbk. Departemen Sipil Umum Linning Concrete 10 m Pelaksanaan concrete linning terbagi 2 stage ( bawah dan atas ) dan masing2 dilaksanakan per 5m. Peaksanaan dimulai dari ujung tunnel menuju inlet.

Kondisi 1 (Batuan Breksi)Kondisi 2 (Batuan Claystone) SIKLUS COR TUNNEL No.KegiatanJam Segmen bawah 1Pembersihan4 2Pasang besi8 3Begesting / Stop cor4 4Cor 8 total24 hari1 SIKLUS COR TUNNEL No.KegiatanJam Segmen atas 1Sliding form12 2Pembersihan4 3Pasang besi24 4Begesting / Stop cor24 5Cor 24 total88 hari4 SIKLUS EXCAVATION TUNNEL No.Kegiatan UL Jam 1Survey and Marking11 2Drilling21 3Charging11 4Blasting and Ventilating11 5Scalling21 6Mucking and Loading33 7Shootcrete first layer11 8Instal Latice girder43 9Intsall Wire mesh22 10Shootcrete second layer22 hari Rock bolting 2 2 total 21 j 18 j hari Siklus per jarak 1,5m Per segmen 5m= 3.3 siklus Durasi per siklus=1.6 day Durasi per segmen= 5.4 day SIKLUS EXCAVATION TUNNEL No.Kegiatan UL Jam 1Survey and Marking11 2Drilling21 3Charging11 4Blasting and Ventilating11 5Scalling21 6Mucking and Loading33 7Shootcrete first layer11 8Instal Latice girder43 9Intsall Wire mesh22 10Shootcrete second layer22 hari Rock bolting 2 2 total 21 j 18 j hari Siklus per jarak 1m Per segmen 5m= 5 siklus Durasi per siklus=1.6 day Durasi per segmen= 8.1 day SIKLUS COR SHAFT No.KegiatanJam 1Sliding form48 2Pembersihan24 3Pasang besi48 4Cor 48 total 168 hari7 Metode Kerja Power Waterways Republic of Indonesia, Ministry of Public Works Directorat General of Water Works Resources Jatigede Dam Project PT.Wijaya Karya (Perseo) Tbk. Departemen Sipil Umum D. CYCLE TIME PEKERJAAN

No.Description DimensiQuantityProductifity TimeMonths D ( m' )L ( m' )( m3 )( m' )( days ) (month) Preparation 1Preparation for Head race tunnel Preparation for Shaft tunnel Excavation 1Excavation Head race tunnel (kondisi 1 breksi) Excavation Head race tunnel6.2872, (kondisi 2 claystone) 2Pilot Hole for Shaft tunnel ( estimated )1.0 3Excavation Shaft tunnel , Concrete 1Lower Linning Head race tunnel Upper Linning Head race tunnel , Shaft tunnel structure , Intake structure--2,266( estimated )3.0 5Control building structure--567( estimated )2.0 Metode Kerja Power Waterways Republic of Indonesia, Ministry of Public Works Directorat General of Water Works Resources Jatigede Dam Project PT.Wijaya Karya (Perseo) Tbk. Departemen Sipil Umum E. JADWAL PEKERJAAN