Iyo tsigiro furemu inoshandiswa kubatanidza mitsara yakawanda yematrusses kuve nechokwadi kugadzikana uye yunifomu simba rebhiriji truss unit. Iyo tsigiro furemu inogona kubatanidzwa kumusoro kwepamusoro chord kana vertical tsvimbo.
Kune matanhatu akajairika anotsigira mafuremu (anozivikanwawo semaruva mafuremu, maruva mahwindo);
Type 321 inowanzo: 450 rutsigiro furemu, 900 rutsigiro furemu, 1350 rutsigiro furemu;
200 mhando yakajairika: 480 yakachinjika tsigiro furemu, 480 yakatwasuka tsigiro furemu, 730 yakachinjika yekutsigira furemu, 730 yakatwasuka tsigiro furemu.
Rutsigiro rwerutsigiro rwakaita seizvi: chitsigiro chinoshandiswa kubatanidza mutsara wekutanga uye wechipiri mutsara wematrusses. Kaviri-mutsara-imwe-nyaya Bailey simbi bhiriji, pakati pepamusoro pepamusoro pega yega truss (kana yakasimbiswa chord), furemu yekutsigira inoiswa yakachinjika. Panyaya yemitsara yakapetwa kaviri uye maviri akaturikidzana, kunze kwekuisa furemu yekutsigira pamusoro pepamusoro, furemu yekutsigira inofanirwa kuisirwa kuseri kwetsvimbo yakatwasuka yekumusoro truss (tsvimbo imwe yakamira kumberi kwechikamu chekutanga iyo truss inofanirawo kuiswa). Pakumisa zambuko rine mitsetse mitatu, nzvimbo nenhamba yemafuremu ekutsigira zvakafanana nedzebhiriji rine mitsetse miviri. Paunenge uchiisa, isa 4 maburi maoko kumagumo ese ari maviri mumaburi erutsigiro emitsara miviri yematrusses, wozoagadzirisa nemabhaudhi ekutsigira.
Mumabhiriji edhishi, mazhinji esaizi yerutsigiro saizi i900 kana 1350, uye kune zvakare yakakosha tsvimbo yekubatanidza masisitimu zvinoenderana nezvinodiwa, uye mazhinji acho akaiswa nemabhaudhi ekutsigira.
Simbi angle inoshandiswa zvakanyanya mumhando dzakasiyana dzekuvaka uye chimiro cheinjiniya.
1.beam, mabhiriji, kuvaka,kutaurirana tower,chikepe.
2.transmission tower, reaction tower, masherufu emidziyo yekuchengetera zvinhu, nezvimwe.
3.kusimudza michina yekufambisa,kugadzira muchina wekurima.
4.industrial furnace.
5.container frame.