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关灯 护眼:开 字号:中

第1262章

    “顾名思义,此坝全靠自身重量,坐镇河床,抵挡水压。以铁筋为骨,水泥砂石浇筑成一体,形如山岳。其坝体可修得极厚极实,任你洪水滔天,我自岿然不动。尤适于河谷和地基坚实之处。”
    他接着抽出第二张图:“第二种,拱坝。”
    图上坝体呈现优美的弧形,两端嵌入山体,像一张拉满的弓。
    “此坝巧借地形与力学。利用水泥铁筋可塑性,将坝体修成向上游凸出的弧形。洪水压力袭来,通过坝体传递至两侧山体,由山岩承受大部分力量。用料比重力坝省,但对地形和两侧山体岩性要求极高。”
    随后是第三张、第四张……“支墩坝”、“连拱坝”……一张张草图,虽然笔法不算顶尖,但结构清晰,原理标注明白。
    值房里鸦雀无声,只有图纸传递时轻微的沙沙声,和越来越粗重的呼吸声。
    这些图,这些想法……简直闻所未闻,见所未见!
    刘主事拿着那张“拱坝”的草图,手都有些发抖。
    他干了半辈子河工,脑子里瞬间就闪过好几处适合修建这种坝体的险要河谷!
    若真能成……那将是何等壮观的工程!又能解决多少水患!
    “王、王大人!”一个头发花白的老员外郎颤声开口,他是司里技术最扎实的老人之一。
    “这……这些坝型,构思之精妙,确非凡俗!只是……这铁筋水泥浇筑如此巨物,如何施工?如何确保铁筋不锈?水泥在深水中如何凝结?坝体之抗水冲击计算,又如何精准?稍有差池,便是溃坝之祸,生灵涂炭啊!”
    问题直指核心,也是所有人最担心的地方。想法是好的,可怎么实现?靠不靠谱?
    王明远神色平静,显然早有准备。
    “陈员外郎所虑极是。”他点点头。
    “此非一蹴而就之事。任何新坝型,未经充分验证,绝不可贸然用于大江大河。”
    他敲了敲桌子:“所以,我定下一条规矩。自今日起,凡都水清吏司设计之新式水利设施,无论是坝是闸是渠,必先经过‘模型试验’。”
    “模型试验?就和之前的‘束水攻沙’模型那样吗?”有之前做过束水攻沙项目的官员发问。
    “不错。”王明远解释。
    “便是按真实工程缩小数十倍、数百倍,在衙署后院的空地上,以相同材料、相同工艺,先造一个小号的出来。
    然后,引水模拟洪水冲击,观测其受力、变形、渗漏等情况。何处薄弱,何处需加强,皆在模型上一一验证、改进。直到模型经受住考验,方可考虑实地建造。”
    他顿了顿,语气加重:“此法看似繁琐费时,却能极大避免纸上谈兵,将隐患消除于动工之前。”
    “咱们是修水利,不是儿戏,每一步都得踏稳了。这模型试验的花费,远比修一座败坏的实坝要小得多,也更对得起朝廷的银子,对得起下游的百姓。”
    一番话,说得众人心服口服,连连点头。
    是啊,先在模型上试,失败了不过损失些小钱和材料,总比真修起来垮了强百倍!王大人这法子,稳妥!
    “此外,关于铁筋防锈、水下浇筑等工艺难题,物料清吏司那边已在攻关,有了些眉目。届时还需诸位一同细化施工细则。”
    王明远补充道,“今日提出这些,是给大家一个方向。具体到某一条河,某一处坝,采用何种坝型,需实地勘测后,结合模型试验结果,再行定夺。断不可生搬硬套。”
    “大人思虑周详,下官等佩服!”刘主事由衷道。其他官员也纷纷附和,脸上露出了兴奋之色。

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