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一、前言《铁路桥涵设计规范》(TBJ2—85)第2.2.5条规定桥下净空高度应符合表2.2.5的有关容。该条文的说明为“……。在河床逐年淤积抬高的河流上,桥下净高尚须考虑淤积的可能而适当加高。……。”但对于洪水位及河床同时各以不同速宠逐年抬高的河流,桥下净空高度应如何考虑,尚无规定,似应补充完善。 1.黄河下游艾山以下防洪水位年平均升高为O.126m,这数值系黄委会以黄工字(1980)5号文规定的,至今仍在沿用之中,
I. Preface Section 2.2.5 of the Code for Design of Railway Bridges and Culverts (TBJ2-85) stipulates that the clearance height under a bridge should meet the requirements of Table 2.2.5. The description of the provision reads as “... On the riverbed that has been silted up year by year in the riverbed, the net height under the bridge must be appropriately increased in consideration of the possibility of siltation ...”. However, for floodplains and riverbeds, Elevated river, under the bridge headroom should be how to consider, there is no provision, it may be added to improve. 1. The average annual flood control water level below the Aishan River in the Lower Yellow River is O.126m, which is determined by the Yellow River Committee (No. 5) written in Huanggongzi (1980) and is still in use today.