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Analysis of The Relationship of Rework and Inventory to Waste in The Ciputra Hospital Surabaya Project Ferdiandika, Ahmad Fadhil; Nuciferani, Felicia Tria; Choiriyah, Siti; Harianto, Feri
Jurnal IPTEK Vol 28, No 2 (2024): December
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2024.v28i2.5924

Abstract

Currently, the construction sector is adopting the theory of production in the manufacturing industry, known as lean construction, to reduce waste and increase value. Last Planner System (LPS) has not been widely used and has good potential because the advantage of LPS is to identify a job along with obstacles to improve performance in a construction project. In the construction of Junior High School (SMP) Al-Falah, it has work obstacles due to erratic weather so that the project is delayed, the author conducts a field survey to analyze the actual progress in the field, LPS has work indicators / work flow to measure the extent to which work indicators can be realized properly, the LPS work flow are Master Plan, Phase Pull Planning, Lookahead Planning, Constraints Analysis, Shielding Production, and Percent Plan Complete (PPC) as a standard for measuring whether project productivity is realized properly or not. In this study, the results of the implementation using LPS on the Al-Falah Junior High School construction project show that the lowest PPC can be seen in week 7, which is 0% because there is no work achievement so that the work is delayed, while in week 16 it can be seen that PPC has increased dramatically to 96%. Then after averaging the PPC of 51% which means that LPS has not been able to increase the reliability of planning above 70%, (Ballard, 2000).
Current Mapping on the UBS Surabaya Office Building Construction Project Nuciferani, Felicia Tria; Yudhatama, Putra Tri; Septiarsilia, Yanisfa; Putra, Kurnia Hadi
Journal of Civil Engineering, Planning and Design Vol 2, No 1 (2023): May
Publisher : Faculty of Civil Engeneering and Planning - ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jcepd.2023.v2i1.4561

Abstract

In the world of construction, waste is one of the factors that must be minimized or eliminated, because it can cause cost losses and time delays in the implementation of a construction project. Lean production concept approach using Value Stream Mapping (VSM) tools is a method that can be used to minimize waste that can be seen through value-added activities, non-value added but necessary. The scope of work that has a significant impact on the UBS Surabaya office building construction project consists of ironwork, concrete work, and formwork work on the superstructure, during the period from March to May 2021. In the scope of work identified Value Added amounting to 73 activities (61.34%), and Non-Value Added but Necessary totaling 26 activities (21.85%). There are several types of waste that occur during the implementation process,
Value Stream Mapping in MEP Work on the Pondok Tjandra Project – Surabaya Felicia Tria Nuciferani; Siti Choiriyah; Feri Harianto; Mila Kusuma Wardani; Siti Nuraini
Jurnal Teknologi dan Manajemen Vol 5, No 2 (2024): July
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jtm.2024.v5i2.5548

Abstract

During construction, waste often occurs, not only material waste, but waste can also occur in activities that do not provide added value. Waste can result in cost losses and time delays in implementing a construction project. Value Stream Mapping (VSM) is a method that can be used to minimize waste by classifying activities into value added, non value added but necessary, and non value added. Mechanical engineering work was identified in the Pondok Tjandra Sidoarjo project, namely value added as many as 69 activities (67.65%), and non value added s as many as 17 activities (16.67%), while non value added but necessary as many as 16 activities (15.69%). The largest percentage of Non Value Added (NVA) is in AC work, namely 23.53%. The activities that are classified as waste are the preparation of labor tools/equipment, work delays due to waiting for the dismantling of formwork left over from structural work, breaking down light brick walls for refrigerant pipe lines conduilt pipes, and activities for the process of breaking down light brick walls again.
Model Kurva Belajar Pemasangan U-Ditch pada Proyek Normalisasi Saluran Air di Kota Mojokerto Harianto, Feri; Permana, Andhika Agung; Nuciferani, Felicia Tria; Listyaningsih, Diah; Alrizal, Fahmi Firdaus
Prosiding SENASTITAN: Seminar Nasional Teknologi Industri Berkelanjutan Prosiding SENASTITAN Vol. 05 2025
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pemasangan U-Ditch dalam proyek normalisasi saluran air memengaruhi kelancaran pekerjaan lainnya, sehingga  produktivitas kerja berperan sangat penting di proyek konstruksi. Pekerjaan berulang memungkinkan peningkatan keterampilan pekerja, yang berdampak pada pengurangan durasi pemasangan dan efisiensi biaya. Kurva belajar untuk suatu pekerjaan yang berulang tergantung pengalaman kerja sebelumnya, teknologi, dan alat.  Selain itu, keterampilan manajemen waktu juga mempengaruhi pruduktivitas kerja. Produktivitas tenaga kerja mempunyai hubungan dengan kurva belajar, dengan mengetahui model kurva belajar maka dapat mengetahui besarnya waktu yang dibutuhkan untuk suatu pekerjaan. Model kurva belajar pemasangan U-Ditch di penelitian ini adalah model wright, model de jong, model regresi exponential average dan beberapa model regresi Eksponensial. Sampel yang digunakan dalam penelitian ini adalah data waktu pemasangan U-Ditch pada proyek normalisasi saluran air di Kota Mojokerto. Besarnya sampel yang digunakan 30 pengamatan waktu dari pengangkatan U-Ditch sampai pada penempatannya dalam waktu 1 hari. Hasil penelitian ini terdapat tiga model yang terbaik, yaitu  persamaan model wright yaitu tn=5,232 n-0,242, persamaan model de jong yaitu tn=5,233 (M+(1-M) n-0,242), persamaan model regresi eksponensial yaitu tn=5,233n-0,233, dengan koefisien determinasi R2=97,49% dan kesalahan relatif terkecil bernilai 0,916. Model kurva belajar ini berkontribusi kepada produktivitas pekerjaan pelaksanaan di proyek konstruksi dalam memprediksi waktu pelaksanaan pekerjaan.
Supply Chain Management Analysis on Plumbing Works Nuciferani, Felicia Tria; Aulady, Mohamad Ferdaus Noor; Wardani, Milla Kusuma; Ardiyanto, Nanang
Jurnal IPTEK Vol 25, No 2 (2021): December
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2021.v25i2.1011

Abstract

One of the methods of applying lean construction in the construction sector that shifts from traditional to lean, eliminating all activities that do not generate added value, is supply chain management. This research compares the supply chain in two projects to decide on added value projects. This stems from the efficiency of establishing a simple organizational structure and encouraging contractors to focus more on the dominant material work. Supply Chain is a systems approach to delivering products to end consumers by using information technology and coordinating with suppliers and manufacturers/producers. The supply chain comparison for the second project is more inclined to the project apartment because it has four patterns and does not have much organizational coordination. In the apartment project pattern, the main contractor focuses on the project's core and provides activities to support subcontractors, such as elevator work. MEP work on buildings is complex, especially in coordinating the procurement of equipment, materials, and human resources because it involves many people and organizations both from outside and in the implementation process. Supply chain management in the construction sector is an effort to improve performance. To be more effective and efficient in providing high competitiveness for other contractor companies. Supply chain management in the construction sector is an effort to improve performance. To be more effective and efficient in delivering high competitiveness for other contractor companies. Supply chain management in the construction sector is an effort to improve performance.
ANALISIS RISIKO DALAM SUPPLY CHAIN PROYEK KONSTRUKSI MENGGUNAKAN METODE HOUSE OF RISK Ambarsari, Aulia Dewi; Nuciferani, Felicia Tria; Choiriyah, Siti; Harianto, Feri; Permatasri, Devi Indah; Wardani, Mila Kusuma
Jurnal Teknik Sipil Giratory UPGRIS Vol 6, No 2: Desember 2025
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/giratory.v6i2.27918

Abstract

During the construction process of the Sidoarjo Funeral Home, issues related to material flow led to project delays and deviation from the planned schedule. Therefore, risk analysis and evaluation are crucial to address potential disruptions in the material flow. This study applies the House of Risk (HOR) method to identify, prioritize, and develop mitigation strategies for risks arising within the material flow process. The risk identification phase adopts the Supply Chain Operation Reference (SCOR) approach to determine risk events and their causes. Subsequently, calculations are conducted to prioritize risk agents and design appropriate mitigation strategies. The strategy formulation process begins by assessing the correlation between mitigation actions and risk agents, followed by the calculation of Total Effectiveness (TEk), Degree of Difficulty (Dk), and the Effectiveness to Difficulty Ratio (ETDk) to determine the ranking of mitigation priorities. The results of the study identify 19 risk events and 20 associated risk causes within the material flow. Eight mitigation strategies are proposed to address nine dominant risk causes, including: the development of Standard Operating Procedures (SOPs) as a communication system, adding security protection for materials, conducting punishment to related parties, creating an integrated system, coordinating and communicating with suppliers, making agreements with external parties, conducting training, and tightly selecting workers.
Model Kurva Belajar Pemasangan Box Culvert Saluran Drainase di Jalan Kertajaya Surabaya Fachtur Ilyas Pangestu; Feri Harianto; Felicia tria Nuciferani
Jurnal Teknik Sipil Vol 7, No 1 (2026)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jts.2026.v7i1.8868

Abstract

Perubahan tata guna lahan di jalan Kertajaya Surabaya mengakibatkan rendahnya daya serap air tanah, curah hujan yang tinggi, saluran drainase yang tidak mampu menampung air sehingga berdampak  meningkatnya risiko banjir saat musim hujan. Selain itu, ditambah adanya kemacetan lalu lintas kendaraan sehingga diperlukan pelebaran jalan, untuk itu perlu pemasangan box culvert dengan cepat. Untuk itu, dibutuhkan produktivitas pemasangan bov culvert yang tinggi dengan pendekatan berbagai model. Tujuan penelitian ini memperoleh pengembangan model produktivitas yang akurat dan penggunaan metode pengukuran yang efektif untuk strategi penting dalam upaya meningkatkan efisiensi dan efektivitas dalam pemasangan box culvert. Metode penelitian menggunakan pendekatan kurva belajar dengan model Wright, model Stanford B, model De Jong, model regresi eksponensial. Pengambilan data diperoleh dari pengamatan waktu pemasangan box culvert dari pengambilan box sampai terpasang. Hasil penelitian menunjukkan  bahwa bertambahnya siklus  pekerjaan yang berulang memberikan  waktu rerata komulatif semakin mengecil untuk berbagai model, hal ini, menunjukkan produktivitas untuk pekerjaan yang berulang semakin meningkat. Model terbaik pada penelitian ini adalah model regresi eksponensial y = 33,67137 x-0,01367, dengan keakuratan (R2) yaitu 99,74% dan hasil kesalahan rerata (KR) terendah sebesar -0,9836. 
Evaluasi Value Engineering Struktur dan Non Struktur pada Pekerjaan Hotel Reddoorz Jl. Woodland WL 10 No. 7 Citraland, Surabaya Iqbal Bagus Dwi Putra; Siti Choiriyah; Felicia Tria Nuciferani; Fahmi Firdaus Alrizal
Jurnal Teknik Sipil Vol 7, No 1 (2026)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jts.2026.v7i1.8859

Abstract

Proyek pembangunan kerap menghadapi kendala tingginya biaya konstruksi, terutama pada pekerjaan struktur dan arsitektur. Penelitian ini bertujuan untuk mengidentifikasi komponen pekerjaan yang berpotensi menimbulkan pemborosan biaya, menganalisis alternatif yang lebih efisien, serta memberikan rekomendasi solusi yang dapat meningkatkan nilai (value) proyek. Metode penelitian dilakukan menggunakan metode Value Engineering. Hasil penelitian menunjukkan bahwa beberapa komponen pekerjaan pada pasangan dinding dan plesteran memiliki peluang penghematan biaya yang signifikan melalui pemilihan material serta metode pelaksanaan yang lebih tepat. Alternatif yang direkomendasikan mampu menghasilkan selisih biaya antara Rp 1.188.927.015,46 pada desain awal dan Rp 633.813.750,19 pada desain hasil Value Engineering. Penghematan yang diperoleh mencapai Rp 555.113.265,27 atau sekitar 46,72% dari total biaya awal. Temuan ini membuktikan bahwa penerapan Value Engineering efektif dalam meningkatkan efisiensi biaya tanpa menurunkan fungsi bangunan.