Horizontal mounting tool for stiffening ring of large pressure steel pipe von SU DA, QIU MU ASAZI, QI MEILIAN, YANG KAIWEI, GUO MING, TANG XINJIN, XU YUNPENG, LIU LULU, SUN WEN, HE XIDE, YANG MINGCONG, QIU XIAOBING, CHANG HONGBIN, HE BIYANG, WANG GANG, LI FUBING, WU XIANQIANG, YU CHUANG, ALUO DAWA, ZENG HONGFU

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