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Irfanto, Ryobi
Universitas Kristen Krida Wacana
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Analysis of the Cinapel Bridge’s Construction Operations using Simulation Abduh, Muhamad; Halvireski, Siska; Delfani, Catherine; Irfanto, Ryobi; Wirahadikusumah, Reini D.
IPTEK Journal of Proceedings Series No 6 (2017): The 3rd International Conference on Civil Engineering Research (ICCER) 2017
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23546026.y2017i6.3259

Abstract

Simulation has been well known as an effective technique that enables planning and analysis of a construction operation to be performed in advance anticipating problems of efficiencies that would occur in the implementation phase. Therefore, simulation technique could be used to design resources associated with a construction operation to be optimal and to analyze an ongoing operation to be evaluated and refined. This paper discusses the use of simulation to analyze several construction operations, i.e., bored piles, pile caps, piers, and girders, that will be used in building the Cinapel’s Bridge at the Cisumdawu Toll Road Project. The simulation using WebCYCLONE was utilized to determine the most optimal resources needed in each construction operation; resources needed to gain the highest productivity and the lowest wastes. Data of each operation for simulation were gathered from the field, as well as opinions from the practitioners related to the project. The results of the simulation are presented and recommendations are made for the contractor to refine the on-going construction operations as well as to design construction operations before the implementation in the fields.
Penerapan Konsep Just in Time pada Proyek Renovasi Gedung CITIE/CIBE/CADL ITB Anita Ariesty; Muhammad Rusdian La Ola; Ryobi Irfanto
JTERA (Jurnal Teknologi Rekayasa) Vol 3, No 1: June 2018
Publisher : Politeknik Sukabumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31544/jtera.v3.i1.2018.129-136

Abstract

Sistem manajemen mutu penting untuk diterapkan pada proyek konstruksi mengingat bahwa hal ini terkait dengan kepuasan stakeholders. Pengelolaan mutu dapat dijalankan melalui Total Quality Management (TQM) yang mencakup segala aspek kegiatan kontraktor yang harus dikelola dengan benar agar mutu hasil pekerjaan dapat memuaskan stakeholders. Pada TQM, terdapat konsep Just in Time (JIT) yang merupakan keseluruhan filosofi dalam operasi manajemen dimana segenap sumber daya dibutuhkan dengan tujuan untuk meningkatkan produktivitas dan mengurangi pemborosan. JIT adalah konsep dengan sasaran utama untuk menghasilkan produk tertentu yang diperlukan dalam jumlah yang dibutuhkan pada saat yang tepat. Makalah ini akan membahas mengenai penerapan JIT pada proyek renovasi beberapa gedung di lingkungan Kampus Institut Teknologi Bandung (ITB). Desain yang diberikan untuk proyek adalah sistem JIT dimana kontraktor dan supplier terlebih dahulu dijadwalkan tentang pengiriman materialnya dan perkiraan produktivitas pekerjaannya. Dari hasil penelitian didapatkan bahwa untuk mengendalikan persediaan antisipasi dan fluktuasi, konsep JIT dapat menjalankan mekanisme persediaan yang mampu memenuhi keterbatasan dan kelangkaan persediaan. Konsep JIT  melibatkan seluruh aspek dan segenap sumber daya manusia yang ada sebagai satu kesatuan yang memiliki tanggung jawab bersama dalam meningkatkankan efisiensi dan produktivitas.
PEMBUATAN SALURAN DISTRIBUSI AIR BERSIH DI DESA WANGUNJAYA, CUGENANG Ryobi Irfanto; Hans Dermawan; Aswin O. Hasudungan; Jehuda Christofel Sriwijaya; Artha Wicaksana
Jurnal Abdimas Ilmiah Citra Bakti Vol. 5 No. 3 (2024)
Publisher : STKIP Citra Bakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38048/jailcb.v5i3.3639

Abstract

Air bersih merupakan salah satu kebutuhan penting dalam melangsungkan hidup. Pada beberapa daerah kebutuhan air bersih masih kurang terpenuhi sehingga mengganggu kehidupan para warganya. Pembuatan saluran distribusi air bersih menjadi solusi untuk permasalahan tersebut. Distribusi air dapat dilakukan secara kolektif dengan membuat penampungan sehingga kebutuhan air bersih tetap terjaga di berbagai musim. Pengabdian ini bertujuan untuk membuat saluran pipa distribusi air bersih lengkap dengan toren penampung dan toren filtrasi yang tersalur ke 5 rumah warga di RW 02 Desa Wangunjaya, Kecamatan Cugenang. Desa Wangunjaya, Kecamatan Cugenang merupakan salah satu wilayah yang terdampak akibat bencana gempa bumi yang terjadi pada bulan November 2022. Metode yang dilakukan adalah dengan melakukan survei lapangan untuk melihat kondisi lingkungan, selanjutnya membuat dokumen kerja lapangan dan pelaksanaan, serta dokumentasi dan survei kepuasan masyarakat. Hasil pengabdian didapatkan sumber air yang memiliki debit 432 liter/jam dan debit air bersih setelah filtrasi dan ditampung sebesar 270 liter/jam. Hal ini memenuhi perkiraan kebutuhan air bersih 5 rumah warga yang menjadi sasaran sebesar 120 liter/jam. Survei kepuasan juga menunjukkan bahwa masyarakat penerima bantuan di RW 02 Desa Wangunjaya, Kecamatan Cugenang puas akan hasil kinerja pengabdian masyakarat dan berharap dapat dilanjutkan untuk daerah lainnya.
APPLICATION OF VALUE ENGINEERING IN ARCHITECTURAL WORK ON THE LAHAIROI LATERI CHURCH, AMBON CITY Irfanto, Ryobi
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 13 No. 2 (2024): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v13i2.44019

Abstract

Effective construction cost control such as saving construction costs will increase the chances of project success and user satisfaction. The biggest component in construction costs is material. High material costs necessitate a review of building functions. Construction savings are made by reviewing the largest cost components in architectural work. Review of material components is carried out using the value engineering method. Value engineering is a method for getting an alternative picture so that the costs incurred are more efficient than the initial planning costs. The application of value engineering to construction projects has a major impact on planning by generating reviews to obtain cost effectiveness. Research was conducted at the Lahairoi Lateri Church Building project located in Ambon City. The aim of this research is to find alternative material substitutes for architectural work and obtain total cost savings by using the concept of value engineering. The use of the value engineering concept is carried out by information phase, analyzing the function of using index function analysis techniques, identifying alternative materials, and evaluating the results of the alternative materials. Research using the value engineering concept on the Lahairoi Lateri Church Building Construction project, Ambon City achieved cost savings of 861,116,841.05 IDR. This amount saves 5.32% of the initial architectural work costs of 16,170,539,500 IDR. These results show that value engineering can eliminate unnecessary costs in church-type building without changing the building function.
ANALISIS PENYEBAB PEKERJAAN PERBAIKAN PENGECORAN PROYEK X DENGAN PARETO CHART Ryobi Irfanto
Jurnal Teknik Sipil Vol 18 No 1 (2022): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v18i1.4485

Abstract

Construction projects are inseparable from their unique management. The unique management of construction projects makes it difficult to maintain their quality. One of the tools to measure quality in project management is the Pareto chart. Pareto chart is a statistical technique that is usually used for decision making based on the frequency of events compared to the causes of events. This research was conducted to analyze the causes of repair work on project X by using Pareto chart. The conceptual framework used in this study is based on two approaches, namely literature and field observations. The main literature for analysis is the Pareto chart then field data collection on each component first which is then categorized based on the type of work. After the data is categorized, a Pareto chart will be made from the data. The processing results obtained two dominant types of errors in the casting work, namely cracks and unevenness of the casting results. Cracks and unevenness of the casting results can be overcome by the chipping method then followed by grouting if necessary. The chipping method is used to repair porous concrete or flatten the casting if it swells, and the grouting method to fill cracks and chipping results with a mixture of cement and water until the surface becomes flat and the casting work results are better.
Penerapan Konsep Value Engineering pada Proyek Bangunan Gedung Sekolah : (Studi Kasus: Madrasah Ibtidaiyah Negeri 3 Gunungsitoli) Ryobi Irfanto; Iwan Saputra N W; Hans Dermawan
Jurnal Teknik Sipil Vol 19 No 1 (2023): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v19i1.5254

Abstract

The cost aspects of construction projects are very diverse, such as overbudget, overtime, etc. which are grouped as unnecessary costs. The concept of value engineering can optimize the unnecessary costs. Value engineering is a technique for analyzing job functions or processes to determine "best value", or the best relationship between value and cost. This study aims to apply value engineering to a school building project with a case study of Madrasah Ibtidaiyah Negeri 3 Gunungsitoli. Value engineering consist of the preparation stage, the function analysis stage, the creative stage, the evaluation stage, and the recommendation stage. The preparation stage uses the Pareto principle to find out the work of great value to be carried out. The function analysis stage is used to sort out the main and supporting materials, and calculate the cost/worth of the work. The creative stage is finding alternative materials that can replace without changing the function. The evaluation stage is carried out to calculate the latest value of each alternative material. Finally, the recommendation stage is to recommend alternative materials with the lowest costs. The need of data is the Budget Plan (RAB), Unit Price Analysis (AHS), and material data from planners who apply the value engineering. The result of budget planed efficiency is IDR244.531.582 which is 3.76% lower than total initial project’s budget.
PERBANDINGAN DURASI PEKERJAAN BOR KERING DAN BOR BASAH PADA PEKERJAAN TIANG BOR DI PROYEK X Florencio, Ricardo; Irfanto, Ryobi; Wijaya, Usman
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD) Vol 7 No 2 (2024): INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD)
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/10.25105/cesd.v7i2.21678

Abstract

The duration of construction work is a crucial factor that affects the efficiency and success of a project, especially in bored pile construction. The purpose of this study is to identify the differences in the duration of dry and wet drilling work along with internal and external factors that affect the duration. Dry drilling is a drilling condition without using fluid, while wet drilling is a drilling condition using polymers or fluids to maintain the soil wall so that it does not collapse. The study was conducted through unstructured interviews and field observations by finding 40 data on project X. Data processing in this study was carried out using a comparative method and presented in the form of tables and graphs. Based on this comparison, it can be seen which work is more efficient and faster and the factors that influence it. Based on data analysis, the dry drilling method is more efficient with a total working duration of 3.26 hours compared to 6.37 hours required for wet drilling. The biggest difference is in the drilling and cleaning time which is different by 2.52 hours. In addition, factors such as tool damage, bad weather, and technical difficulties can affect the duration of work, especially when using wet drilling. This study provides important information for choosing the right drilling method to reduce working time and increase project efficiency
Analisis Tingkat Kebutuhan Pekerja Level Menengah Proyek Konstruksi (Studi Kasus: 3 Proyek Gedung di Jakarta Barat) Irfanto, Ryobi; Salim, Felicia Devita
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 1 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i1.16135

Abstract

The motivation of the workers influences the results of project work. The cause can be identified by knowing the level of needs of the workers. One way to find out the level of needs of workers is with Abraham Maslow's theory of needs. Abraham Maslow's ranking of needs consists of 5 levels of basic human needs, sequentially from the lowest level, namely physiological needs, safety, love and affection, esteem, and self-actualization. This study aims to analyze the level of needs for mid-level construction workers at Building Project in West Jakarta which affects the motivation of construction project workers. The research method used is a questionnaire to middle-level workers from three project. Data processing and literature analysis were carried out when the questionnaire indicators based on the literature were obtained on the 5 needs ratings. The results obtained from the questionnaire are that the most influential need factors for middle-level workers are support from family to workers, bonuses, good health programs, relations between co-workers, and overtime pay increased. By improving communication on the factors of need for support from family and good relations between co-workers, rewards on the factors of bonuses and overtime pay, last is guarantees a good health program on the factors of the work environment
IDENTIFICATION OF PRODUCTIVITY VALUES USING THE METHOD PRODUCTIVITY DELAY MODEL ON WALLER BEAM WORK Yeremia, Melvin; Irfanto, Ryobi
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 2 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i2.53988

Abstract

Productivity can be interpreted as a comparison between physical output and real output with the actual input. This research aims to identify labor productivity on waller beam installation work in construction projects using the Method Productivity Delay Model (MPDM). The research method is carried out by conducting direct observations in the field and collecting productivity data using MPDM which is applied through delay analysis in the production cycle, techniques for evaluating work team balance and ensuring optimal labor allocation. The results showed that several factors, such as the environment contributing to the waller beam installation contributed 0.04, equipment factor contributed 0.21, labor factor contributed 0.36, material factor contributed 0.15, and management by 0.02 contributed to the delay and lower productivity. Ideal productivity was obtained at 1.737 units/s, overall productivity at 1.486 units/s, and % Achieved Productivity based on Ideal Productivity at 85.54%. In addition, the findings also emphasize the importance of proactive planning and real-time monitoring to reduce productivity losses and improve construction project performance.
IMPLEMENTATION VALUE ENGINEERING FOR ARCHITECTURAL COST IN 6X10 AND 6X12 HOUSING RESIDENTIAL AREA (CASE STUDY: RESIDENTIAL AREA IN BINTARO JAYA) Irfanto, Ryobi; Chiandy
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD) Vol 8 No 1 (2025): INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD)
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/cesd.v8i1.23797

Abstract

The issue of limited land in DKI Jakarta has resulted in a decrease in residential development, making it difficult for many residents to obtain proper housing. As one of the supporting cities of the capital, South Tangerang is favored by private developers for residential area development, particularly in the Bintaro Jaya area. The research is conducted on a housing project by PT. C, a private developer in Indonesia, focusing on houses with the highest number of units built, specifically type 6×10 and 6×12 houses. Value engineering needs to be carried out to achieve cost efficiency to determine the amount and percentage of cost savings. The research focuses only on architectural work because in housing project architectural works have a larger cost. The process begins with the information phase using a work breakdown structure, cost breakdown, and Pareto chart, followed by a function analysis phase using a function analysis index, a creative phase to find alternative materials, then an evaluation process, and finally presenting the results in the presentation phase. The research results for type 6×10 houses show savings of IDR 36,144,550.85 with a percentage of 10.68%, while type 6×12 houses show savings of IDR 41,508,819.29 with a percentage of 8.25%.  The difference in percentage is due to the variation in work volume. The larger the work volume, the smaller the percentage of savings
Co-Authors Abduh, Muhamad Anita Ariesty Artha Wicaksana Aswin O. Hasudungan Charolin, Eva Chiandy Delfani, Catherine Dermawan Dermawan Florencio, Ricardo Halvireski, Siska Hans Dermawan Iwan Saputra N W Jehuda Christofel Sriwijaya Lidyawati, Rut Manulye, Ian Hendrata Muhammad Rusdian La Ola Reini D. Wirahadikusumah, Reini D. Salim, Felicia Devita Yeremia, Melvin