UPVC管在建筑物中应用的几点体会

对本院小办公 广济桥新五栋住宅施工中出现ＵＰＶＣ管的施工质量问题进行了归纳，对认睦把握住ＵＰＶＣ排水管的特点，进一步提高施工质量作了阐述。     

UPVC排水管的性能及安装方法

硬聚氯乙烯排水管是一种新型的绿色环保建筑材料，它具有管材轻、施工方便、安装效率高、外观美观、耐腐蚀、耐老化、水流阻力小、通水能力强以及工程造价低等诸多优点，因此，近几年来硬聚 烯排沙顺全国普及应用。但由于一些施工人员对其工艺要求不熟悉，带来了一些质量问题，本文ＵＰＶＣ排水管的特性，并从管道选材、支承、伸缩、防漏、降噪、耐热、防火和防水封等方面阐述了ＵＰＶＣ排水管的安装要点。     

硬质聚氯乙烯（UPVC）塑料管用于建筑排水中的几个问题

近年来硬聚氯乙烯排水管正在我国迅速推广使用，但因多数施工人员对其安装工艺要求尚不熟悉，也带来了一些质量问题。作者在此文中介绍了安装时如何正确处理ＵＰＶＣ排水管伸缩，固定，连接，噪音消减问题的经验。     

住宅建筑应用UPVC上下水管的技术经济分析

ＵＰＶＣ上、下水管安装方便、经久耐用、造形美观、价格低廉，是住宅建筑使用的传统上下水管的替代品。     

利用AUTOLISP提高CAD制图水平

本文就ＣＡＤ制图过程中碰到的一些问题，主要叙述如何利用ＡＵＴＯＬＩＳＰ语言来解决三个问题：ＰＬＩＮＥ线变线宽；未汉化版ＡＵＴＯＣＡＤ的输入汉字方法；改变字符大小，从而了熟练使用ＡＵＴＯＬＩＳＰ可以提高ＣＡＤ制图水平。     

河北矿资源第二轮远景区划表明我省金、银、铜、铅、锌资源潜力大

河北矿资源第二轮远景区划表明我省金、银、铜、铅、锌资源潜力大ＨＵＧＥＰＯＴＥＮＴＩＡＬＲＥＳＯＵＲＣＥＳＯＦＧＯＬＤ，ＳＩＬＶＥＲ，ＣＯＰＰＥＲ，ＬＥＡＤＡＮＤＺＩＮＣＩＮＨＥＢＥＩＰＲＯＶＩＮＣＥＡＣＣＯＲＤＩＮＧＴＯ＂ＲＥＰＯＲＴＡＢＯＵＴＴＨＥ...     

应用人工智能技术提高连铸坯直接热装置

随着ＬＴＶ钢公司克利夫兰厂设计并实现了直接热装置设备（ＤＨＣＣ），需要进行系统开发以保持，完整的初始计划编制和跟踪操作，这套新的ＤＨＣＣ设备从１９９３年９月开始运行，目标是使直接热装轧制产品至少达到８０％。在这篇论文中讨论的ＤＨＣＣ中有问题板坯的实时再应用系统对达到直接热装目标和ＤＨＣＣ热轧机的最大生产量是必要的。这个系统是ＬＴＶ钢公司和ＩＢＭ公司共同开发的克利无兰操作管理设计和程序系统（ＣＯＭＰ     

以集约方式加快发展连铸 加速冶金工业增长方式的转变──在第六次全国连铸工作会议上的书面讲话

以集约方式加快发展连铸加速冶金工业增长方式的转变──在第六次全国连铸工作会议上的书面讲话刘淇（冶金工业部）ＳＰＥＥＤＵＰＴＨＥＤＥＶＥＬＯＰＭＥＮＴＯＦＣＯＮＴＩＮＵＯＵＳＣＡＳＴＩＮＧＴＥＣＨＮＯＬＯＧＹＩＮＴＨＥＩＮＴＥＮＳＩＶＥＷＡＹＡＮＤＱＵ...     

PVC卷材屋面防水工程质量控制

介绍了从构造设计，材料选用到精心施工等各环节采取措施控制ＰＶＣ卷材屋面工程质量，以确保其不渗漏和延长使用年限。     

二次炼钢钢水加热技术及应用

对国内外二次炼钢中所应用的钢水加热技术，如利用化不原理加热的ＲＨ－ＯＢ／ＰＢ，ＲＨ－ＫＴＢ，ＣＡＳ－ＯＢ，ＶＯＤ／ＶＯＨ，ＩＲ－ＵＴ等，利用电加热的ＬＦ，ＶＡＤ，直流电弧加热，感应加热，等离子体加热等；和其它如电渣加热，燃料－氧加热等技术及其实际应用效果作了较全面的介绍了，作者针对攀钢的实际情况提出了建议。     

钢带增强聚乙烯螺旋波纹排水管的设计与应用

钢带增强聚乙烯螺旋波纹管作为一种新型的排水管道,具有良好的使用性能,但在设计、孑包工上有着不同于其它排水管材的特殊要求。本文主要介绍钢带增强聚乙烯螺旋波纹排水管道的特性与设计要点和施工注意事项。     

塑料管在市政排水工程中的应用前景

结合塑料排水管道的特性，阐述了塑料管在市政排水工程中的发展前景，对今后塑料管在市政排水工程中的应用提出了看法。     

Development of Experimental Test Setup to Evaluate Abrasion Characteristics of Drainage Pipes

The longevity of drainage pipes is dependent on the material properties of the pipe, the surrounding load, the abrasive characteristics of the effluent, and the frequency, velocity, and quantity of the effluent that flows through the pipe. Each of these parameters has impacts on the age-related abrasive decrease in the wall thickness of the drainage pipe. Traditionally, the rotating pipe test is used to assess the vulnerability of drainage pipes to abrasion. To simulate more realistically the natural environment of drainage pipes, we designed an abrasion test that keeps the drainage pipe at variable slope with respect to the horizontal and continuously pumps abrasive slurry through the pipe for 30?days. The time dependent change in wall thickness of a cellulose fiber reinforced cement pipe was simultaneously compared to the change in wall thickness of a steel-reinforced concrete pipe. The wall thickness of the fiber reinforced cement pipe decreased approximately 5 times faster than the thickness of the steel-reinforced cement pipe.     

水厂含油排水处理系统的改造

宝钢中央水处理厂含油排水处理系统于１９８５年建成投运，由于设计、设备上的一些问题，经常影响正常生产运行。针对存在的这些问题，采取了加设导流板、超越管、改造排泥泵等措施。从而使该系统更趋于合理，确保了安全稳定运行，减少了茨耗。     

Hydraulic Deterioration Models for Storm-Water Drainage Pipes: Ordered Probit versus Probabilistic Neural Network

A decrease in discharge capacity of storm-water drainage pipes is the result of the so-called hydraulic deterioration which reduces the cross sectional area of pipes and increases the pipe roughness. Hydraulic deterioration is caused by tree root intrusion, sediment accumulation, and encrustation, and is affected by many influential factors such as pipe size and pipe location. Predicting hydraulic deterioration is important for effective management of drainage pipes. An ordered probit deterioration model (OPDM) and a probabilistic neural network deterioration model (PNNDM) were developed in this study using the influential factors as model inputs and the hydraulic condition as model output. Their predictive performances were compared against each other using a case study from Melbourne, Australia with a sample of 417 storm-water drainage pipes subjected to closed circuit television inspection. The results show that the PNNDM is more suitable for predicting the hydraulic deterioration and outperforms the OPDM. Several input factors such as pipe size and pipe age are found significant to the hydraulic deterioration.     

Effects of Duct Types and Emulsifiable Oils on Bond and Friction Losses in Posttensioned Concrete

Emulsifiable oils are often used in posttensioned construction to reduce friction losses and provide temporary corrosion protection for tendons prior to grouting. This paper addresses the effects of two emulsifiable oils and three duct types on bond and friction losses. Bond test results indicate that corrugated galvanized steel ducts provide better anchorage than corrugated HDPE ducts. Rigid steel pipes performed poorly because of failure at the duct-concrete or grout-duct interface. Bond test results also indicate that the ultimate strength of posttensioned specimens with oiled tendons is similar to or better than the ultimate strength of specimens with unoiled tendons. However, specimens with oiled tendons experienced greater slip at a given load than specimens with unoiled tendons. Friction test results indicate that current recommended design values for the coefficient of friction for steel pipes and galvanized ducts are accurate. However, the measured coefficient for HDPE ducts is significantly less than the AASHTO-recommended value. Friction tests also indicate that lubrication of the tendon reduces the friction coefficient by 15% in rigid steel pipes and HDPE ducts if stressing occurs while the oil is fresh.     

Slab-on-Grade versus Framed Slab

This paper presents comprehensive and practical engineering review (not mathematics or computer science paper) of the observed behavior of the two types of slabs that have been used for the bottom floor slabs, at grade and underground, of buildings in the United States and overseas. The typical design of the slab-on-grade (SOG) built in the United States is described. The design requires only nominal reinforcing steel, but modern day design also requires ground preparation and improvement as necessary, including underslab perforated drainage pipe network embedded in the granular subbase, riser pipes, and a series of pumps. Sealing at all slab isolation joints and waterproofing membrane or water barrier system are provided for water tightness. The framed slab is supported directly on the building framing and on the building foundation. The design can accommodate the soil and underground water pressure and in itself is watertight as the slab is cast monolithically with the structural walls and footings. The behavior of the SOG depends so much on the behavior (soil properties) of the soil strata on which the slab is resting on. It is sensitive to the variation of the soil conditions at and around building foundations, leading to uneven bumpy and cracked slab and leaking basement. These were demonstrated in the report of short- and long-term performances of various projects in Thailand and United States in the past 25 years. The paper refers to various analysis and design techniques that may be used to improve the design of both the SOG and the framed slab for serviceability and economy. It is concluded that both types of slabs may be selected to suit the functions and serviceability requirements of the buildings. The SOG requires less concrete and reinforcement than those for the framed slab counterpart, but when all other factors are considered including additional underslab drainage and pump system, operating, and long-term performance and maintenance, the overall costs of both slabs may not be far apart, yet the performance and integrity of the framed slab will certainly be superior.     

Behavior of Buried Flexible Pipe under High Fills and Design Implications

The existing design guidelines for buried flexible pipes are limited to depth up to 10?m. The increasing use of difficult terrains for infrastructure, landfills, and residential and industrial developments has prompted installation of drainage pipelines under 20–30?m high fills. This paper presents the behavior of an instrumented flexible pipe buried under a 47.1?m deep fill. For filling above 20?m, the measured vertical stress above the pipe exhibited a concave distribution, corresponding to 90 and 110% of the average vertical pressure at the center and edges of the pipe, respectively. The measured results suggest that a triangular lateral pressure distribution can lead to overly conservative and uneconomical results for high fills while Spangler’s analysis is unconservative. Based on the measured results, a revised vertical and lateral earth pressure diagram was proposed for the design of flexible pipe under high fills >20?m. This paper proposes closed-form analyses for estimating the moments and displacements of the pipe subjected to high fill earth pressures. These closed-form solutions agree well with the measured pipe displacements and strains.     

NG-240/9.8-M3型燃气锅炉定期排污系统改造

NG-240/9.8-M3型锅炉原连续排污系统管路、弯管和三通泄漏频次高,采用扩容厚壁小联箱进行替换改造后,成功解决了连排系统泄漏频次高的问题.提升了锅炉的运行效率,达到节能降耗、安全检修、提升效益的目的.     

Experimental Study of a Right-Angled End Junction between a Pipe and an Open Channel

This paper presents an experimental study of a junction between a closed conduit and an open channel. This study was undertaken to explore hydraulic properties of outlets of subsurface drainage or sewage networks into an open air stream during flood events. Experiments were conducted in a laboratory flume, with a main rectangular channel joined at right angle to a lateral circular pipe. Both branches were supplied with independent flow rates and downstream water level was controlled by an adjustable weir. Several flow patterns were identified, combining free-surface and pressurized flows. Transitions between these flow patterns, as well as changes in water level or energy, in response to the modifications of experimental variables, were studied and could be linked to known properties of single channels, single pipes, and homogeneous junctions. Transitions between free-surface and pressurized pipe flow appeared to be strongly dependent on the whole set of experimental variables and the pipe longitudinal slope. This work contributes to a better knowledge of hydraulic and hydrologic key processes for point source discharging.