就地取材,因地制宜,用石、砖、灰、土和干砌石料修建中、小跨径的桥涵,不但可以节约大量钢筋水泥,降低造价,而且我国广大劳动人民有修建这类桥梁的丰富经验,技术容易掌握;建成以后,坚固耐久,不象木桥涵需要经常养护维修。由于中、小跨径桥涵在公 Local materials and local conditions, the use of stone, brick, ash, earth and dry stone masonry to build medium and small span of the bridge and culvert, not only can save a lot of steel and cement, reduce costs, and our working people have extensive experience in building such bridges , Technology is easy to grasp; built, durable, not like the wooden bridges often need maintenance and repair. As the medium and small span bridges in the public