THE DESIGN OF PADALARANG FLYOVER FOR TRANSPORT SYSTEM

• Main Author: Hartanto, Fitra
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/72155
• Institution: Institut Teknologi Bandung

Padalarang Intersection is an intersection that brings together traffic flows from 4 directions, namely Bandung National Road, Cianjur, Purbaleunyi Toll Access, and Kota Baru Parahyangan (KBP) Access Road. In addition, there are also traffic flows to and from Purwakarta City on the north side near Padalarang Intersection. This causes many traffic conflict points that occur in the intersection area. Seeing this, traffic engineering has been carried out in the form of setting right turns from all directions to be eliminated and not through the intersection. From this engineering, an analysis of the existing intersection is carried out to obtain intersection performance in the form of degree of saturation, queue length, delay, and LoS. The results of the existing intersection analysis show poor performance. This is characterized by an average intersection delay of 35.431 sec/pcu with LoS level D. For this reason, several traffic management recommendations are made to improve the performance of the existing intersection. The recommendations made are a forecast analysis of the existing intersection performance, scenario 1 in the form of widening the approach, and scenario 2 in the form of flyover construction. This analysis is carried out in a 5-year period, namely 2021 - 2025. Of the 3 recommendations, it was found that the best performance resulted from the performance of scenario 2 in the form of flyover construction with performance results in 2025, namely the degree of saturation of 0.824, average delay of 13.650 sec/pcu, and LoS B. To realize the construction of the Padalarang Flyover, it is necessary to carry out a good and detailed design process. From the results of the road geometric design, the Padalarang Flyover consists of 195,262 m elevated span segments and 106,707 m abutments so that the total length of the flyover is 301,969 m. For the elevated span, this segment consists of 6 spans and 5 pillars with a distance of 30, 30, 30, 35, 30, and 30 m between each pillar. As for abutments, this segment consists of abutment 1 (A1) with a length of 75.128 m and abutment 2 (A2) with a length of 31.579 m. In addition, a 4/2 D type road with a planned speed of 40 km/h is also generated. Horizontal bends were designed as 2 PI with SCS type. Vertical bends were designed as 5 PVI, consisting of 3 convex vertical curves and 2 concave vertical curves. In the pavement design, the type of pavement used for the elevated non-span segment is flexible pavement with AC-WC 50 mm, AC-BC 60 mm, AC-Base 220 mm, CTB 150 mm, and Class A 150 mm Aggregate Foundation. As for the elevated span segment, flexible pavement was used following the surface layer on the elevated non-span segment with AC-WC 50 mm and AC-BC 60 mm thick. In addition, the capacity of the pavement against fatigue cracking and permanent deformation (rutting) was also checked. From these checks, the percentage value of CESA5 load to fatigue capacity is 57.749% and the percentage value of CESA5 load to rutting capacity is 43.625%. In the design of road facilities, road markings are used in the form of longitudinal markings (whole lines and dotted lines) as traffic lane dividers and vigilance markings with shock effects in the form of rumble strips as road safety in reducing speed. In addition, road signs were also designed consisting of 6 warning signs, 9 prohibition signs, 1 command sign, and 3 guidance signs. Warning signs are useful for providing warnings of bends and obstacle objects. Prohibition signs are useful for providing information on the prohibition of entering certain vehicles, speed limits, stopping, turning right, and parking. Finally, guide signs are useful for providing information on traffic arrangements and predecessors to the direction you want to go. In the construction management design, the work reviewed on the Padalarang Flyover project in the field of Transportation Engineering includes subgrade preparation work, aggregate foundations, CTB, flexible pavement, concrete barriers, road markings, and road signs. The estimated construction cost required for the Transportation Engineering work item is Rp 12,715,031,430.33 with a work duration of 41 days (± 2 months).