共查询到20条相似文献,搜索用时 46 毫秒
1.
对于抗浮不满足的水池,根据水文条件、场地地质情况、抗浮不满足产生的危害程度、工期和工程经济性,从常见的抗浮措施包括增加配重法、抗浮桩、锚杆抗浮法和释放水浮力法中优选,确定应该采用的抗浮措施。 相似文献
2.
研究了具有薄膜套浮顶结构的容器的结构设计,提出了初始背压水水位和浮顶正常工作的原则,给出了确定浮顶背压水总容积、初始背压水位的方法,得出了浮顶背压水位计算的公式,其结果可为具有薄膜套的浮顶结构的容器的工业设计提供参考。 相似文献
3.
孙波 《中国石油和化工标准与质量》2012,33(Z1)
随着社会的告诉发展,建筑物的方位设计也更加强,建在天上的、地下的随处可见.那么,针对建筑物抗浮设计问题,对地下水的浮力与抗浮设计水位进行讨论,并对常用的抗浮方法进行系统的评价.在探讨抗浮桩设计中有关技术问题的同时,对抗浮锚杆技术的应用给予了简单的介绍. 相似文献
4.
6.
7.
8.
城市核心区土地资源缺乏,城市绿地率及地面建筑容积率等规划指标要求严格,利用绿地及公共场所等地下空间修建纯停车场等地下建筑成为必然趋势。成都平原区地层结构特殊和地下水位变化较大,目前利用锚杆与地基土间锚固力来平衡地下水浮力的措施出现的问题越来越多。为此,根据成都平原区抗浮锚杆检测资料和多起地下室抗浮锚杆出现的严重病害问题,就成都平原区抗浮锚杆病害问题原因和适宜性进行了探讨。结果表明,成都平原区地下抗浮设计水位因影响因素众多而确定困难,地下水丰富使施工质量难以控制,泥质基岩及含泥松散堆积物泥质成分和地下水的共同作用严重影响抗浮锚杆锚固力发挥和施工质量控制,锚杆锚固力发挥产生的变形与地下室底板结构变形严重不协调,是成都平原区抗浮锚杆地下建筑物结构出现众多变形的主要原因。在此基础上提出了成都平原区更加适宜的地下室抗浮方案和结构类型。研究结果可供相关建筑设计和施工参考。 相似文献
9.
10.
某石化公司重整装置增设了脱苯设施,其换热流程中设计有油水交换热量的浮头式重沸器,但该重沸器投用后多次出现渗漏。通过对该重沸器的选型、结构形式、材料、制造、现场拆装等多方面进行分析,找到了原因,提出了处理措施,使用后效果良好。 相似文献
11.
我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
12.
13.
14.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
15.
16.
17.
The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
18.
Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
19.
20.
A refined nonlinear value of the main parameter of a material, i.e., the elongation modulus versus the instant temperature value, was suggested for introduction into the computational algorithm of tempering stresses. 相似文献