谈市政排水管道工程改造设计及养护管理

目前我国大部分城市的地下排水管线接近老化,很多城市也意识到这个问题,一场全国排水管网全面调查改造设计已迫在眉睫。本文主要分析介绍了一下市政排水管网改造设计方案及养护措施等。     

对高层建筑给排水施工问题的若干探讨

当前,建筑给排水与人们的生活息息相关,优质的安装施工质量和科学的管理是保障管网系统高效安全运行的必要条件,为了满足给排水工程施工技术要求,提高施工质量,需要施工人员不断学习,提高自身的技术素质,才能确保施工的安全、质量、稳定、灵活性,满足民用建筑给排水的发展需要。为此,本文针对高层建筑的给排水系统的多个方面进行了简要的探讨。     

Cost-effectiveness analysis of standalone trabecular micro-bypass stents in patients with mild-to-moderate open-angle glaucoma in Canada

Objectives: To estimate the cost-utility of two trabecular micro-bypass stents (TBS) implantation vs standard of care (SOC) in patients with mild-to-moderate open-angle glaucoma (OAG) in the Canadian healthcare setting.

Methods: The deterioration in visual field (VF) defect over a 15-year time horizon was tracked using a Markov model with Hodapp-Parrish-Anderson stages of glaucoma (mild, moderate, advanced, severe/blind) and death as health states. Meta-analyses of randomized clinical trials were conducted to estimate the pooled reduction in intraocular pressure (IOP) and medication use due to TBS and SOC. The rate of decline in VF loss was adjusted by the extent of IOP reduction to estimate transition probabilities. Healthcare resource utilization, unit costs (2017 CAD), and progression-related utility scores were obtained by literature review, and medication costs with wastage were obtained from IMS Brogan PharmaStat. The impact of parameter and methodological uncertainty on costs and quality-adjusted life years (QALYs) was examined using probabilistic and 1-way sensitivity analyses.

Results: The meta-analysis showed an additional reduction of 1.13 medications/patient and an additional decrease in IOP of –1.10?mmHg at 36?months favoring TBS. TBS strongly dominated medication alone, due to higher improvement in quality-of-life (0.068 QALYs), fewer blind eyes (–0.0031), and a decrease in total healthcare costs of C$2,908.3 per patient over the time horizon (C$9,394.1 TBS vs C$12,302.4 medication alone). Sensitivity analyses showed that results were robust to the uncertainties in model inputs and assumptions. Time-to-dominance was 44?months (3.7?years).

Conclusions: The TBS procedure was cost-effective over SOC in a 15-year time horizon, with quality-of-life gains.     

基于涌出量预测的矿井自动排水系统设计

针对矿井自动化排水问题,提出了基于涌水量预测的矿井自动化排水控制方法。首先构建自动化排水网络,然后采用历史数据对矿井涌水量进行预测,利用预测结果确定投入工作的水泵数量。在MATLAB中仿真表明,该方法具有较好的适应性。     

RPD-180CBR多功能快速钻机在引汉济渭秦岭输水隧洞中的应用

本文依托引汉济渭秦岭出口工程实例,简述了在云母石英片岩及黑河水库影响区等不良水文地质段使用矿研RPD-180CBR多功能快速钻机进行超前水平钻探和超前放水,在直观探取前方地质情况的同时使掌子面形成少水环境,增加了掌子面围岩自稳性,确保了掌子面施工安全,取得了良好的施工进度,为类似工程提供了参考经验。     

上保护层开采后的煤层群应力变化研究

对贵州某煤与瓦斯突出矿井建立FLAC3D模型进行分析,沿走向在中间部分的应力减小,在开切眼和收作线的应力增大;沿走向方向,煤层开挖到100m和150m的时候煤层的卸压范围最大,开挖200m时候卸压区范围有所减小。通过对上保护层开采后的煤层群应力变化进行研究,可以更好的确定保护层保护范围。     

潮州供水枢纽电站渗漏排水系统自动控制设计

文章介绍了潮州供水枢纽工程及渗漏排水系统组成,对现地控制单元、软启动器、测量元件、控制方式、控制流程等自动控制设计进行了阐述,最后简要介绍了渗漏排水系统运行情况。     

真空预压法加固软土地基技术在横琴湾酒店工程中的应用

真空预压法加固软土地基是近年来在软土地基处理中比较常用的方法。在新建的横琴湾酒店工程中,软土地基采用了真空预压法加固施工。针对真空预压法加固软土地基施工的特点和难点,综合介绍了真空预压施工中塑料排水板、泥浆搅拌墙、真空预压施工以及加固过程监测等操作要点和在施工过程中容易出现的问题及处理方法,为类似的软地地基处理起到一定的借鉴作用。     

成功穿越榆林煤矿斜井流砂层的创新工艺和实施方案

榆林煤矿在井筒施工工程中遇到流砂层,且砂层涌水量大,造成各井筒涌水溃沙,给井筒施工带来很大困难,多次发生井筒冒顶和淹井情况,本文通过对施工困难的全面分析,提出了合理可行的解决方案,并且成功穿越了流砂层,为国内建井穿越流砂层开辟了新的途径。     

试分析建筑工程给排水施工中存在的问题与对策

本文通过对建筑工程给排水施工中存在的一些问题进行分析,提出与之相应的对策措施,以保证整个建筑工程的施工质量。