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    Combined work analysis of underground penstock based on imperfect contact consideration
    考虑不密实接触地下埋管联合受力分析
    It can not only make the quality of concrete filled in steel tubes obtain the guarantee to solve the problem of drying shrinkage and creep of concrete,but also solve the problem that the concrete is restrained insufficiently.
    将其应用于钢管混凝土内,不仅可以解决钢管混凝土浇注不密实,混凝土干缩、徐变等问题,而且还可以解决自应力混凝土约束不足的问题.
    Detecting concrete lacuna and holes by ultrasonic
    超声波检测混凝土不密实区和空洞
    (2)Under the operation case, considering the gap between steel lining and concrete lining as imperfect contact, contact layer is proposed to simulate the gap in the combined work analysis.
    (2)基于对钢衬与混凝土衬圈之间不密实接触的考虑,提出在钢衬和混凝土之间设接触层进行钢衬、混凝土衬圈和围岩联合受力分析。 通过联合受力的解析推导,进行钢衬和围岩压力分担比对接触层参数(弹模和厚度)敏感性分析。
    Filling without uniformity and denseness will cause various defects and affect the quality of the surface.
    泡沫珠粒在模具中充填不均或不密实会使模样出现残缺不全或融合不充分等缺陷,影响产品的表面质量。
    At present the problem that duct grouting is not compacting is very serious in the bridge engineering. Some problems are researched to improve the quality of conventional grouting method by improving the grouting materials and the grouting technology based on the ChuHe great bridge at AnHui province.
    目前孔道压浆不密实的问题在桥梁建设中十分突出,本文依托安徽省滁宁高速公路滁河特大桥建设工程,对如何通过改善灌浆材料性能和压浆工艺来提高常规压浆法孔道压浆质量进行了研究。
    Due to insufficient vibrating compaction in concrete pouring ,there occurred cavity pockets in the concrete near the copper sheet seal in the transverse joints inside the dam body of 2nd stage project of Lingjintan Hydropwer Station.
    凌津滩水电站二期工程 ,其坝体横缝止水片附近混凝土因浇捣不密实 ,出现脱空现象 ,灌浆廊道内坝体横缝漏水。
    It is shown by analysis that the cracks in concrete lining of the tunnel through Shenhe and Shaoling highlands of heihe project are caused synthetically by construction cold joints, concrete contraction, not compact densely and load.
    分析了神禾塬、少陵塬隧洞混凝土衬砌裂缝是施工冷缝、混凝土收缩、振捣不密实和荷载作用等因素综合影响的结果。
    of pores from capillary with better interconnection and pore spaces with less dense structure during construction, etc. , the soluble type corrosion of environmental water for Ca(OH) 2 substance will be mainly the relatively concentrated leakage pattern, which is rather unfavored to anti-chemical corrosion.
    指出在具较好连通性的毛细孔及施工不密实孔等部位 ,环境水对于Ca(OH) 2 一类物质的溶出型侵蚀作用将以相对集中的渗漏方式为主 ,因而对于大坝的抗化学侵蚀性较为不利 ;
    Through check measurement and analysis, it is considered that the cause of water seepage and water logging at the toe in Levee Reach 53K is un-compaction in levee body and higher phreatic line.
    通过直流电阻法、同位素示踪法检测 ,浸润线、承压水影响和历史资料分析 ,认为堤身内部不密实、浸润线高导致 5 3K堤段堤脚渗水 ,青坎地洇潮、积水。
    We shall have an introduction and an analysis to the reason,the prevention measures and the treatment methods of the strength error,incompact surface,not dense rolling,bad trimming and crack of cement stabilized base course.
    介绍、分析了水泥稳定基层强度偏差、表面松散、碾压不密实、平整度差、裂缝的产生原因、预防措施及处理办法。
    It is not very compact from the section picture of radar wave shape in analyzing empty cavity.
    在雷达波形剖面图上分析 空洞、不密实异常,推断出大量隐患。
    (2) This method can use a very wide frequency band of reflection wave induced by hammer source, and the wave-time curves of stations in a line can form a time-profile, and by analyzing frequency spectrum, phase and amplitude of reflection wave and superposition of waves, the following can be determined or detected: the thickness of lining, the cavities and empty areas behind the lining, the position of low density in concrete.
    可在衬砌表面用锤击震源激发和接收极宽频的反射波,可将测线上各测点的时间曲线汇成时间剖面图像,并可通过反射波的频谱、相位、振幅及波的叠加分析等探查衬砌厚度、衬砌背后空洞、空区,尤其是可探出混凝土中因振捣不好而产生的不饱满、不密实部位。
    Through engineering example it is shown that the said combination is effective for the inspections of the thickness of liner wall, the structure of the designed component, the occurrence of faults, the interstice and the under-densification.
    并通过实例说明由此检测隧道的衬砌厚度、设计构件的结构、断层、空隙、脱空及不密实等隐患 ,是行之有效的组合方法。
    Combined with constructive practice of highway project,it analyzes common problems in hollow board prefabrication from aspects of over thickness in bottom of prefabricated hollow board、under thickness in top of the board and thin concrete in bottom of the board and puts forward effective resolving measures.
    结合多年高速公路工程施工实践 ,针对空心板预制中的常见问题 ,从预制空心板底板超厚、顶板厚度不足、空心板底混凝土不密实等方面进行了原因分析 ,并提出了有效的解决措施。
    Based on the partial destruction of Liqiao reservoir during Minle earthquake in Gansu province,Ground Penetrating Radar is used to study the seepage disease resulting from incompact earthfill in the course of construction.
    以甘肃省民乐山丹地震时受到一定破坏的李桥水库为对象,用探地雷达对水库大坝填土不密实引起的渗漏病害进行了探测研究。
    Considering the gap between steel lining and concrete lining as the imperfect contact,contact layer is proposed to simulate the gap in the combined work analysis.
    针对这种不密实接触问题,采用厚壁圆环组合环法,提出了在钢衬和混凝土之间设置接触层的钢衬、混凝土衬圈和围岩三者联合受力分析方法。
    If there are lacunas or holes in concrete structure, it will affect the supportability and endurance of concrete structure seriously.
    混凝土结构内部若存在不密实区或空洞等缺陷,必然会严重影响结构的承载能力和耐久性。
    This article, combined with an example of engineering, narrates the ultrasonic detection theory, and introduces the data processing in detail. The result is ideal.
    结合工程实例,阐述了采用超声波检测混凝土不密实区和空洞的原理、方法,并详细介绍了检测数据处理过程,结果表明用超声波检测混凝土不密实区和空洞效果较理想。
    But the nature of the cement concrete cause unavoidable"brittle behavior" and "non compactness", Which make it not satisfy more application require,especially it can't satisfy the application under the bitter environment.
    但是,水泥混凝土本身造成的“脆性”和难以完全避免的“不密实性”,使它不能满足更多方面的使用要求,尤其不能满足在严酷环境中的使用。
 

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