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All Journal Sprocket : Journal of Mechanical Engineering Jurnal Darma Agung
Saragi, Yetty
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PRODUKTIVITAS PEKERJA PROYEK KONSTRUKSI DAN FAKTOR YANG MEMPENGARUHI Lumbangaol, Partahi; Saragi, Yetty; Purba, Luki Hariando
JURNAL DARMA AGUNG Vol 32 No 4 (2024): AGUSTUS
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Darma Agung (LPPM_UDA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46930/ojsuda.v32i4.4620

Abstract

Produktivitas merupakan aspek penting dalam keberhasilan suatu proyek konstruksi. Produktivitas yang baik menghasilkan kualitas yang lebih tinggi, waktu yang lebih cepat, biaya yang lebih rendah, dan hasil yang lebih baik secara keseluruhan. Penelitian ini bertujuan untuk mengetahui : (1) besar produktivitas tenaga kerja yang diukur dalam Faktour Utilitas Tenaga Kerja (LUR = labour utility rate), (2) menentukan pengaruh variabel umur, pengalaman kerja, tingkat pendidikan, kesesuaian upah, jumlah tanggungan keluarga, kesehatan pekerja, hubungan antar pekerja, manajerial dan komposisi kelompok kerja, dan (3) mengetahui variable paling dominan yang berpengaruh pada kegiatan konstruksi. Penelitian dilakukan di proyek pembangunan Jembatan Tano Ponggol, Kabupaten Samosir. Metodologi yang digunakan survey kuesioner dan pengamatan terhadap aktifitas 50 orang pekerja pada saat pembangunan salah satu tiang kolom jembatan. Hasil pengamatan mendapatkan rerata LUR 89,35% dengan LUR maksimum yang terukur 92,7%. Keseluruhan variabel yang diamati yaitu umur, pengalaman kerja, tingkat pendidikan, kesesuaian upah, jumlah tanggungan keluarga, kesehatan pekerja, hubungan antar pekerja, manajerial dan komposisi kelompok kerja memiliki pengaruh signifikan terhadap produktifitas pekerja proyek konstruksi dimana variabel “hubungan antar pekerja” menjadi yang paling dominan mempenaruhi produktifitas pekerja pada proyek ini.
Korelasi Nilai Hambatan Konus Terhadap Parameter Rembesan Dalam Aplikasinya Pada Dinding Penahan Tanah Saragi, Yetty; Bernandus, Riski; Sidabutar, Ros Anita
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 2 (2023): Edisi Februari 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v4i2.916

Abstract

Retaining walls are one of the constructions that are often found as slope safety walls which function to withstand lateral forces from the soil behind them. Retaining walls must be able to withstand shear, overturn, bearing capacity and meet the provisions of SNI 8460 2017 Geotechnical Design Requirements. The retaining wall must also be able to withstand water seepage into the soil behind it so it is necessary to know the amount of the seepage coefficient (k). The value of the seepage coefficient (k) can be determined from the Constant Head and Falling Head laboratory tests as well as by using the correlation from the results of the CPT Cone Penetration Test (which was used in this study). The CPT test was carried out at 4 stations that had experienced slope failure. Furthermore, this study designed a retaining wall in the landslide area by taking into account the magnitude of the seepage coefficient (k). From the four CPT points, the seepage coefficient values were obtained k1 = 1.06E-05 cm/sec, k2 = 5.79E-06 cm/sec, k3 = 6.77E-06 cm/sec and k4 = 6.46E-06 cm/sec. Taking into account the presence of water seepage behind the retaining wall, it is obtained that FK 1.65 still does not meet FK under conditions of high levels of uncertainty and large repair costs (FK requirements > 2.0 according to SNI 8460 2017). From this study, it was found that by calculating the seepage coefficient (k), the FK value was not sufficient and it was suggested that in its implementation, efforts to compact the soil layer by layer behind the wall were needed so that the soil behind the wall was quite dense.
Korelasi Hambatan Konus Dengan California Bearing Ratio Lapangan Pada Tanah Lempung Sidabutar, Ros Anita; Saragi, Yetty; Situmorang, Jesika
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 2 (2023): Edisi Februari 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v4i2.917

Abstract

The bearing capacity of subgrade for pavement thickness planning needs is generally determined by carrying out CBR testing. The BCR test in this study will be carried out by field CBR tests (field CBR) using the results of the DCPT examination. Inspection with the DCPT tool produces soil bearing strength data to a depth of 90 cm below the subgrade. The results of this examination are expressed by the Penetrometer Scale Penetrability (SPP) and the Penetration Resistance Scale (SPR). Road construction, which is certain to continue, requires data on identification of soil types and CBR where such data is not always available. In fact, the correlation between CBR and conical tip resistance (qc) already exists. Rahardjo (1996) suggests that for clay, the correlation between qc and CBR is CBR = 0.5 qc. However, the correlation results come from an unknown area, which of course the soil structure and properties are likely to be different and therefore it is also common to find that the time available to design a road pavement layer foundation is very urgent. Meanwhile, to obtain more accurate design results, Qc and CBR data are needed. To provide this connection using Cone Penetration Test (CPT) data at 4 stations and using correlation from the initial soil state data, soil stratigraphy is needed from the segment that will receive the construction. In this study, the CBR value correlation from Rahardjo (1996) and the Novo SPT application was used to obtain the CBR value and then describe the stratigraphy of the soil in that segment. From the results of the CPT to the correlation and Novo SPT, the CBR value to a depth of 2.0 m has not reached 6%, meaning that in this segment, if road construction is to be carried out, it requires soil improvement to obtain a CBR of at least 6%.
Review Kapasitas Daya Dukung Dan Tinjauan Waktu Pelaksanaan Bore Pile Pada Pembangunan Jembatan Jalan Bebas Hambatan Binjai Pangkalan Brandan Saragi, Yetty; Pasaribu, Humisar; Saragi, Tiurma; Simanjuntak, Johan Oberlyn; Hutagalung, Bartholomeus; Simanjuntak, Salomo
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 5 No 1 (2023): Edisi Agustus 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v5i1.1225

Abstract

In the Sei Wampu Bridge work project, Binjai Pangkalan Brandan carried out bore pile foundation installation work at the A2 foundation point with a total of 21 piles. Review of the bearing capacity of bore pile foundations using Analysis from Meyerhof (1956) and the Converse-Labarre Formula method for the calculation of pile group efficiency. The time of completion of work based on the time schedule plan is 125 calendar days. This research conducted a review using the Critical Chain Project Management (CCPM) method to obtain time efficiency, so that the project can be carried out on time. From the results of analysis and discussion, it was obtained that the largest foundation carrying capacity was the result of laboratory data using method C. Significant differences in results were obtained, especially laboratory data due to the correlation value used in each method. The result of calculating the bearing capacity of the foundation based on the method of Luciano Decourt (1987) using N-SPT data is 287,600.76 kN; Meyerhof's (1956) method using N-SPT data is 265,062.68 kN; a combination of Meyerhof's method (1976), Vesic's method (1977); the combination of the Vesic method (1977), the Coyle and Castello method (1981) and the results of foundation carrying capacity analysis using the All Pile program is 41,159.85 kN. The Critical Chain Project Management method is defined as the longest chain of interrelated events, where the linkage lies in the work or resources that are interconnected with each other, by cutting 50% of the duration of the work and replacing it as a buffer. The time comparison obtained from the calculation results using the CCPM method obtained a time efficiency of 116 days with a work time difference of 7.2% or about 9 days from the existing duration of the previous 125 days, while to compare the results of the CCPM method, calculations were carried out based on realization for 97 days, where the realization results were smaller than using the CCPM method and time schedule plan. Keywords : Bore pile, Carrying capacity, Time review
Co-Authors Bernandus, Riski Hutagalung, Bartholomeus Lumbangaol, Partahi Pasaribu, Humisar Purba, Luki Hariando Saragi, Tiurma Sidabutar, Ros Anita Simanjuntak, Johan Oberlyn Simanjuntak, Salomo Situmorang, Jesika