朔黄铁路钢筋混凝土涵洞重载改造技术研究

发布时间：2018-05-26 19:19

本文选题：重载运输 + 钢筋混凝土涵洞　；参考：《中国铁道科学研究院》2015年硕士论文

【摘要】：铁路重载运输因其具有运输能力大、效率高、运输成本低等优势而受到世界各国的广泛重视。朔黄铁路作为我国主要重载铁路之一,为适应不断增长的煤炭运输要求,朔黄铁路亟需提高铁路运输能力。本文以朔黄铁路钢筋混凝土涵洞为研究对象,对30t及以上轴重货车作用下涵洞的承载能力和重载改造技术进行了研究。对涵洞按中-活载之特种荷载图式轴重250～350kN加载进行检算,结果表明：在设计活载作用情况下,混凝土压应力、钢筋拉应力、主拉应力及裂缝宽度均满足设计要求,在中一活载条件下,仍有一定的剩余。在运行30t轴重货车时,涵洞的一些控制截面已经不能满足运营荷载的要求,具体表现：涵顶无填土工况控制设计,填土厚度小于1.0m的盖板受轴重提高影响较明显,轴重提高后普遍超过规范限值；低边墙框构涵底板跨中下缘钢筋应力在主力组合时超过规范限值；同时,低边墙框构涵比中、高边墙受力更为不利,对轴重提高的反应也更明显。涵洞实体试验结果亦表明,30t大轴重货车对涵洞的作用效应(钢筋应变、跨中挠度)均大于运营列车作用效应,最大分别超过10%～22%、9%～18%。因此,为确保重载货物列车运营安全,必须进行加固改造。以1.2倍ZH活载作用下的涵洞结构效应不超过改造前中-活载作用下的效应并满足现行规范的要求为加固目标,针对涵洞的不同情况拟定了相应加固方案,并对其中加固方案的加固效果进行了详细检算,检算结果表明所提方案均能改善结构受力,达到涵洞重载改造的目的,对保证朔黄铁路重载运输顺利实施具有重要意义。
[Abstract]:Railway heavy haul transportation has been paid more and more attention all over the world because of its advantages of large capacity, high efficiency and low transportation cost. Shuohuang Railway is one of the main heavy-haul railways in China. In order to adapt to the increasing demand of coal transportation, Shuohuang Railway urgently needs to improve the capacity of railway transportation. Taking the reinforced concrete culvert of Shuohuang Railway as the research object, the bearing capacity and heavy load modification technology of the culvert under the action of 30 t and more axle load freight cars are studied in this paper. The 250~350kN loading of culvert according to the special load schema of mid-live load is calculated. The results show that the compressive stress, the tensile stress, the main tensile stress and the crack width of concrete meet the design requirements under the condition of design live load, the concrete compressive stress, the steel bar tensile stress, the main tensile stress and the crack width are all satisfied with the design requirements. There is still a certain amount of surplus under the condition of medium-1 live load. Some control sections of culvert can no longer meet the requirements of operation load when running a 30t axle load truck. The concrete manifestation is: the control design of the working condition of culvert without filling, the cover plate with filling thickness less than 1.0 m is obviously affected by the increase of axle load. When the axial load is increased, the limit value of the code is generally exceeded; the stress of the steel bar at the middle and lower edge of the bottom span of the culvert with low side wall frame structure exceeds the limit value of the code when the main force is combined; at the same time, the stress of the high side wall is more disadvantageous in the low ratio of the frame to the culvert, The response to the increase of axle load is also more obvious. The results of solid test of culverts also show that the effect on culverts (reinforcement strain, mid-span deflection) of large axle loads of 30 tons is greater than that of running trains, and the maximum value is more than 100.22229% and 18.8% respectively. Therefore, in order to ensure the safety of heavy-haul freight train operation, it is necessary to strengthen and transform. Considering that the culvert structure effect under 1.2 times ZH live load does not exceed the mid-live load effect before the transformation and meets the requirements of the current code, the corresponding reinforcement scheme is proposed for the different conditions of the culvert. The results show that the proposed scheme can improve the stress of the structure and achieve the purpose of the culvert heavy load transformation. It is of great significance to ensure the smooth implementation of heavy haul transportation of Shuohuang railway.
【学位授予单位】：中国铁道科学研究院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U449.5

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