提高混凝土设备基础预埋螺栓合格率施工技术

某40万 t/a硫磺制酸工程干吸、焚硫转化工段,大量的螺栓预埋施工采用螺栓——钢筋——模板一体化的加固技术,成功地提高了混凝土设备基础预埋螺栓的合格率(合格率达95％)。     

浅谈立体仓库钢结构预埋地脚螺栓控制技术

为了满足钢结构立体仓库的钢柱安装精度要求,施工现场的质量保证体系的建立、到原材料的控制、技术准备、针对地脚螺栓预埋容易发生的问题开始,制定多种措施,确保地脚螺栓位置准确。从而保证了预埋螺栓的准确性,达到了设计及施工质量验收规范要求。     

矿山法隧道内嵌预埋槽道技术应用中的问题与措施

矿山法地铁隧道断面小,二衬台车上安装预埋槽道空间狭窄,不易施工;地铁隧道管线众多,预埋槽道纵向间距较为密集且锚杆较多,与钢筋极易冲突;预埋槽道安装空间狭窄,不易检查其施工质量,容易引发槽道安装质量等一系列问题。内嵌式预埋槽道技术在矿山法地铁隧道中的应用,最突出的问题是预埋槽道与钢筋的碰撞。具体办法：（1）首先解决相对位置问题;（2）加强矮边墙施工缝处钢筋精度的控制。     

HORO卧式辊磨基础浇注介绍

２０００年我公司从法国FCB公司引进HORO卧式辊磨，该磨的基础浇注有些特殊要求。在此将其部分要求特点介绍给大家，以供参考。１地脚螺栓的预埋形式卧式辊磨的底板和底座为一体。本体有５３根地脚螺栓，其中M９０×２６１０共３６根，用于固定磨辊两端压臂支座；M６０×１９３０螺栓４根，M４２×１３３５螺栓１３根，用于固定磨机底座。在设备安装前，应将全部地脚螺栓预埋在基础内，并要求螺栓之间的位置公差为±１mm。为此，我厂根据技术要求，用钢板及工字钢制作了预埋螺栓模板，见图１。钢板用于固定地脚螺栓，工字钢作支架，用于…     

LDPE超高压系统基础及防爆墙施工技术难点解决方案

通过工程施工实例,介绍了高压低密度聚乙烯(LDPE)装置超高压系统基础及防爆墙施工技术难点的创新方案,提出了超高压系统单设测量控制网,密集重型管墩联浇底板、后浇墩柱,压缩机基础预埋设施刚性固定、施工缝凸台、配筋研究,防爆墙施工缝设置、预埋钢板盒、墙体边支边浇、模架稳定,以及大体积混凝土温控、自创"不损伤模板穿墙螺栓"等创新技术措施,并提出编制行业技术标准的建议。     

对焦炉推焦车轨道的改造

山西焦化股份有限公司1#、2#焦炉投产以来，推焦车基本属于全天候运行状态，每日来回运行次数不下110趟，而推焦车作用于轨道的压力一个为正压力，另一个为侧推力。长期运行以来，整个推焦轨道基础高低不平、溃烂，甚至部分基础下沉严重，造成基础预埋板与预埋钢筋脱焊，     

钢筋混凝土沉井支模及封底

本文主要阐述了圆形钢筋砼沉井施工中采用钢丝绳捆绑支模的工艺特点和“预埋管排水、堵塞两次封底法”的施工工艺原理。     

快速烧成结晶釉关键技术的研究

笔者利用正交试验法研究釉料配方,缩短了结晶釉的烧成时间;通过预埋晶种,缩短保温时间,最终确定出最佳工艺制度。     

设备基础预埋螺栓孔施工方法

工业建筑中,各种设备基础预埋螺栓孔,量大且种类复杂,为保证基础上各种设备的正常运行起到非常重要的作用.通过工程实践,在基础预留设备螺栓孔的留设方法与技术进行一定的分析,在施工中进行不同的选择,以保证施工质量.     

预制装配式混凝土结构预埋吊装技术研究

在预制装配式混凝土结构中,预埋吊装技术是吊装施工与安全装配的重点环节,并且预埋吊装技术的选用对于构造物吊装设计和施工工艺至关重要。本文探讨了装配式混凝土结构的预埋吊装技术的发展历程和现状,并阐述了我国CABR预埋吊装技术的构造方案。通过试验验证表明:CABR预埋吊装技术不仅满足设计要求,而且性能优异,质量可靠,具有良好的发展前景。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。