SEPERTI INILAH BEDUNGAN LEUWIKERIS DIBUAT
Summary
TLDRThe script discusses the construction of the Lewi Keris dam, highlighting its ability to hold back millions of cubic meters of water. It details the dam's zoning materials, with the core being a clay layer that prevents seepage. The construction process involves careful compaction with heavy machinery and the use of various materials like sand and aggregate from nearby quarries. The outermost layer, or riprap, protects the dam from erosion. The script also touches on the dam's social impact and its significance as a national engineering feat.
Takeaways
- 🌊 The dam is designed to withstand millions of cubic meters of water from the river.
- 🔍 The secret lies in the zoning of materials used in dam construction, with each zone serving a specific purpose.
- 🟤 The core of the dam consists of clay, characterized by a brown color and smooth texture, with a plasticity index over 15%.
- 🚫 Caution is needed as the clay is often accompanied by a coarser, whitish material with high permeability, which can lead to seepage.
- 🏗 The clay material is sourced from borrow areas 1.5 to 2.5 km away and compacted using heavy machinery.
- 🔧 The construction process involves multiple layers, including a fine filter zone to prevent piping and a coarse filter zone for drainage.
- 🏞 The rockfill zone provides counterweight to maintain the dam's stability against water and soil pressure, as well as seismic forces.
- 💥 Rockfill material is obtained through blasting at quarries, with specific configurations to ensure the right size for the dam's structure.
- 🌲 The random zone at the dam's base replaces some rockfill with a mix of hard and weak rocks, which can become finer due to weathering.
- 🛠 The outermost layer, the riprap, serves as a protective barrier against water impact, wave erosion, and rain, with interlocking stones installed manually.
- 🏗️ The construction of the Lewi Keris dam is a significant engineering achievement for Indonesia.
Q & A
What is the primary function of the core material in the embankment dam?
-The core material in the embankment dam serves as a waterproof layer, which is crucial for preventing the seepage of water through the dam.
What is the characteristic feature of the clay material used in the core zone?
-The clay material used in the core zone is characterized by its brown color, smooth texture, and a plasticity index (PI) of more than 15%.
Why is the material accompanying the core material referred to as 'toof'?
-The accompanying material is referred to as 'toof' because it has a slightly whitish color, coarser texture, and high permeability, which can potentially cause the core material to erode.
How far from the dam location is the borrow area for the core material located?
-The borrow area for the core material is located between 1.5 to 2.5 km from the dam site.
What machinery is used for spreading the core material during construction?
-A bulldozer of the Komatsu brand is used to spread the core material with a thickness of 30 cm.
What is the role of the fine and coarse filter zones in the dam?
-The fine and coarse filter zones act as drainage guides, directing seepage from the upstream to the downstream of the dam while preventing the fine particles from the core material from being washed out.
What are the maximum diameters for the materials used in the fine and coarse filter layers?
-The fine filter layer uses sand with a maximum diameter of 12.7 mm, while the coarse filter layer uses aggregate with a maximum diameter of 37.5 mm.
What is the purpose of the rockfill zone in the dam's structure?
-The rockfill zone serves as a counterweight to maintain the stability of the dam against water pressure, soil pressure, and seismic forces.
Where is the rockfill material sourced from and how is it obtained?
-The rockfill material is sourced from the Pangajar Quarry, which is 14 km away from the dam site, and is obtained using blasting methods with predetermined configurations.
What is the function of the random zone in the dam?
-The random zone replaces part of the rockfill material at the downstream end of the dam, providing the same function but with a mix of hard and weak rocks that can easily break down into finer particles.
How is the riprap layer installed and what is its purpose?
-The riprap layer is installed manually by workers, using stones ranging from 10 to 30 cm in size. It serves as the outermost layer of the dam, protecting it from water impact, waves, erosion, and rain.
Outlines
🌉 Construction Techniques of Lewi Keris Dam
The script discusses the construction of the Lewi Keris dam, focusing on the zoning materials used in its formation. The dam is designed to hold back hundreds of millions of cubic meters of water from the river. The core of the dam is made of clay, which serves as a waterproof layer. The clay used is of a brown color with a smooth texture and a plasticity index over 15%. Care must be taken as this clay is often accompanied by a coarser material with high permeability. The materials are sourced from specific locations and compacted using heavy machinery to achieve high productivity. The dam also includes filter zones to prevent piping and a rockfill zone for stability against water and soil pressure. The script also mentions the use of random materials and the importance of the outermost layer for protection against erosion. The construction process is continuous, with two shifts to avoid operator fatigue and ensure safety.
🚧 Safety and Social Considerations in Dam Construction
The second paragraph emphasizes the importance of safety and social considerations during the construction of the Lewi Keris dam. It highlights the need for critical location mapping, installation of warning signs, and the use of flagmen and other supporting instruments to prevent accidents. The dam's construction is described as a significant work for Indonesia, taking place near communities with diverse educational backgrounds. The script underscores the project's social impact and the importance of community engagement and safety measures to ensure the well-being of both workers and local residents.
Mindmap
Keywords
💡Dam
💡Zoning Material
💡Plasticity Index (PI)
💡Permeability
💡Compaction
💡Filter Zone
💡Rockfill
💡Blasting
💡Interlock
💡Erosion
💡Disposal Area
Highlights
The dam can hold back hundreds of millions of cubic meters of water from the river.
The secret lies in the zoning of materials used in dam construction.
The core of the dam consists of different zoning materials, each with specific functions.
The central part of the dam, known as the core, serves as a waterproof layer.
The core material is a type of clay with a plasticity index greater than 15%.
Care must be taken as the core material is often accompanied by a material with high permeability.
The core material is sourced from borrow areas located 1.5 to 2.5 km away.
Compaction is done with a 12-ton Sakai roller, with 10 passes to ensure the material's integrity.
The dam's productivity can reach 4000 m³ per hour, working from morning to night.
The sensitive nature of the core material requires careful monitoring of water content and permeability.
The filter zone surrounds the core to direct seepage and prevent piping.
The filter zone consists of fine and coarse materials to ensure stability and prevent erosion.
The rockfill zone provides counterweight to maintain the dam's stability against water and soil pressure.
Rockfill materials are sourced from quarries and undergo large-scale testing for quality assurance.
The random zone replaces part of the rockfill with a mix of hard and weak rocks.
The riprap zone is the outermost layer of the dam, protecting it from erosion and wave impact.
Riprap installation must be tightly interlocked to ensure the dam's surface protection.
The dam construction operates 24/7 with two shifts to prevent operator fatigue and accidents.
Social support is provided due to the work's proximity to the community.
The Lewi Keris Dam is a significant engineering achievement for Indonesia.
Transcripts
Bendungan urugan inti lempung dapat
menahan ratusan juta Meter kbik air yang
mengalir dari sungai Bagaimana bisa
Rahasianya terdapat pada zoning material
urugan pembentuk Bendungan tersebut
tubuh Bendungan Lei keris terdiri dari
en zoning material timbunan dengan
fungsinya masing-masing zona inti
lempung terdapat pada Pusat Bendungan
dengan fungsi sebagai lapisan kedap air
zona intim merupakan material tanah liat
berwarna coklat dengan tekstur halus dan
lengket umumnya material ini memiliki
plasticity index atau Pi yang lebih dari
15%. perlu hati-hati karena material
lempung ini biasanya disertai dengan
material toof yang mana material toof
tersebut berwarna agak keputihan
bertekstur lebih kasar yang mana
material tersebut memiliki sifat
permabilitas tinggi yang merawan
kebotoran material inti lempung diambil
dari borow yang berlokasi 1,5 sampai 2,5
km dari lokasi penimbunan material
dihampar menggunakan bulldozer
merkomatsu dengan ketebalan hampar 30 cm
pemadatan dilaksanakan dengan du unit SH
roller merek Sakai dengan kapasitas 12
ton dengan jumlah lintasan 10 kali
dengan komposisi alat tersebut
produktivitas timbunan dapat mencapai
4000 m k perhi dari jam pagi sampai jam
10 malam karena Inung ini sifat sensitif
maka pelaksanaan zona inti harus selalu
memperhatikan kadar air pepadatan dan
permeabilitas zona filter halus
menyelimuti zona inti lempung sebagai
pengarah drainase rembesan dari hulu ke
hilir Bendungan zona filter kasar berada
di luar zona filter halus dengan fungsi
yang sama kedua zona filter ini
sekaligus menjaga material zona inti
dari terjadinya piping yaitu keluarnya
butiran halus dari zona inti filter
halus merupakan material pasir
berdiameter maksimal 12,7
mm filter kasar merupakan material
agregat berdiameter maksimal 37,5 mm
filter harus memiliki kadar lumbur
kurang dari 5% filter halus dan filter
kasar diambil dari Kuari Gunung
Galunggung yang berjarak 45
km zona rockfil atau batu terdapat di
luar lapisan filter yang berfungsi
sebagai counterweight menjaga stabilitas
Bendungan dari tekanan air tekanan tanah
maupun gempa umumnya parameter yang
perlu dipenuhi adalah dimensi gradasi
nilai sudut geser nilai kuat tekan
batuan atau ucs abrasi ketahanan sulfat
dan parameter lainnya yang didapatkan
dari Hasil pengujian large scale
material rockfel diambil dari Kuari
gunung pangajar yang berjarak 14 km dari
lokasi Bendungan proses pengambilan
material menggunakan metode blasting
dengan konfigurasi titik yang sudah
ditentukan sehingga akan menghasilkan
ukuran batu yang sesuai untuk memenuhi
kebutuhan timbunan dilakan rata-rata
titik blasting sebanyak 300 sampai 500
titik setiap harinya material dihampar
tebal 1 M menggunakan bulldoser kemudian
dipadatkan menggunakan fibro roller
dengan jumlah lintasan sebanyak 4 kali
penimbunan rockfel ini dilakukan selama
24 jam dengan produktivitas dapat
mencapai 10.000 m³ per hari zona random
terdapat pada Hilir Bendungan
menggantikan sebagian material rockfel
dengan fungsi yang sama material random
berupa campuran dari batuan keras dan
batuan rapuh batuan rapuh mudah hancur
menjadi butiran lebih halus akibat
pemadatan dan pengaruh perubahan cuaca
adanya campuran material lebih halus
membuat zona random kurang baik
ditempatkan di Hulu Bendungan karena
berpotensi tercuci atau wash out akibat
pengaruh naik turun air sumber material
random pada Bendungan lukeris berasal
dari disposal area hasil galian bangunan
spillway yang berjarak 2,5 KM material
hasil galian spillway yang bergradasi
baik dimanfaatkan kembali sebagai
material timbunan untuk langkah
efisiensi penggunaan material sekitar
zona rirep merupakan lapisan terluar
tubuh bendungan yang berfungsi sebagai
pelindung permukaan Bendungan dari
tabrakan air gelombang erosi dan hujan
agar kemiringan ripap lurus dipasang
boplang sebagai acuan para operator Rip
Rip harus dipasang secara kuat dan rapi
maka pemasangan ripp harus benar-benar
rapat dan batuan yang saling mengunci
satu sama lainnya atau bisa disebut
interlock interlock menggunakan batuan
10 sampai 30 cm dipasang di cela-cela
antara batuan prpr pemasangan interlock
ini dikerjakan secara manual oleh 12
orang pekerja dengan produktivitas 700 m
per hari pekerjaan urugan Bendungan
dilaksanakan dalam 24 jam setiap hari
dengan dua shift operasi pembagian shif
dilakukan untuk menghindari kelelahan
atau fetig pada operator alat berat yang
dapat menyebabkan kecelakaan bekerja
sebagai pengaturan lalu lintas dilakukan
pemetaan lokasi krusial serta rawan
kecelakaan pemasangan rambu penempatan
flagman dan instrumen pendukung lain
singgungan sosial merupakan hal biasa
karena pekerjaan berada dekat dengan
lingkungan masyarakat dengan tingkat
sosial pendidikan
heterogen Bendungan Lewi keris sebuah
karya untuk Indonesia
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