Perencaan Bangunan Pengelak (Cofferdam) Pada Proyek Siphon Salamdarma, Kabupaten Indramayu

Zakariyya, Muhammad (2025) Perencaan Bangunan Pengelak (Cofferdam) Pada Proyek Siphon Salamdarma, Kabupaten Indramayu. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangunan Siphon Salamdarma di Kabupaten Indramayu merupakan bagian dari proyek revitalisasi sistem irigasi yang bertujuan mengatasi defisit pasokan air pertanian, khususnya di daerah aliran Sungai Cipunagara. Untuk menjamin kelancaran proses konstruksi struktur utama, diperlukan bangunan pengelak berupa cofferdam yang mampu mengalihkan aliran sungai dan menciptakan kondisi kerja yang kering. Proyek akhir ini bertujuan merancang cofferdam yang stabil, aman terhadap tekanan tanah dan air, serta mampu mengalirkan debit banjir rencana tanpa risiko limpasan. Metode yang digunakan mencakup analisis hidrologi untuk menentukan debit banjir rencana menggunakan pendekatan distribusi probabilistik Log Pearson Tipe III dan hidrograf satuan sintetik Nakayasu. Evaluasi stabilitas struktur dilakukan melalui analisis tekanan lateral tanah dan tekanan air, perhitungan keseimbangan momen, serta verifikasi kekuatan strut terhadap tekuk sesuai standar teknis. Analisis rembesan dilakukan secara manual dan dengan bantuan perangkat lunak. Hasil proyek akhir ini menunjukkan bahwa debit puncak rencana untuk periode ulang 10 tahun sebesar 562.48 m³/s dengan baseflow 4.15 m³/s, serta tinggi muka air rencana berada pada elevasi +21.02 setelah penyempitan Sungai Cipunagara menjadi 29.62 m karena dimensi cofferdam 30.3 m melintang pada Sungai Cipunagara serta direncanakan elevasi puncak cofferdam +22.00 dengan tinggi jagaan 0.98 m. Kedalaman pemancangan awal sebesar 2.77 m kemudian dikalikan dengan faktor keamanan 1.3, sehingga diperoleh kedalaman desain akhir sebesar 3.6 m. Struktur cofferdam dirancang menggunakan profil sheet pile NS-SP-IVW 600.200.18 dan sistem strutting tiga layer, masing-masing berjarak vertikal 2 meter dan horizontal 4 meter. Hasil verifikasi terhadap tekuk menunjukkan bahwa profil WF 400.200.8.13 mampu menahan beban lateral dan memenuhi syarat stabilitas. Kata kunci: Cofferdam, Steel Sheet Pile, Strutting, Konstruksi Bangunan Air, Stabilitas
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The construction of the Salamdarma Siphon in Indramayu Regency is part of an irrigation system revitalization project aimed at addressing water supply deficits for agriculture, particularly in the Cipunagara River basin. To ensure smooth construction of the main structure, a diversion structure in the form of a cofferdam is required to redirect river flow and create a dry working area. This final project aims to design a stable cofferdam that is safe against soil and water pressures while being able to pass the design flood discharge without overtopping risks. The methodology includes hydrological analysis to determine the design flood discharge using the Log Pearson Type III probability distribution and the Nakayasu synthetic unit hydrograph. Structural stability evaluation is carried out through lateral earth and water pressure analysis, moment equilibrium calculations, and verification of strut buckling resistance according to technical standards. Seepage analysis is conducted manually and with the aid of software. The results show that the design peak discharge for a 10-year return period is 562.48 m³/s with a baseflow of 4.15 m³/s, and the design water level is at elevation +21.02 m after narrowing the Cipunagara River to 29.62 m due to the cofferdam width of 30.3 m. The cofferdam crest elevation is planned at +22.00 m with a freeboard of 0.98 m. The initial pile driving depth of 2.77 m is increased by a safety factor of 1.3, resulting in a final design depth of 3.6 m. The cofferdam structure is designed using NS-SP-IVW 600.200.18 sheet pile profiles with a three-layer strutting system spaced 2 m vertically and 4 m horizontally. Buckling verification results show that the WF 400.200.8.13 profile is capable of withstanding lateral loads and meets stability requirements. Keywords: Cofferdam, Sheet Pile, Strutting, Water Building Construction, Stability

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Cofferdam, Steel Sheet Pile, Strutting, Konstruksi Bangunan Air, Stabilitas, Cofferdam, Sheet Pile, Strutting, Water Building Construction, Stability
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA656.2 Buckling T Technology > TA Engineering (General). Civil engineering (General) > TA760+ Retaining walls T Technology > TC Hydraulic engineering. Ocean engineering > TC530 Flood control
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Muhammad Zakariyya
Date Deposited:	04 Aug 2025 09:03
Last Modified:	04 Aug 2025 09:03
URI:	http://repository.its.ac.id/id/eprint/126835

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