I-Tianjin Rainbow iqhubeka nokuletha izinsika zodonga ezigcina impahla emakethe yase-Australia. Inkampani yethu igxile ekukhiqizeni ama-Lintels, udonga oluhlanganisiwe olunama-degree angu-45 no-90, ugongolo lwe-H, isiteshi se-U, iphrofayili yokwakheka kwe-C. Lesi sithombe sokulayisha sithathwe ngoMsombuluko. Ngifisa sengathi inkampani ethengisa ngobuningi noma yokwakha izakhiwo izofika kithi.