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桥梁是确保公路畅通的咽喉,没有桥梁的完好就没有公路的畅通。新建的高等级公路上大多是大跨径的钢筋混凝土或预应力桥梁,而普通公路特别是山区公路上中小跨径石拱桥占的比重很大。这些中小跨径石拱桥修建年代不一,有利用古代人行桥作为公路桥的。如湖南省娄底公路局管养的青(树坪)甘(棠)公路上的茶冲桥就是清朝光绪9年建成的人行石拱桥,更多的是20世纪50年代至60年代突击修建的。这些桥梁经常遭受山洪暴发等自然灾害的侵害,又饱受严重超载之苦难;加之,长期以来受重路轻桥,重建轻养的思想的影响,使得这些桥梁的技术状况普遍较差。很显然,加强对对山区公路中小跨径石拱桥的管养,及时修复与加固危桥、险桥,具有十分重要的意义。本文作者通过对一座石拱桥的修复实例,介绍了山区公路中小跨径石拱桥的修复与加固方法。
The bridge is to ensure the smooth flow of the throat, there is no bridge without the smooth road. Most of the new high-grade highways are long-span reinforced concrete or prestressed bridges, while ordinary, especially small and medium-span stone arch bridges on mountainous roads account for a large proportion. These small and medium-sized stone arch bridge construction varies from generation to generation, the use of ancient footbridge as a bridge. For example, the tea-red bridge on the Qing (Shuping) Gan (Tong) highway in Hunan Province under the supervision of Loudi Highway Bureau is the pedestrian stone arch bridge built in 9 years during the Guangxu reign of the Qing Dynasty. It was more the surprise construction from the 1950s to the 1960s. These bridges are often infested by natural disasters such as flash floods and are suffering from serious overloading. In addition, the bridge has been in a generally poor condition due to the impact of rebuilding roads and bridges and rebuilding light and raised houses for a long time. Obviously, it is of great significance to strengthen the management of stone arch bridges on small and medium-sized roads in mountainous areas and repair and reinforce dangerous bridges and bridges in time. Through an example of restoration of a stone arch bridge, the author introduces the methods of restoration and reinforcement of stone bridges in medium and small-span mountainous areas.