METODE PELAKSANAAN TRUSS DENGAN BENTANG 198,32 METER PADA PROYEK PEMBANGUNAN DOME COAL YARD PLTU 2 JAWA TENGAH ADIPALA, CILACAP

PUTRI AYU MENTARI, Agus Kurniawan, ST., MT., Ph.D

2021 | Tugas Akhir | D3 TEKNIK SIPIL

Dome coal yard merupakan struktur truss atap baja yang berbentuk lengkung dengan bentang 198,32 m dan berfungsi sebagai atap pengganti untuk melindungi persediaan batu bara yang berada di PLTU Adipala, dikarenakan atap eksisting sebelumnya belum melingkupi seluruh area coal yard. Proses pelaksanaan struktur truss baja tersebut melewati tahap fabrikasi dan tahap erection yang membutuhkan tingkat kehati�¢ï¿½ï¿½hatian tinggi, sehingga diperlukan metode pelaksanaan pembangunan yang tepat. Penelitian bertujuan untuk menganalisis metode pelaksanaan truss bentang panjang pada proyek pembangunan dome coal yard PLTU 2 Jawa Tengah Adipala, Cilacap serta evaluasi dalam pelaksanaannya. Data yang digunakan berasal dari data sekunder yang diberikan secara daring serta hasil dari wawancara yang dilakukan dengan pengawas proyek. Hasil penelitian berupa metode pelaksanaan fabrikasi yang meliputi kegiatan pembacaan shop drawing, perakitan, pengelasan, coating ulang dengan hot dip, serta inspeksi fabrikasi. Metode pelaksanaan lainnya yaitu kegiatan erection yang meliputi proses pengangkatan dan perakitan serta tahap inspeksi. Evaluasi terhadap pelaksanaan dome coal yard terdapat ketidaksesuaian diantaranya overdimension sehingga pelaksanaan fabrikasi perlu dilakukan dilapangan, kesalahan pembacaan shop drawing sehingga diperlukan pergantian plat gusset menjadi plat stiffener, adanya perbedaan standar flange sehingga perlu dilakukan analisis ulang, area erection berada di coal yard mengharuskan operasional PLTU harus tetap bekerja 24 jam sehingga diperlukan komunikasi yang intensif dengan pihak coal handling, serta kurang presisinya proses fit up sehingga perlu dilakukan penambahan plat dalam waktu pemasangannya.

The dome coal yard is a structure of curved-steel roof truss with 198.32 m long-span and used as a replacement roof to protect the coal supply at the Adipala PLTU because the existing roof did not cover the entire coal yard area. The implemented process of the steel truss structure goes through the fabrication and the erection stage which requires a high level of care so that the appropriate construction implementation method is needed. The aims of this final project written is to analyze the implementation method of the long-span truss at the dome coal yard construction project of PLTU 2 Central Java, Adipala, Cilacap, and evaluate its execution. The data source was from secondary data given by online platforms and the results of interviews with project supervisors. The results of this final project are the implementation method of the fabrication, which includes reading shop drawings, assembling, welding, re-coating with hot dip, and fabrication inspections. Another implementation method is erection activities which include the lifting and assembly process until the inspection stage. Evaluation of the coal yard dome implementation has incompatibilities. The incompatibilities such as over-dimension so that the implementation of fabrication needs to be done in the field, there is also shop drawing, reading errors so that it is necessary to change the gusset plate to be a stiffener plate, there are many differences in flange standard so that it needs to be re-analyzed, the erection area in the coal yard requires the operation of the PLTU to keep working for 24 hours so that intensive communication with coal handling is needed, and the lack of precision in the fit-up process so it is necessary to add plates during installation.

Kata Kunci : Dome Coal Yard, Construction Method, Fabrication, Erection, Evaluation