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PEKERJAAN
PEMINDAHAN TANAH
Jenis-jenis Pekerjaan
Pemindahan Tanah
 Pembersihan lahan  clearing and grubbing
 Membuang semak, bekas bangunan dsb.
 Memotong dan membuang tanaman, pohon, tunggul dan
akar pohon dsb
 Pengupasan lapisan tanah atas  top soil stripping
 Top soil (tebal 15 cm) dikupas dan dikumpulkan pada satu
tempat untuk nantinya dipergunakan lagi
 Penggantian tanah yang tidak memenuhi syarat
 Pekerjaan galian dan timbunan  cut and fill
 Menggali dan memindahkan tanah
 Menghampar/menimbun dan memadatkan tanah dalam
lapisan dengan ketebalan tertentu (15 ~ 30 cm dengan
kepadatan 90 ~ 95 % )
Peralatan Mekanis Pekerjaan Tanah
 Tractor mounted dozer, pusher, ripper
 Scraper
 Front end loader
 Belt loader, wheel excavator
 Power excavator
 Hauler
 Motor grader
 Compactors
Pemilihan bergantung kepada:
 Spesifikasi peralatan
 Penggunaan/operasional alat
 Kemampuan produksi
 Biaya
Operasi-operasi Dasar Pemindahan
Tanah
 Melonggarkan/melepaskan tanah (padat) agar dapat digali
 Menggali pada daerah galian :
 Borrow pit
 Daerah potongan/cut area
 Mengangkut tanah galian menuju lokasi timbunan akhir
 Membuang/menimbunkan/menghamparkan tanah di daerah :
 Timbunan/embankment
 Tempat pembuangan (dumping area)
 Menyelesaikan bentuk permukaan tanah/material sesuai
spesifikasi pekerjaan
Siklus Kerja (Work Cycle) Pada
Pekerjaan Pemindahan Tanah
 Waktu Siklus (Cycle Time)  CT : waktu yang diperlukan untuk
menyelesaikan 1 siklus kegiatan operasi
buang
angkut
gali
muat
Kembali kosong
1 siklus gali-buang
Siklus Operasi Kombinasi
dump
haul
excavate
dozing
Daerah interaksi peralatan
Kombinasi siklus
spread
compact
Nilai Waktu Siklus Hauling Unit
CT = LT + HT +DT + RT + ST
 LT = load time : waktu untuk memuat hauling unit
sampai penuh
 HT = hauling time : waktu untuk mengangkut sampai
membuang
 DT = dumping time : waktu yang diperlukan untuk
operasi membuang tanah
 RT = return time : waktu yang diperlukan hauling unit
untuk kembali (dalam keadaan kosong)
 ST = spotting time, biasanya fix
Perhitungan Produktifitas Kerja
 Secara umum :
Q = qnfE
 Q = work volume per jam[m3/jam][m2/jam][m/jam]
 q = volume pekerjaan rata-rata per 1 siklus kerja
 N = jumlah siklus kerja dalam 1 jam
 f = koefisien perubahan volume tanah
 E = Efisiensi kerja
 Volume kerja dihitung per jam operasi alat (bukan jam kerja
sebenarnya/net)
n = 60/Cm (Cm dalam menit) atau
n = 3600/Cm (Cm dalam detik)
Cm = waktu siklus
n = jumlah siklus dalam 1 jam operasi
Produktifitas dan Efisiensi Peralatan
 Produktifitas puncak (maximum/teoritis) = qp
 Produktifitas normal = qn
qn = fw x qp
fw = working efficiency factor
 Produktifitas aktual = qa
qa = fa x qp = fw x fj x qp = fj x qn
fj= job-management factor
Equipment Efficiency Factors
Kondisi
Umum
Working
efficiency
Job
mngmt Combined Efficiency - fa
fw fj
Job management
condition
Working
Condition Baik Rata-rata Buruk
Baik 0.90 1.00 baik 0.90 0.77 0.59
Rata-rata 0.80 0.85 rata-rata 0.80 0.68 0.52
Buruk 0.70 0.65 buruk 0.70 0.60 0.45

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3. Pekerjaan Pemindahan Tanah (Lanjutan Pertemuan 2).ppt

  • 2. Jenis-jenis Pekerjaan Pemindahan Tanah Pembersihan lahan clearing and grubbing Membuang semak, bekas bangunan dsb. Memotong dan membuang tanaman, pohon, tunggul dan akar pohon dsb Pengupasan lapisan tanah atas top soil stripping Top soil (tebal 15 cm) dikupas dan dikumpulkan pada satu tempat untuk nantinya dipergunakan lagi Penggantian tanah yang tidak memenuhi syarat Pekerjaan galian dan timbunan cut and fill Menggali dan memindahkan tanah Menghampar/menimbun dan memadatkan tanah dalam lapisan dengan ketebalan tertentu (15 ~ 30 cm dengan kepadatan 90 ~ 95 % )
  • 3. Peralatan Mekanis Pekerjaan Tanah Tractor mounted dozer, pusher, ripper Scraper Front end loader Belt loader, wheel excavator Power excavator Hauler Motor grader Compactors Pemilihan bergantung kepada: Spesifikasi peralatan Penggunaan/operasional alat Kemampuan produksi Biaya
  • 4. Operasi-operasi Dasar Pemindahan Tanah Melonggarkan/melepaskan tanah (padat) agar dapat digali Menggali pada daerah galian : Borrow pit Daerah potongan/cut area Mengangkut tanah galian menuju lokasi timbunan akhir Membuang/menimbunkan/menghamparkan tanah di daerah : Timbunan/embankment Tempat pembuangan (dumping area) Menyelesaikan bentuk permukaan tanah/material sesuai spesifikasi pekerjaan
  • 5. Siklus Kerja (Work Cycle) Pada Pekerjaan Pemindahan Tanah Waktu Siklus (Cycle Time) CT : waktu yang diperlukan untuk menyelesaikan 1 siklus kegiatan operasi buang angkut gali muat Kembali kosong 1 siklus gali-buang
  • 6. Siklus Operasi Kombinasi dump haul excavate dozing Daerah interaksi peralatan Kombinasi siklus spread compact
  • 7. Nilai Waktu Siklus Hauling Unit CT = LT + HT +DT + RT + ST LT = load time : waktu untuk memuat hauling unit sampai penuh HT = hauling time : waktu untuk mengangkut sampai membuang DT = dumping time : waktu yang diperlukan untuk operasi membuang tanah RT = return time : waktu yang diperlukan hauling unit untuk kembali (dalam keadaan kosong) ST = spotting time, biasanya fix
  • 8. Perhitungan Produktifitas Kerja Secara umum : Q = qnfE Q = work volume per jam[m3/jam][m2/jam][m/jam] q = volume pekerjaan rata-rata per 1 siklus kerja N = jumlah siklus kerja dalam 1 jam f = koefisien perubahan volume tanah E = Efisiensi kerja Volume kerja dihitung per jam operasi alat (bukan jam kerja sebenarnya/net) n = 60/Cm (Cm dalam menit) atau n = 3600/Cm (Cm dalam detik) Cm = waktu siklus n = jumlah siklus dalam 1 jam operasi
  • 9. Produktifitas dan Efisiensi Peralatan Produktifitas puncak (maximum/teoritis) = qp Produktifitas normal = qn qn = fw x qp fw = working efficiency factor Produktifitas aktual = qa qa = fa x qp = fw x fj x qp = fj x qn fj= job-management factor
  • 10. Equipment Efficiency Factors Kondisi Umum Working efficiency Job mngmt Combined Efficiency - fa fw fj Job management condition Working Condition Baik Rata-rata Buruk Baik 0.90 1.00 baik 0.90 0.77 0.59 Rata-rata 0.80 0.85 rata-rata 0.80 0.68 0.52 Buruk 0.70 0.65 buruk 0.70 0.60 0.45