Ali, Mohammad Ali Mukoddas (2025) Perencanaan Bangunan Pengelak Pada Bendungan Jragung, Kabupaten Semarang, Jawa Tengah. Diploma thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Bendungan Jragung berada di Desa Candirejo Kecamatan Pringapus Kabupaten Semarang, dimanamerupakan bendungan dengan tipe urugan zona inti tegak dengan elevasi puncak +119,5m yang akan dibangun di sisi hulu Sungai Jragung yang merupakan induk dari 2 anak sungai yaitu Kali Meranak dan Kali Trimo, kecamatan pringapus, kabupaten semarang, jawa Tengah. Dalam Pembangunan bendungan jragug ini dibangunlah bangunan pengelak, Dimana pada bendungan jragung sendri terdapat beberapa bangunana pengelak antara lain, terowongan pengelak, cover dam, dan saluran pengelak, Dimana bangunan tersebut bertujuan untuk mengelakkan aliran yang mengarah kepada konstruksi utama bendungan selama konstruksi berlangsung.tujuan dari tugas akhir ini adalah untuk perencanaan ulang bangunan pengelak pada bendungan jragung kabupaten semarang, jawa Tengah.Pada penelitian ini, akan dilakukan perencanaan dimensi terowongan pengelak serta cofferdam pada bendungan jragung yang perlu dilakukan adalah menentukan diameter dan bentuk terowongan pengelak dan cofferdam berdasarkan hasil dari penelusuran banjir dengan debit kala ulang 25 tahun yaitu sebesar 346,37 m3/detik Dari hasil perencanaan didapatkan terowongan pengelak dengan penampang 2r horseshoe dengan dimensi D = 5.2 m dengan dengan hasil flood routing elevasi max air ada di elevasi +73,97. Serta untuk dimensi cofferdam berdasarkan hasil flood routing didapatkan dimensi cofferdam dengan ketinggian 9 m, dengan lebar puncak 4,5 m dan kemiringan 1:1.75 dan tinggi maksimumair di depan cofferdam m. untuk dimensi saluran pengelak approach channel penampang trapezoid dengan B = 8 m dengan kemiringan saluran 1:1.75 dan ketinggian maksimum air pada saluran 4,69 m.
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Jragung Dam is located in Candirejo Village, Pringapus District, Semarang Regency, which is a dam with a vertical core zone embankment type with a peak elevation of +119.5m which will be built on the upstream side of the Jragung River which is the parent of 2 tributaries, namely the Meranak River and the Trimo River, Pringapus District, Semarang Regency, Central Java. In the construction of this Jragung dam, a diversion building was built, where in the Jragung dam itself there are several diversion buildings including, diversion tunnels, cover dams, and diversion channels, where the building aims to divert the flow that leads to the main construction of the dam during construction. The purpose of this final project is to re-plan the diversion building on the Jragung dam in Semarang Regency, Central Java. In this research, the planning of the dimensions of the diversion tunnel and cofferdam on the Jragung dam will be carried out. What needs to be done is to determine the diameter and shape of the diversion tunnel and cofferdam based on the results of flood tracking with a 25- year return period discharge of 346.37 m3/second. From the planning results, a diversion tunnel with a 2r horseshoe cross-section with dimensions D = 5.2 m was obtained with the results of flood routing, the maximum water elevation was at an elevation of +73.97. As for the cofferdam dimensions based on the flood routing results, the cofferdam dimensions were obtained with a height of 9 m, with a peak width of 4.5 m and a slope of 1:1.75 and a maximum water height in front of the cofferdam m. for the dimensions of the diversion channel, the approach channel had a trapezoidal cross-section with B = 8 m with a channel slope of 1:1.75 and a maximum water height in the channel of 4.69 m
| Item Type: | Thesis (Diploma) |
|---|---|
| Uncontrolled Keywords: | Bendungan jragung, terowongan pengelak, coffer dam, saluran pengelak |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs |
| Divisions: | Faculty of Vocational > Civil Infrastructure Engineering (D4) |
| Depositing User: | Mohammad Ali Mukoddas |
| Date Deposited: | 06 Aug 2025 01:41 |
| Last Modified: | 06 Aug 2025 01:41 |
| URI: | http://repository.its.ac.id/id/eprint/127146 |
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