黄山市新安江钢坝闸拐臂及底轴管制造工艺浅析

黄山市新安江钢坝闸是目前国内总跨度最大的钢坝闸,全长257m。钢坝闸是近年来逐渐兴起的一种新型景观闸,因其具有闸门开度无级可调、操作方便、启闭灵活、方便调度、工作隐蔽利于形成城市景观的特点,越来越多地用于城市水利枢纽。钢坝闸闸门为平板钢闸门,采用底轴驱动的方式,闸门在开启状态时,水流流过闸门可形成瀑布景观。钢坝闸的拐臂和底轴管作为主要受力构件之一,结构、工艺复杂,是制造过程中的技术难点。文章着重介绍拐臂和底轴管的制造工艺,以期对同行有所帮助。     

软土地基上大跨度底轴驱动翻板闸基础不均匀沉降处理

底轴驱动翻板闸可调度性好,环境融合度高,广泛应用于城市水系工程中,但软土地基上大跨度底轴驱动翻板闸闸基稳定应力分析和基础处理相关研究较少。该文以晋安湖工程3号闸为实例,通过闸基稳定应力分析,从伸缩段长度控制和基础处理设计两方面调整闸基应力不均匀系数,解决了深厚软土地基上大跨度底轴驱动翻板闸基础不均匀沉降问题。     

黄山市新安江钢坝闸拐臂及底轴管制造工艺浅析

黄山市新安江钢坝闸是目前国内总跨度最大的钢坝闸,全长257m。钢坝闸是近年来逐渐兴起的一种新型景观闸,因其具有闸门开度无级可调、操作方便、启闭灵活、方便调度、工作隐蔽利于形成城市景观的特点,越来越多地用于城市水利枢纽。钢坝闸闸门为平板钢闸门,采用底轴驱动的方式,闸门在开启状态时,水流流过闸门可形成瀑布景观。钢坝闸的拐臂和底轴管作为主要受力构件之一,结构、工艺复杂,是制造过程中的技术难点。     

郑东新区水系大跨度控制闸的闸型研究

介绍了液压上翻转式闸门、组合式液压下翻板闸门和液压下翻转式闸门等新型闸门的布置方案。结合郑东新区实际情况,确定新区CBD如意湖水系与金水河、熊耳河和东风渠段3座控制闸采用闸桥结合液压上翻转闸门,宽度均为104 m,主要由13扇闸门单元、1套底坎埋件、2套主液压泵站、2套电气控制系统和6套锁定液压泵站组成。如意湖出口控制闸推荐气动盾形闸门布置方案。     

节制闸金属结构底轴焊接技术特点及要求

新建节制闸共设5孔工作闸门,设计参数32.80 m×3.30 m-4.50 m（宽×高-挡水水头）,底槛高程65.00 m。钢坝闸闸门为平板钢闸门,采用底轴驱动的方式。底轴作为主要受力构件之一,直径大、结构工艺复杂。文章着重介绍底轴的焊接质量技术特点及要求。     

新担涌东闸闸门形式的设计布置

文章介绍了广州市黄埔区新担涌水闸工程东闸相关金属结构设计及布置情况,重点阐述了底轴驱动下卧式闸门的布置特点。     

新担涌东闸闸门形式的设计布置

文章介绍了广州市黄埔区新担涌水闸工程东闸相关金属结构设计及布置情况,重点阐述了底轴驱动下卧式闸门的布置特点。     

一种防淤型底轴驱动式翻板闸门

介绍了一种新型翻板闸门——防淤型底轴驱动式翻板闸门,此闸门在门叶底部设置了节流装置,利用闸内外水位差,在闸门底轴与底坎间的间隙中形成动能足够的水流对门库进行冲刷,这种冲淤措施不但节能且有效解决底轴驱动式翻板闸门的门库淤积问题。     

唐山环城水系陡河钢坝设计简介

分析了钢坝的特点,针对钢坝的设计工况,从钢坝的总体布置、底轴设计措施及启闭机控制等方面分别进行阐述。在底轴设计措施中,采取了对闸底板不均匀沉陷的控制和轴承结构采用新型材料的方法,在启闭机控制中,采取了现地手动和现地自动两种方式。     

马家沟河整治液压翻转拦河闸设计

在马家沟河工程整治中,市区修筑溢流壅水梯级13座,液压翻转拦河闸为溢流堰的第13级,在河口桥下50m处,为钢筋混凝土结构液压翻转门拦河闸.其特点是造型简洁、新颖,属非常规型闸.闸门迎水面以钢臂铰接于闸底板上,背水面铰连结于液压构件,闸门启闭由右岸控制室液压系统操作,可单孔、双孔和任意开度启闭闸门,使闸门处于挡水和放水状态.     

地下厂房施工过程的三维非线性数值模拟分析

根据冗各电站地下厂房开挖支护的施工顺序,以隐式杆单元模拟锚杆,以壳单元模拟混凝土喷层,采用三维非线性有限元技术,对洞室群的开挖支护动态过程进行了模拟计算。通过三维非线性有限元计算分析得到:洞室群动态开挖过程中围岩应力变形的分布规律,围岩塑性区的发展规律,锚杆受力变化情况。计算结果表明:整个开挖过程中,洞周围岩位移变化规律正常,量值较小,塑性区主要分布在洞室周边,围岩稳定性较好;但在洞室交叉口处围岩的变形较大,出现较大范围的塑性区,在此基础上提出了支护措施优化方案,并对优化方案的效果进行了评价。     

Evaluation of freshwater mussel relocation as a conservation and management strategy

The relocation of unionacean mussels is commonly used as a conservation and management tool in large rivers and streams. Relocation has been used to recolonize areas where mussel populations have been eliminated by prior pollution events, to remove mussels from construction zones and to re-establish populations of endangered species. More recently, relocation has been used to protect native freshwater mussels from colonization by the exotic zebra mussel Dreissena polymorpha. We conducted a literature review of mussel relocations and evaluated their relative success as a conservation and management strategy. We found that 43% of all relocations were conducted because of construction projects that were forced to comply with the Endangered Species Act 1973 and that only 16% were monitored for five or more consecutive years. Most (43%) relocation projects were conducted from July to September, presumably a period when reproductive stress is relatively low for most species and the metabolic rate is sufficient for reburrowing in the substrate. The mortality of relocated mussels was unreported in 27% of projects; reported mortality varied widely among projects and species and was difficult to assess. The mean mortality of relocated mussels was 49% based on an average recovery rate of 43%. There is little guidance on the methods for relocation or for monitoring the subsequent long-term status of relocated mussels. Based on this evaluation, research is needed to develop criteria for selecting a suitable relocation site and to establish appropriate methods and guidelines for conducting relocation projects.     

基于模型试验的河床砂砾石层基本特性研究

为了经济可靠地确定深厚覆盖层的基本特性参数,以大渡河双江口水电站坝基河床砂砾石层基本特性研究为工程背景,进行大尺寸模型试验,研究河床砂砾石层的旁压模量和动探击数随密度、级配以及上覆压力的变化规律。根据室内模型试验结果,结合现场旁压试验及钻孔试验成果,推断出坝址区河床砂砾石相关层位的密度,并依此进行砂砾石室内力学试验,获得设计所需力学参数。研究成果可为深厚覆盖层基本特性测试提供新的方法。     

基于BP神经网络-马尔科夫链模型的隧道围岩位移预测

在隧道工程施工中,围岩位移预测起着很重要的作用。将BP神经网络-马尔科夫链模型引入到隧道围岩位移预测中来,通过对训练样本的学习,利用BP神经网络实现了对位移时间序列的滚动预测,同时得到了实测值与预测值的相对误差;在此基础上利用马尔科夫链对相对误差进行修正,有效地提高了预测结果的精度。并将该模型应用于某公路隧道拱顶下沉位移时序预测中,结果表明该模型具有精度高、科学可靠的特点,为隧道围岩变形的预测提供了新的途径。     

Short communication. Pipelines as a refuge for freshwater snails

In the lower River Murray, Australia, populations of gastropods have declined markedly over the past 40 years. Of the native fauna of about 18 species, only the ancylid Ferrissia petterdi remains common (but in patches), and another five species feature in sporadic local resurgences. Until recently the viviparid Notopala was thought to be extinct. The introduced physid Physa acuta is widespread, but in low numbers. The decline probably is associated with flow regulation, high turbidity and the introduction of common carp. Snail populations have persisted, however, in irrigation pipelines fed from the river, where they periodically cause blockages. This paper reports the discovery of the only known populaion of Notopala hanleyi in a pipeline where the inner wall accumulates microbial and other organic matter, providing high quality food for snails. In the Murray before regulation most of the periphytic biomass was probably microbial, as fluctuating water levels would have maintained littoral communities in a highly productive, early state of succession his postulated that, by stabilizing seasonal water levels, regulation has promoted the production of filamentous green algae, an inferior food source, and so displaced snail populations from the open aquatic environment.     

浙江省水域调查录入系统的设计和应用

浙江省水域调查录入系统将调查数据与电子地图相整合,对分类水域数据进行统计计算,并对输入数据进行合理性和完整性检查,得到调查范围内现有水域的详细数据,实现了水域调查数据输入、计算、统计和查询的数字化管理,提高了工作效率和工作质量,为各地下阶段水域保护规划编制和水域管理工作提供了数据支持。对该系统的设计原则、功能和技术设计等作了介绍。     

基于CT-连续加荷水泥乳化沥青混凝土细观损伤规律研究

利用CT技术对水泥乳化沥青混凝土的细观损伤过程进行实时扫描观测,获得了混凝土试件在连续加荷下的CT图像。通过采用直观分析法、CT数分析法、CT数与损伤变量关系3种方法分析表明,水泥乳化沥青混凝土的破坏过程可分为压密、扩容、裂纹扩展、破坏4个阶段,同时混凝土在受压过程中具有韧性,在极限荷载之前各断面处于压密和微扩容的强化阶段,极限荷载之后混凝土从损伤到破坏发展比较平稳。     

Automated system for removal and pneumatic transport of fly ash from electric precipitator hoppers

A system for removal and pneumatic transport of fly ash is examined, in which air pulses act on batches (pistons) of ash formed in a duct. Studies are made of the effect of several physical parameters on the force required to displace a piston of ash and these serve as a basis for choosing a system for removal and pneumatic transport of ash simultaneously from several hoppers of an electric precipitator. This makes it possible to separate the ash particles according to size without introducing additional components. Formulas are given for calculating the structural and dynamic parameters of this system and measurements of indirect dynamic parameters are used to calculate the input-output characteristics of the system. In order to optimize the system, configurations for summing several ducts into a single transport duct for pneumatic ash transport are proposed. Some variants of dry ash utilization and the advantages of producing of size-separated particles are considered. __________ Translated from élektricheskie Stantsii, No. 2, pp. 26–30 (2008).     

The flood pulse advantage and the restoration of river-floodplain systems

The ‘flood pulse advantage’ is the amount by which fish yield per unit mean water area is increased by a natural, predictable flood pulse. Evidence for this increase is presented from tropical and temperate fisheries. It is argued that increasing multispecies fish yield by restoring the natural hydrological regime is consistent with increasing production of other trophic levels and with restoration from ecological and aesthetic viewpoints. When applied to a river-floodplain system, this restoration would provide a large, self-sustaining potential for recreation, commercial exploitation, and flood control. An interim ‘natural flood pulse’ restoration approach is proposed for systems modified for navigation. This approach approximates the natural hydrological regime in a river reach and is intended as a first step in the long process of restoring the watershed.     

浅谈天湖水电站水轮机运行故障及处理措施

简述天湖水电站投运以来各种故障的表现形式，分析其原因，提出了相应的处理方法及措施，并对合理利用国内外设备提出建议。