Pada Tugas Akhir ini, proyek yang ditinjau ialah proyek pembangunan gedung Mall The Park Semarang yang berlokasi di Krobokan, Semarang. Pada proyek ini, fondasi yang digunakan yaitu fondasi square pile. Berdasarkan data tersebut, penulis tertarik melakukan perancangan ulang fondasi gedung tersebut menggunakan fondasi spun pile. Digunakannya fondasi jenis spun pile diharapkan mempermudah proses pelaksanaannya karena selain tidak terkendala oleh muka air tanah yang tinggi, fondasi jenis ini memiliki kekuatan & kualitas tinggi yang diperoleh dari proses spinning yang mengakibatkan homogenitas dan kepadatan beton sangat tinggi. Sehingga diharapkan mampu menembus lapisan keras seperti lensa. Selain itu, diharapkan dengan volume beton yang lebih kecil namun memiliki kapasitas tahanan yang sama dengan fondasi jenis lain yang memiliki bearing area yang sama. Untuk mendapatkan beban yang bekerja pada fondasi, penulis melakukan pemodelan struktur atas menggunakan software ETABS 2013. Perhitungan daya dukung berdasarkan hasil Standard Penetration Test (SPT) dengan metode Terzaghi & Peck, perhitungan efisiensi grup menurut Converse-Labarre. Perhitungan penurunan elastik mengacu pada penurunan ijin menurut SNI 8460:2017. Selain itu dilakukan analisis pergeseran kepala tiang, perhitungan tebal dan penulangan pile cap. Dari perhitungan yang dilakukan dengan fondasi spun pile diameter 600 mm kelas A1, didapat jumlah spun pile dalam satu grup pada titik A1 sebanyak 20 tiang sedangkan pada titik A2 sebanyak 6 tiang. Dimensi pile cap titik A1 yaitu 10200 mm × 8100 mm dengan penulangan arah x D25 – 125 mm dan arah y D25 – 100 mm. Sedangkan dimensi pile cap titik A2 yaitu 3900 mm × 6000 mm dengan penulangan arah x D25 – 125 mm dan arah y D25 – 125 mm.

The final project reviews the project of building construction of Mall The Park Semarang located in Krobokan, Semarang. This project uses a square pile foundation. Based on the data, the author is interested in redesigning the building foundation by using spun pile foundation. By using spun file foundation, it is expected to simplify the implementation process due to not being constrained by high groundwater level, this foundation has high strength and quality obtained from the spinning process which causes the homogeneity and high concrete density. Therefore, it is expected to be able to penetrate the hard layer such as lens. In addition, a smaller concrete volume is expected to have a similar resistance capacity as the other types of foundations which have the similar bearing area. To get the load which works to the foundation, the author did the superstructure modelling by using ETABS 2013. The calculation of carrying capacity is based on the results of the Standard Penetration Test (SPT) by using the Terzaghi & Peck method; moreover, the calculation of group eficiency used the Converse-Laberre method. The calculation of elastic settlement refers to the settlement permit of SNI 8460:2017. Moreover, this project also analyzes the pile head shift, the calculation of thickness and reinforcement of pile cap. From the calculation by using spun pile foundation with 600 mm class A1, the number of spun pile in a group at A1 point is 20 piles while in A2 point, it is 6 piles. The dimention of the pile cap at A1 point is 10200 mm × 8100 mm with the reinforcement in direction: x-axis is D25 - 125 mm and y-axis is D25 - 100 mm. However, the dimension of the pile cap at A2 point is 3900 mm × 6000 mm with the reinforcement direction: x-axis is D25 - 125 mm and y-axis is D25 - 125 mm.

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