A semi gantry crane is a gantry crane with one leg running along a ground track while the other end of the bridge is supported by a truck running along an overhead track.

Semi gantry cranes, with their unique structure and practicality, have become an indispensable member of modern industry. It is particularly suitable for light and medium-duty lifting tasks, such as cargo loading and unloading, machine equipment maintenance, various applications in docks and factories, etc.

Derek gantri balok tunggal terutama terdiri dari jembatan (balok utama), empat cadik, balok bawah, perangkat penggerak kereta, kontrol listrik, kerekan listrik, dll. Rangka jembatan (balok utama) dari derek gantri balok tunggal umumnya struktur berbentuk kotak yang dilas dengan pelat baja. Bagian bawah balok utama dilengkapi dengan lintasan balok-I untuk pengoperasian kerekan listrik. Ini juga dapat digunakan untuk balok utama gantry crane bentang besar yang bekerja di luar ruangan. Struktur rangka yang dibentuk dengan pengelasan baja bagian memiliki kekakuan yang kuat (terutama kekakuan horizontal), ringan, luas angin kecil, dan memiliki manfaat ekonomi yang tinggi. Namun produksi dan pengelasan struktur ini lebih rumit dan sulit dibandingkan struktur berbentuk kotak.

Semi-gantry crane is suitable for lifting, transporting, loading and unloading in open-air working places such as stations, docks, warehouses, construction sites, cement product yards, machinery or structural assembly yards, power stations, etc. It is also suitable for working in indoor workshops.

The jib of a crane is an extension or an arm that protrudes from the main body of the crane. It is an important component that enhances the crane's reach and lifting capabilities.

Jib cranes, also known as swing cranes, are versatile lifting devices widely used in various industries.