如何做好屋面防水工程施工质量的控制

要想做好屋面防水工程施工，在进行屋面防水工程施工时应严格按照国家规定的要求进行，采用符合标准的防水材料进行。若在设计、建设和维护的任何一个环节中出现漏洞，那么屋面防水工程施工质量也会受到影响。     

Thermal performance and embodied energy analysis of a passive house – Case study of vault roof mud-house in India

This paper investigates thermal performance of an existing eco-friendly and low embodied energy vault roof passive house (or mud-house) located at Solar Energy Park of IIT Delhi, New Delhi (India). Based on embodied energy analysis, the energy payback time for the mud-house was determined as 18 years. The embodied energy per unit floor area of R.C.C. building (3702.3 MJ/m²) is quiet high as compared to the mud-house (2298.8 MJ/m²). The mud-house has three rooms with inverted U-shape roof and remaining three rooms with dome shape roof. A thermal model of the house consisting of six interconnected rooms was developed based on energy balance equations which were solved by using fourth order Runge Kutta numerical method. The predicted six room air temperatures were found in good agreement with the experimental observed data on hourly basis in each month for one year. The annual heating and cooling energy saving potential of the mud-house was determined as 1481 kW h/year and 1813 kW h/year respectively for New Delhi composite climate. The total mitigation of CO₂ emissions due to both heating and cooling energy saving potential was determined as 5.2 metric tons/year. The annual carbon credit potential of mud-house was determined as € 52/year. Similar results were obtained for the different climatic locations in India.     

防水卷材在屋面工程中的设计与应用

对现今屋面防水卷材的种类与特点作出了归纳和分析，对卷材屋面防水设计应用提出了注意事项。     

以兴城古城周家住宅为例谈囤顶民居形制

以辽宁兴城周家住宅为例,从囤顶民居的平面布局、梁架结构、墙体及屋面构造四个方面进行了分析,对囤顶民居形制进行了探讨,对于研究民国辽西建筑风格有极大的参考价值。     

内嵌式永磁同步电机改进型解耦控制

内嵌式永磁同步电机(IPMSM)具有好的转矩性能和宽的调速范围,但其电流控制器需要精确的参数模型,由于饱和效应影响,电感参数会随运行条件不同发生改变,控制器受耦合影响,系统容易出现速度及转矩超调、扰动等现象。为了提高IPMSM恒转矩及恒功率区的控制性能,本文设计了一种改进型电流解耦控制器。控制器基于模型参考自适应法对参数进行在线检测,检测系统加入了前馈及闭环反馈,保证了参数检测的准确性及鲁棒性。这种解耦电流控制器结构简单、紧凑,有效改善了控制性能。实验和仿真结果表明,这种改进型控制器能有效准确的实时在线检测参数,同时使得整个系统响应速度快、无超调、系统转速稳定无扰动现象,能明显地提升系统性能。     

撞楔法支护在平硐冒顶段施工中的应用

该文介绍了在老平硐恢复过程中,撞楔法在冒顶段施工中的应用情况。实践证明,该方法能有效的通过类似地段,并取得显著的经济效益,为其他类似工程提供了有益的参考。     

急倾斜煤层浅部开采顶板破断致灾原理与控制

为掌握急倾斜煤层浅部开采时顶板的破断规律,确保水平分段综放开采时的安全生产,采用物理相似模拟实验研究急倾斜煤层浅部开采时顶板的垮落规律,通过力学建模分析顶板垮落的条件,运用3DEC对人工爆破强制放顶的效果进行了数值模拟与分析。研究结果表明:浅部开采时急倾斜煤层的顶板不易垮落,容易出现大面积悬顶现象。工作面上方覆岩大面积垮落,产生冲击矿压,危害工作面安全生产;而在第一分段、第二分段回采过程中采用强制放顶的措施可以有效削减顶板的势能,顶板垮落后形成的覆浮矸垫层也可以保证急倾斜煤层下分段的生产安全。     

液压支架与工作面顶板耦合分析

根据液压支架支护特性和工作原理,给出将支架简化为具有一定弹性系数的弹性体的理论依据,充实了采场围岩与液压支架整体力学模型理论基础。在此基础上,推导出了液压支架顶梁载荷分布规律,理论结果与实验数据基本一致,从而验证了液压支架与顶板耦合关系模型的正确性,为相关研究深入开展创造了条件。     

随钻测量定向钻进技术在矿井顶板水患治理中的应用研究

西北侏罗系顶板裂隙水害是我国煤矿水害主要类型之一,严重影响了矿井的正常生产,并构成了安全隐患。提出采用随钻测量定向钻进技术施工定向长钻孔进行顶板水探放的治理方案,并对钻进成孔工艺和钻探装备进行了选配。选择红柳煤层3121工作面进行了现场应用,施工的定向长钻孔终孔平均出水量是相邻工作面常规钻孔的2.69倍,相同疏放周期时放水量是常规钻孔的41.5倍,成功对2个顶板含水层进行探放并达到安全开采要求,起到超前长距离区域探放顶板水的效果,同时可节约78%工期。现场应用情况表明,随钻测量定向钻进技术在顶板水害防治中具有广阔的应用前景,可为类似矿井提供参考。     

Wind Force Coefficients for Designing Porous Canopy Roofs

Wind force coefficients for designing porous canopy roofs have been investigated based on a series of wind tunnel experiments. Gable, troughed and mono-sloped roofs were tested. The roof models were made of 0.5 mm thick perforated duralumin plates, the porosity of which was changed from 0 to about 0.4. Overall aerodynamic forces and moments acting on the roof model were measured in a turbulent boundary layer with a six-component force balance for various wind directions. The results indicate that the wind loads on canopy roofs generally decrease with an increase in porosity of the roof. Assuming that the roof is rigid and supported by the four corner columns with no walls, the axial forces induced in the columns are regarded as the most important load effect for discussing the design wind loads. Two loading patterns causing the maximum tension and compression in the columns are considered. Based on a combination of the lift and moment coefficients, the design wind force coefficients on the windward and leeward halves of the roof are presented for the two loading patterns as a function of the roof pitch and porosity. The effect of porosity is taken into account as a reduction factor of the wind loads.