免振捣混凝土的配比设计理论也需要进一步地加以完善。
配制免振捣混凝土的关键是掺加能增强混凝土和易性的外加剂。
The key of compounding avoid vibration concrete is to mix the addition agent that can strength concrete amiability.
对12根经过长期荷载作用卸载后的自密实与振捣混凝土梁进行了静力试验研究。
This paper reports the test results of 12 beam specimens including 8 SCC simple beams and 2 vibrated concrete simple beams and 2 SCC continuous beams under static loading after long-term actions.
钢筋之间应该有足够的空间允许振捣器进入混凝土振捣和并使混泥土能良好的压实。
There should be sufficient space between the resulting columns of bars to allow access for vibrators and good compaction of the concrete.
混凝土振捣前做好试块留置组数计划，并检查现场试模是否够。
Before concrete vibration starts, plan well number of sets of sample blocks to be retained and check whether on-site form testing is enough.
基础模板支设不牢固，浇筑混凝土下料过高、混凝土振捣撞击，使模板位移，造成基准线产生偏差。
The foundation template support is not strong, the pouring concrete is too high, the concrete vibration impact, so that the template displacement, resulting in the deviation of the baseline.
并以工程实践为依据研究混凝土二次振捣的可行性。
It also studies the feasibility of concrete re - vibrating based on the engineering practice.
产生原因：振捣后没有用拖板、刮尺抹平；混凝土未达终凝就在上面行人和操作。
Reasons: No scraping work after vibration; People walks or works on concrete before final set.
而且还对自密实混凝土与同配比振捣成型混凝土的抗压强度进行比较。
Finally, the SCC is compared with the same mixing but vibrated concrete on compressive strength.
二是控制新拌混凝土的和易性，如果混凝土离析泌水，严格控制振捣时间，必须适时进行复振。
The second is control of workability of fresh concrete, if concrete isolation secretion of water, strictly control the vibration time, vibration rehabilitation must be timely.
混凝土浇筑过程采用正确的振捣方式和经纬仪跟踪监控，保证柱脚螺栓的预埋精度，提高了安装速度。
During concrete pouring, by selecting correct vibrating method and surveying with theodolite, the embedded precision of column bolt is assured and installation speed is improved.
本文介绍混凝土二次振捣的施工方法，并对二次振捣的机理进行了分析。
The construction method of concrete re-vibrating is introduced and the mechanism of re-vibrating is analysed in the paper.
针对门机大梁以上特点，对梁体模板设计、混凝土浇筑振捣、梁体张拉施工技术难点进行了深入研究。
As to the above characteristics of the gantry crane, the further study has been made for formwork design, concreting and vibrating and girder in tension.
提出对高抛免振捣自密实混凝土的工作机理、配合比设计、工作性评价方法及相应的试验方法。
Mechanism, Mix ratio design, workability evaluation and test method of high-dropping shake-free self-compacting concrete were put forward.
每一振点的振捣延续时间应使混凝土表面呈现浮浆和不再沉落为止，约20 ~30s。
For every vibrating point, the vibration shall go on till free mortar appears on the concrete surface and not sinks any more, normally 20 ~ 30s.
如果再加上振捣不合理，大气泡不能完全排出，肯定会给硬化混凝土结构表面造成蜂窝麻面。
If the unreasonable vibration, large bubbles can not be completely discharged, would certainly have resulted in hardening the surface of concrete structure surface cellular Ma.
本文介绍混凝土二次振捣的施工方法，并对二次振捣的机理进行了分析。
This article describes the method of secondary vibration of concrete construction, and analyzes the mechanism of secondary vibration.
根据碾压混凝土和稳定土材料的摊铺特点，分析了此类摊铺机振捣装置的工作原理，论述了振捣装置振幅的调整原则和振捣频率的选择。
The paper analyzes the working principle of tamping equipment of the paver and discusses the adjustable principle of amplitude of tamping equipment and selection of tamping frequency.
根据碾压混凝土和稳定土材料的摊铺特点，分析了此类摊铺机振捣装置的工作原理，论述了振捣装置振幅的调整原则和振捣频率的选择。
The paper analyzes the working principle of tamping equipment of the paver and discusses the adjustable principle of amplitude of tamping equipment and selection of tamping frequency.
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