PERENCANAAN STRUKTUR BAWAH (ABUTMENT) PADA PEMBANGUNAN JEMBATAN PETAK, KABUPATEN NGANJUK

Studi Kasus : Pembangunan Jembatan Petak, Kabupaten Nganjuk

Abstract

Borepile foundation is a type of deep foundation, which has several advantages compared to pile foundation. The advantage of the borepile foundation is that it does not provide ground vibrations, can penetrate rocks, and does not cause land level rise, considering that the area around the bridge is a densely populated settlement. With the existing steep river conditions, a strong abutment planning is also required to withstand the soil pressure behind the abutment. This planning aims to determine the dimensions and amount of reinforcement in the abutment and borepile foundation according to the needs. The structural loads of the bridge that work on the abutment refer to SNI-1725-2016 and SNI-2833-2016. The method used to calculate the bearing capacity of the bored pile foundation is the Mayerhoff method. From the planning results, the dimensions of the abutment are 6.5 m high, 6 m wide, and 12 m long. From the calculation results, the basic reinforcement of the abutment body is D29 - 100 with dividing reinforcement D19 - 200 and shear reinforcement D13 - 400. Whereas the x direction pilecap reinforcement is installed with D25 - 125 and the y direction reinforcement D25 - 165 with dividing reinforcement D16 - 200. used is the bored pile foundation D = 80 cm with a depth of 14 m. For the bearing capacity of a single pile foundation Qa = 3896.25 kN while the bearing capacity of the pile group of Qpg = 39411.556 kN. The reinforcement used for the foundation is 14 D22 with spiral reinforcement D12-80. The result of a single pile settlement is 7.14 cm> 8 cm. It can be concluded that the abutment design and bored pile foundation can be used in the construction of the Petak Bridge, Nganjuk Regency.