This paper analyzes the underground pipelines of three large rainwater steel pipelines(1200mm rainwater pipe,600mm sewage pipe and 920mm pressure sewage pipe with a diameter of 1200mm rainwater pipe,600mm sewage pipe,and 920mm pressure sewage pipe)in the excavation of the B-end Fengting foundation pit of the northern extension of Guangzhou Metro Line 8,and these three large pipelines need to be protected in situ for the smooth progress of the process.It is proposed to use the beret beam suspension,and the suspension beam support foundation is set at the top of the crown beam of the enclosure wall,the support spacing is 43m,and the lateral spacing of the beret sheet is 4.3m.The transverse connection is made of 20A I-beam,with a spacing of 1000mm.Φ22 steel bar is used as the boom,and the special stainless steel basket bolt is set in the middle of the boom as the intermediate adjuster,and the spacing is 1000mm.In the process of pipeline suspension,by adjusting the special stainless steel basket bolts,the settlement control of pipeline suspension protection is realized,and the safety of pipeline suspension is ensured.
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