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Sheet Pile (Dinding Turap)
gudang
SIVA1
kapal
sheet pile
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Sheet Piles
~ turap baja atau kayu dipancang ke dalam tanah, yang membentuk dinding menerus
gudang
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kapal
sheet pile
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Sheet piles
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Z piles
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Interlocking steel sections
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Sheet piles - apa, dimana dan kapan
� Dinding fleksibel pelat baja yang interlocking - single atau double
� Bagian atas dapat
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� Bagian atas dapat ditahan oleh satu atau lebih anchors dan ties
� Terutama dipakai untuk dermaga & galian sementara
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Cofferdams
� Forces due to Soil Loads
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Cofferdams
� Traditional Sheet Pile Shapes
Z-Type (Z) Larson / “U” Type (U)
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Z-Type (Z)Used for intermediate to deep
wall construction
Larson / “U” Type (U)Used for applications similar
to Z - Type
Flat / Straight Type (SA), (S)Used for filled cell construction
Arch shaped & lightweightUsed for shallower wall
construction
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Cofferdams� Typical types of interlocks
Ball & Socket (BS) Single Jaw (SJ) Double Jaw (DJ)
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Hook & Grip (HG) Thumb & Fingerone point contact (TFX)
Double Hook (DH) Thumb & Fingerthree point contact (TF)
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Dinding Turap (sheetpile wall)
Secara garis besar turap dikelompokkan dalam jenis/tipe:
� Dinding turap kantilever (cantilever sheetpile wall): pada tanah
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sheetpile wall): pada tanah pasir(sand) dan lempung(clay)
� Dinding turap berangker (anchored sheetpile wall): pada tanah pasir(sand) dan lempung(clay)
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CANTILEVER SHEETPILE
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CANTILEVER SHEETPILE
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Turap Kantilever(cantilever sheetpile)
� Diagram tekanan tanah pasir pada turap kantilever
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Tahap perencanaan (design steps)
� Tahap perhitungan dilakukan berdasar gambar diagram tekanan di atas
� Menghitung koefisien tekanan tanah aktif dan pasif
φφ sin145tan 2 −= −=K
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φφφ
φφφ
sin1
sin1
245tan
1
sin1
sin1
245tan
2
2
−+=
+=
=
+−=
−=
p
ap
a
K
KK
K
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Keseimbangan turap
� Jumlah gaya ke arah horisontal = 0
dimana P = luas diagram ACDE
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� Dari persamaan ini didapat L5
� Jumlah momen terhadap dasar turap = 0
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� Substitusikan pers 4, 7 & 9 ke pers 10
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Kedalaman pemancangan
� Dari perhitungan di atas dapat diketahui kedalaman teoritik dan aktual
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� Diagram tekanan yang sesungguhnya berdasarkan perhitungan dapat digambar
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Momen maksimum
� Momen maksimum terjadi pada gaya lintang = 0, yaitu di titik berjarak z’ dari E
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� Momen maksimum dapat dihitung sbb:
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Dimensi Turap
� Dimensi turap dapat ditentukan berdasarkan momen maksimum yang harus ditahan.
� Bila tegangan ijin material turap = σa, maka diperlukan modulus penampang (section modulus) = S
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modulus) = S
� Untuk turap baja dimensi dapat ditentukan berdasar tabel profil turap baja.
a
maksMS
σ=
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� Diagram tekanan tanah lempung (clay) pada turap kantilever
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Tahap perencanaan (design steps)
� Pada lempung undrained harga Ka=Kp=1� Tekanan tanah lateral di belakang dinding di
bawah dasar (dredge line)
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� Tekanan tanah lateral di depan dinding di bawah dasar (dredge line)
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� Perhitungan tekanan σ1 dan σ2dilakukan sama dengan perhitungan turap kantilever pada tanah pasir
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Keseimbangan Turap
� Jumlah gaya ke arah horisontal = 0
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dimana P = luas diagram tekanan ACDE
� Dari persamaan di atas didapat
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� Jumlah momen terhadap dasar turap=0
� Substitusikan pers 4 ke pers 5
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� Hitung D:
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Momen maksimum dan dimensi turap
� Momen maksimum terjadi pada gaya lintang = 0, maka jarak dari dredge line didapat z’ = P/σ6
� Momen maksimum:
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� Dimensi turap dapat ditentukan bahwa modulus penampang yang diperlukan:
a
maksMS
σ=
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Tabel: modulus penampang & momen inertia
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Belajar
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Jangan tunggu sampai menit terakhir.
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Exams
My mama always said, “Exam is like a box of chocolates; you never know what you
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of chocolates; you never know what you are gonna get”
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