地下车库通风方式分析

通过分析地下车库通风工程常规设计中存在的问题,对国内外近年来推广的诱导通风方式在车库中的应用进行了探讨,实践证明诱导型通风系统在技术经济上优于常规通风系统,值得推广应用。     

探讨诱导通风方式在地下车库通风工程中的应用

本文通过分析地下车库通风工程常规设计中存在的问题,对国内外近几年来推广的诱导通风方式在车库中的应用进行探讨。     

地下车库通风排烟设计探讨

阐述了地下车库通风排烟系统的特点和设计方法,针对国家标准中未明确的几个问题探讨了解决措施。     

地下车库常用两种通风排烟系统对比

介绍了两种通风排烟系统的设计,分析比较了两种通风排烟系统的优缺点,结果表明:相对于传统车库通风系统,采用诱导通风排烟系统可以节省大量运行费用及初投资成本,而且还具有更佳的通风效果。     

诱导通风系统在地下车库的应用

本文针对地下停车库的通风设计,对常规通风系统和诱导通风系统之间进行分析对比,并结合工程实例,阐述地下车库诱导通风与排烟系统的设计方法。     

诱导通风方式在地下车库通风工程中的应用探讨

本文通过分析地下车库通风工程常规设计中存在的问题，对国内外近几年来推广的诱导通风方式在车库中的应用进行探讨。     

地下车库潮湿结露现象及防治措施浅析

潮湿结露现象是地下车库环境中的一个通病,严重影响着地下车库的使用性能和品质。本文以人生港湾·南欧城一期地下汽车库工程为例,分析地下车库产生潮湿结露现象的原因,并从设计和使用方面提出相应的防治措施,从而对地下车库工程的设计和使用提出总结和思考。     

关于地下车库的通风设计

本文分析了汽车污染物的危害及散发有害物的四个来源，提出了地下车库污染物的计算式，介绍了稀释污染物所需要的排风量计算方法；分析并指出间歇通风方法可满足车库洋稳定通风状态的有害物浓度要求，最后分析了气流组织形式及系统运行和控制方法。     

喷流诱导系统在地下车库通风气流组织方面的应用

喷流诱导系统是一种新型的通风系统形式，是以少量高速喷出的气体来诱导和搅拌周围的大量空气并带动至特定方向，该系统可以解决特殊空间如地下车库内的通风问题．     

某地下车库的采暖通风设计

根据某地下车库的采暖、通风和排烟设计的设计方案和特点,提出了地下车库暖通设计中应注意的几个问题,重点探讨了地下车库排风系统和排烟系统相结合的具体做法,比较了地下车库几种采暖方式的优缺点,从而确定了符合本工程的最佳方案。     

The use of the subsurface in Reykjavik, Iceland

The geological setting of the Reykjavik, Iceland, area is characterized by young volcanic rocks close to the spreading axis of the Mid-Atlantic Rift. The subsurface has riches in the form of cold water in the most permeable rocks, hot water in the less permeable rocks, and in the geothermal steam fields at volcanoes in the spreading axis of the Mid-Atlantic Rift. Underground space excavations have not been performed in the Reykjavik area, nor have any serious plans been made for their use.     

The effect of a subsurface barrier on the conservation of freshwater in coastal aquifers

An investigation has been undertaken to study the effect on the water table and the shape of a freshwater/seawater interface produced by an impermeable subsurface barrier partially embedded into an unconfined coastal aquifer. Considerations are restricted to steady flow in an isotropic aquifer. Shape factors describing the distribution of mass density and of the velocity are introduced and their values derived. From the laboratory model study using a vertical plane Hele-Shaw model the velocity shape factor was determined. It was approximately unity for flow without a barrier, and decreased when a barrier was introduced. The barrier depressed the interface considerably and the upconing started with a higher flow rate as compared with the case without a barrier. By introducing the concept of a virtual origin it is shown that the free surface does not approach the seepage face tangentially. This was also confirmed experimentally.     

明确责任确保租赁设备安全使用

目前施工项目部使用的塔机及施工升降机(以下简称为设备)很大部分通过租赁公司租赁，但由于规章制度不齐全，出租方与租用方责任不明，引发设备事故频繁发生，致使设备安全生产形势不容乐观。对此，应加强相关法规建设，尤其需明确各方责任。     

Combined use of thermography and ultrasound for the characterization of subsurface cracks in concrete

Corrosion of metal reinforcement in concrete structures leads to cracks extending towards the surface. These cracks do not show any visual sign until they break the surface, exposing the structure to more accelerated deterioration. In order to develop a methodology for subsurface damage characterization, a combination of nondestructive testing (NDT) techniques was applied. Thermography is specialized in subsurface damage identification due to anomalies that inhomogeneities impose on the temperature field. Additionally, ultrasonic Rayleigh waves are constrained near the surface and therefore, are ideal for characterization of near-surface damage. In this study, an infrared camera scans the specimen in order to indicate the position of the crack. Consequently, ultrasonic sensors are placed on the specified part of the surface in order to make a more detailed assessment for the depth of the crack. Although there is no visual sign of damage, Rayleigh waves are influenced in terms of velocity and attenuation. Numerical simulations are also conducted, to propose suitable parameters like frequency for more accurate testing. The combination of the NDT techniques seems promising for real structures assessment.     

Innovative use of a sediment dumping area by the port as a car yard

The Port of Kotka is situated by the Baltic Sea and the river Kymi. The river transports into the estuary sediments containing pollutants. The dredging and dumping of the polluted sediments are challenging tasks, which are strictly monitored by the environmental authorities. In this study, we show how a former dumping area was converted into a car storage area in an innovative way. The construction on wetland base was extremely challenging. The field was built by using tyre scrap, which weighs only a quarter of the stone material's weight. The advantage of frost season was used during the construction phase, which reduces the costs. The Port of Kotka's solution to use polluted dredged material and waste material, in order to economically reclaim new land, sets a good example that can be used in other ports as well.     

生态混凝土对滨海地区绿化带土壤的盐分控制效果研究

为减少盐分对绿化带植物的影响,尝试采用生态混凝土控制盐分.按不同配合比拌制10 cm厚的生态混凝土,铺设于滨海地区土壤30 cm深处.结果表明:生态混凝土上方土壤全盐量出现不同程度的减少.较大的集料粒径、较小的水灰比和灰骨比拌制生态混凝土有利于其控制表层土壤盐分.将生态混凝土分层拌制,上层采用小粒径集料,下层采用大粒径集料拌制.可进一步强化控盐效果.上层采用10～16 mm碎石,下层采用16～35 mm碎石,按水灰比0.4,灰骨比1/8拌制的生态混凝土的铺设,将表层土壤全盐量控制在1.358 g/kg,控盐率达到30.29%.     

Innovative use of a sediment dumping area by the port as a car yard

The Port of Kotka is situated by the Baltic Sea and the river Kymi. The river transports into the estuary sediments containing pollutants. The dredging and dumping of the polluted sediments are challenging tasks, which are strictly monitored by the environmental authorities. In this study, we show how a former dumping area was converted into a car storage area in an innovative way. The construction on wetland base was extremely challenging. The field was built by using tyre scrap, which weighs only a quarter of the stone material's weight. The advantage of frost season was used during the construction phase, which reduces the costs. The Port of Kotka's solution to use polluted dredged material and waste material, in order to economically reclaim new land, sets a good example that can be used in other ports as well.     

沿海地区PHC管桩的耐久性影响因素分析

针对PHC管桩使用过程中面临的有害离子及冻融的侵蚀等问题,探讨了沿海地区PHC管桩的耐久性影响因素,分析了PHC管桩的腐蚀机理和冻融破坏作用的本质,并提出了相应的对策和防治措施,以期提高PHC管桩耐久性。     

吹填造陆技术在天津滨海新区的应用

针对滨海海相淤泥吹填造陆已成为天津地区进行土地开发的重要技术手段,从天津地区海相淤泥的吹填特性、资料储量、环保效益、吹填工艺及吹填淤泥的软基处理技术等方面介绍了吹填淤泥填海造陆技术在天津地区的应用情况.     

Concentration and size distribution of bioaerosols in an outdoor environment in the Qingdao coastal region

Bioaerosol particles in the atmosphere were collected from the coastal region of Qingdao from Jul. 2009 to Jun. 2010. The concentrations of microorganisms (including culturable, nonculturable, terrestrial and marine microorganisms) were measured. Average concentrations of airborne terrestrial bacteria, marine bacteria, terrestrial fungi, marine fungi and total bioaerosol were in the ranges of 33-664 CFU/m³, 63-815 CFU/m³, 2-777 CFU/m³, 66-1128 CFU/m³ and 85,015-166,094 Cells/m³, respectively. The nonculturable microbes accounted for 99.13% of the total microbes. In addition, there were more culturable marine microbes than culturable terrestrial microbes, and more airborne fungi than bacteria. The concentration of airborne bacteria showed a skewed distribution pattern, while unimodal size distributions were observed for the concentrations of fungi and total microbes. The airborne microbes mainly existed in > 2.1 μm coarse particles. Pearson correlation analysis between the concentrations and meteorological parameters showed that the meteorological parameters had different effects on different kinds of microbes. Sandstorms increased the concentrations of both culturable microbes and total microbes in the bioaerosol.