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利用当地材料修建桥梁可以降低成本。在地方道路上,一般永久性桥涵的修筑,大多采用石料,因此怎样经济合理地利用当地石料,是值得我们研究的。比如说,关于石砌圬工方面就有下列问题: 1.有不少山场石质好,数量多,但开不成料石; 2.各种料石需要化大量的清料工时; 3.当料石某一边的厚度不足而用砂浆填充时,容易出毛病,因为砂浆标号与料石强度不同。
Using local materials to build bridges can reduce costs. On the local roads, the construction of the permanent bridge and culverts is mostly made of stone, so how to use the local stone materials economically and reasonably is worth our study. For example, there are the following problems with stone masonry: 1. There are many mountain stony rock with good quality and quantity, but can not open stone; 2. A large amount of clear material man-hours are required for various stone materials; When the thickness of the material on one side of the lack of use of mortar filling, prone to failure, because mortar grades and stone strength.