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河北省天津专区是一个大平原,不产石料和木料,公路沿线的土质,大部为粘土性土壤。由于全区碱洼地过多,一般砖涵,经过两、三年后,砖砌表面发生风化,侵蚀深度浅约达1～2公分,深的达10公分多。为了防止冰冻和盐碱对桥涵材料的侵蚀和分解,不得不在某些干线上用木料及钢筋混凝土等材料来修建小桥涵。钢筋混凝土涵洞造价高昂,而木料修建的小桥涵虽较钢筋混凝土涵洞造价低,但比起廉价的砖料来,还是价格较高的,而且养护也比较麻烦。如能就地采用砖来修建
Tianjin area in Hebei Province is a large plains, does not produce stone and timber, along the highway soil, mostly clay soil. As a result of too much alkaline depression, the general brick culvert, after two or three years, the brick surface weathering, erosion depth of about 1 to 2 cm, deep up to 10 cm. In order to prevent freezing and salt alkali erosion and decomposition of bridge materials, had to use some materials such as timber and reinforced concrete to build bridges and culverts. The cost of reinforced concrete culverts is high, while the cost of constructing small bridges and culverts is much lower than that of reinforced concrete culverts. However, it is still more expensive and cheaper to maintain than cheaper brick materials. If you can use brick to build in situ