Skripsi PENGGUNAAN GROUND ANCHOR, SOLDIER PILE DAN COFFERDAM UNTUK PENGENDALIAN BANJIR AIR ROB KOTA SEMARANG

Pemerintah Kota Semarang sedang membangun tanggul di

Kali Tenggang dalam upaya penanganan menanggulangi banjir

air rob. Upaya yang dilakukan adalah untuk mengendalikan

luapan banjir air rob (pasang) agar mampu menahan luapan air

ketika banjir air rob (pasang) datang dan menahan agar tidak

terjadinya keruntuhan tanah yang berdampak pada bangunan

pemukiman warga setempat yang berada di pinggir Kali

Tenggang. Saat ini pihak Dinas PU (Pekerjaan Umum) Kota

Semarang, kurang puas dengan hasil perencanaan yang sudah

ada pada kondisi eksisting Kali Tenggang. Oleh karena itu,

diperlukan review design eksisting agar mengetahui hasil yang

sesuai dengan kondisi eksisting yang aman.

Pada penulisan Tugas Akhir ini dinding penahan tanah akan

dihitung kembali agar mengetahui angka keamanan dalam kondisi

eksisting. Sementara itu kondisi lapangan agak sulit dalam

pelaksanaan, dan keterbatasan biaya. Maka perhitungan ulang

kondisi eksisting dan penggunaan alternatif Ground Anchor,

Soldier Pile dan Cofferdam untuk perkuatan dinding penahan

tanah akan dilakukan agar mendapatkan hasil perkuatan yang

aman, ekonomis, dan effisien.

Dari hasil perhitungan analisis yang telah dilakukan

didapatkan kedalaman kondisi antara pemukiman-kali tenggang

sedalam 7,4 meter dan kedalaman kondisi antara tambak-kali

tenggang sedalam 5,6 meter. Hasil perencanaan pertama struktur dinding penahan tanah menggunakan Sheet Pile Beton dengan

capping beam 90x70 cm serta balok penahan 70x50 cm

menghabiskan dana Rp. 68.143.897.307, perencanaan kedua

struktur dinding penahan menggunakan kombinasi Sheet Pile

Beton dengan Ground Anchor sepanjang 1 meter menghabiskan

dana Rp. 77.905.021.907, perencanaan ketiga struktur dinding

penahan menggunakan soldier pile diameter 1 m dengan jumlah

tulangan yang dibutuhkan 28 D19 menghabiskan dana Rp.

54.619.166.966, dan perencanaan keempat struktur dinding

penahan tanah menggunakan kombinasi Sheet Pile Beton dengan

Cofferdam (Sheet Pile Baja) menghabiskan dana Rp.

99.515.328.317.

Semarang City Government was building the embankment at

the Time Lag in its efforts to cope with the flood of water handling

rob. Efforts are being made is to control a water flood overflow

rob (pairs) to hold the overflow of water when water floods rob

(pairs) come and arrest so as not to impact the occurrence of soil

collapse on the local residential buildings located on the edge of

Time Lag. Currently Department of PU (public works) the city of

Semarang, was less satisfied with the results of planning already

on the existing condition of the Time Lag. Therefore, the existing

design review is required in order to find out the results that

correspond to existing conditions.

On the writing of Thesis of this soil retaining walls will be

counted again in order to know the existing condition of security

in numbers. Meanwhile the condition of the pitch was a bit difficult

in implementation, and cost constraints. Then restart the existing

condition calculation and use of alternative Ground Anchor,

Soldier Pile Cofferdam for the retaining walls and the retaining

wall will be carried out in order to get the retaining a safe,

economical, and disappear.

From the results of the calculation of the analysis that has been

done by mobilising the depth conditions between the settlement

lag-times as deep as 7.4 meters and a depth of conditions between

the embankment-grace period time as deep as 5.6 meters. The

results of the first planning the structure of the retaining walls of soils using Sheet Pile concrete capping beam 90x70 cm and 70x50

cm in retaining beam spent the funds of Rp. 68,143,897,307,

planning a second structure retaining walls using a combination

of Sheet Pile Concrete with Ground Anchor along the 1 meter

spend the funds of Rp. 77,905,021,907, planning the third structure

retaining walls using soldier pile diameter 1 m with the amount of

reinforcement required 28 D19 spend the funds of Rp.

54,619,166,966, and Fourth planning structure of the retaining

walls of soils using a combination of Sheet Pile Cofferdam concrete

(Steel Sheet Pile) spend the funds of Rp. 99,515,328,317